ALBERT

Description / Table of Contents: Starting from a more general discussion of mechanisms controlling organic carbon deposition in marine environments and indicators useful for paleoenvironmental reconstructions, this study concentrates on detailed organic-geochemical and sedimentological investigations of late Cenozoic deep-sea sediments from (1) the Baffin Bay and the Labrador Sea (ODP-Leg 105), (2) the upwelling area off Northwest Africa (ODP-Leg 108), and (3) the Sea of Japan (ODP-Leg 128). Of major interest are shortas well as long-term changes in organic carbon accumulation during the past 20 m.y. As shown in the data from ODP-Legs 105, 108, and 128, sediments characterized by similar high organic carbon contents can be deposited in very different environments. Thus, simple total organic carbon data do not allow (i) to distinguish between different factors controlling organic carbon enrichment and (ii) to reconstruct the depositional history of these sediments. Data on both quantity and composition of the organic matter, however, provide important informations about the depositional environment and allow detailed reconstructions of the evolution of paleoclimate, paleoceanic circulation, and paleoproductivity in these areas. The results have significant implications for quantitative models of the mechanisms of climatic change. Furthermore, the data may also help to explain the formation of fossil black shales, i.e., hydrocarbon source rocks. (1) BAFFIN BAY AND LABRADOR SEA The Miocene to Quaternary sediments at Baffin Bay Site 645 are characterized by relatively high organic carbon contents, most of which range from 0.5% to almost 3%. This organic carbon enrichment was mainly controlled by increased supply .of terrigenous organic matter throughout the entire time interval. Two distinct maxima were identified: (i) a middle Miocene maximum, possibly reflecting a dense vegetation cover and fluvial sediment supply from adjacent islands, that decreased during late Miocene and early Pliocene time because of expansion of tundra vegetation due to global climatic deterioration; (ii) a late Pliocene-Pleistocene maximum possibly caused by glacial erosion and meltwater outwash. Significant amounts of marine organic carbon were accumulated in western Baffin Bay during middle Miocene time, indicating higher surface-water productivity (up to about 150 gC m -2 y-l) resulted from the inflow of cold and nutrient-rich Arctic water masses. The decrease in average surface-water productivity to values similar to those of the modern Baffin Bay was recorded during the late Miocene and was probably caused by the development of a seasonal sea-ice cover. At Labrador Sea Sites 646 and 647, organic carbon contents are low varying between 0.10% and 0.75%; the origin of most of the organic matter probably is marine. A major increase in organic carbon accumulation at Site 646 at about 7.2 Ma may indicate increased surface-water productivity triggered by the onset of the cold East-Greeniand Current system. Near 2.4 Ma, i.e., parallel to the development of major Northern Hemisphere Glaciation, accumulation rates of both organic carbon and biogenic opal decreased, suggesting a reduced surface-water productivity because of the development of dosed seasonal sea-ice cover in the northern Labrador Sea. The influence of varying sea-ice cover on surface-water productivity is also documented in the short-term glacial/interglacial fluctuations in organic carbon deposition at Sites 646 and 647. (2) UPWELLING AREAS OFF NORTHWEST AFRICA The upper Pliocene-Quaternary sediments at coastal-upwelling Site 658 are characterized by high organic carbon contents of 4%; the organic matter is a mixture of marine and terrigenous material with a dominance of the marine proportion. The upper Miocene to Quaternary pelagic sediments from close-by non-upwelling Sites 657 and 659, on the other hand, display low organic carbon values of less than 0.5%. Only in turbidites and slumps occasionally intercalated at the latter two sites, high organic carbon values of up to 3% occur. The high accumulation rates of marine organic carbon recorded at Site 658 reflect the high-productivity upwelling environment. Paleoproductivity varies between 100 and 400 gC m "2 y-1 during the past 3.6 m.y. and is clearly triggered by changes in global climate. However, there is no simple relationship between climate and organic carbon supply, i.e., it is not possble to postulate that productivity was generally higher at Site 658 during glacials than during interglacials or vice versa. Changes in the relative importance between upwelling activity (which was increased during glacial intervals) and fluvial nutrient supply (which was increased during interglacial intervals) may have caused the complex productivity record at Site 658. Most of the maximum productivity values, for example, were recorded at peak interglacials and at terminations indicating the importance of local fluvial nutrient supply at Site 658. Near 0.5 Ma, a long-term decrease in paleoproductivity occurs, probably indicating a decrease in fluvial nutrient supply and/or a change in nutrient "content of the upwelled waters. The former explanation is supported by the contemporaneous decrease in terrigenous organic carbon and (river-borne) clay supply suggesting an increase in long-term aridity in the Central Sahara. At Site 660, underneath the Northern Equatorial Divergence Zone, (marine) organic carbon values of up to 1.5% were recorded in upper Pliocene-Quaternary sediments. During the last 2.5 Ma, the glacial sediments are carbonate-lean and enriched in organic carbon probably caused by the influence of a carbonate-dissolving and oxygen-poor deep-water mass. (3) SEA OF JAPAN Based on preliminary results of organic-geochemical investigations, the Miocene to Quaternary sediments from ODP-Sites 798 (Oki Ridge) and 799 (Kita-Yamato-Trough) are characterized by high organic carbon contents of up to 6%; the organic matter is a mixture between marine and terrigenous material. Dominant mechanisms controlling (marine) organic carbon enrichments are probably high-surface water productivity and increased preservations rates under anoxic deep-water conditions. In the lower Pliocene sediments at Site 798 and the Miocene to Quaternary sediments at Site 799, rapid burial of organic carbon in turbidites may have occurred episodically. Distinct cycles of dark laminated sediments with organic carbon values of more than 5% and light bioturbated to homogenous sediments with lower organic carbon contents indicate dramatic shortterm paleoceanographic variations. More detailed records of accumulation rates of marine and terrigenous organic carbon and biogenic opal as well as a detailed oxygen isotope stratigraphy are required for a more precise reconstruction of the environmental history of the Sea of Japan through late Cenozoic time.

Description / Table of Contents: Cellular growth is an important crystal growth process and offers an interesting example of natural pattern formation. The present work has been undertaken to study cellular growth, especially its pattern formation, both experimentally and numerically. In situ observations of faceted cellular growth clearly revealed cellular interactions in the array of cells. Cell tip splitting and loss of cells were observed to be the two main mechanisms for the adjustment of cell spacings during growth. For the first time, the true time-dependent faceted cellular growth has been modelled properly. The time evolution of faceted cellular growth has demonstrated the dynamical features of cellular growth processes. It was shown that the pattern formation was determined by cellular interactions in the array, either transient or persistent depending on the growth condition. The cellular structures were irregular when persistent interactions occurred, whereas relatively regular structures could be formed once the transient interactions had stopped. As a result of cellular interactions, a finite range of stable cell spacings was found under a given growth condition. Numerical experiments were carried out for k 〉 1 and k 〈 1 (where k is the solute partition coefficient), under a number of different growth conditions. It was found that these two cases were not symmetric as far as solute distribution is concerned; however the pattern formation behaviours were similar. For k 〉 1 shallow cells were retained, while for k 〈 1, the formation of liquid grooves along the cell boundary depended on the growth condition. The solute effect plays an important role in the cellular interactions in the array. The results were compared with experimental observations in thin film silicon single crystals. It is felt that a general behaviour of pattern formation is found and should be expected for other processes such as non-faceted cellular or eutectic growth. In addition, the solute flow in steady state cellular array growth was studied using the point source technique. Preliminary work was carried out to measure steady state non-faceted cell shapes. Heat flow in zone melting was studied numerically.

Description / Table of Contents: INTRODUCTION Ecometry concerns measurements and interpretation of ecological data and relationships between data. It deals with most matters involved in the scientific aspects of the representativity and information value of samples and does not, in fact, concern statistical methods. In particular, ecometry can be regarded as an approach to obtain so-called load models and load diagrammes (effect-dose-sensitivity diagrammes), which are one of the aims/final products in aquatic environmental consequence analysis (H~- kanson, 1990; all these terms will be explained later on). This publication is meant to demonstrate what can and cannot be done using ecometric approaches. It must be emphasized at the outset that the main intention here is not to provide new radioecological knowledge on how Cs-137 is dispersed in aquatic ecosystems after the Chernobyl accident and is taken up in fish, but to use Cs-137 as a type substance and pike as a biological indicator to go through methods which should also apply to other types of environmentally hazardous substances (it could just as well have been substance X in ecosystem Y). As a secondary effect, we may also learn something about Cs-137. Several terms and methods, which have not been used earlier in the aquatic environmental sciences, e.g., ecometric analysis and dynamic modelling using moderators, will be discussed and defined...

Description / Table of Contents: PREFACE Following the economical and social development of the local communities, mountain regions of temperate climates are increasingly becoming the site of valuable infrastructures and important urban and industrial settlements. As the catastrophic events of last years in the European Alps have clearly shown, the vulnerability of these territories has correspondingly increased, in terms of both property damage and losses of human life. Until recently, the hydraulic scientific community has paid little attention to mountain watersheds, except perhaps during the period if the hydropower development. Nevertheless attention was then focused on problems and methodologies somewhat different from the issues of actual environmental concern. More recently, however, hydraulic engineers have joined their colleagues from forest and rural engineering, who have traditionally dealt with erosion control in mountain areas, to bring in their own methodology, already experienced in lowland rivers. At the same time, academic people focused an interest in some phenomena, like massive transport, which is typical of mountain environment. To bring together all these contributions and to make the state of the art of the mountain river science (oropotamology) and technology, an International Workshop was called at the University of Trent (Italy), on October 1989, under the sponsorship of Fluvial Hydraulic Section of the IAHR. Three main topics have been recognized as particularly relevant from the point of view of both research and professivnal people: a) Hydrodynamics of steep channels and local scale process; b) Sediment movement and sediment training, with special emphasis on massive transport; c) Particular features of sediment transport related to non-uniform grain-size. However, as it is the case in these circumstances, the contest of several contributions often spread over more than one topic. In the following Introduction to papers, the three topics were split into 11 Sections, each one devoted to a more particular aspect recurrently addressed during the discussion. The same paper, thus, may be mentioned in different Sections of the Introduction.

Description / Table of Contents: INTRODUCTION Humic substances, comprise a class of biogenic, coloured, organic substances that are ubiquitous in soil, sediment and water. Originally, the occurrence and nature of humic substances were regarded as issues of primarily academic interest. This situation is now rapidly changing, and studies of humics have gained recognition as important contributions to environmental science. In particular it has been shown that humic substances, in several different ways can interact with biologically active substances, thereby modifying their environmental impact. Whereas the history of soil humus studies goes back to the 19th century, the awareness of aquatic humus is more recent. The brownish colour that, in many surface waters, shows the presence of substantial amounts of humic substances, was long considered to be a harmless phenomenon that did not call for detailed investigations. Hnmic waters had few known toxic effects, and the refractory character of hnmic substances indicated the they played a peripheral role in most biochemical processes. In fact, it was not until the mid 70's that aquatic humus was brought into focus in environmental science. The event trigging this was the discovery of the interaction between humic substances and chlorine used for disinfection of drinking water. Toxic substances, such as chloroform, were detected in all chlorinated waters, and humic substances were identified as the main precursors. The role of humics in the mobilization and subsequent transport of trace elements in the environment was recognized for the first time in the early 80's. This role was considered to be of particular importance in connection with geologic storage of high-level radioactive waste. In water with "normal" concentration levels of humic compounds, the speciation of e.g. the trivalent actinides, would be entirely dominated by the complexation with these agents. The topics of this conference (Session 1 - Isolation, fractionation and characterization; Session 2 - Biological and chemical transformation and degradation; Session 3 - Complex formation and interactions with solids; Session 4 - Biological activity; and session 5 Halogenation of humic substances) were selected to represent areas of current environmental interest...

Description / Table of Contents: PREFACE This book represents the first attempt in three decades to marshall out available information on the regional geology of Africa for advanced undergraduates and beginning graduate students. Geologic education in African universities is severely hampered by the lack of a textbook on African regional geology. This situation is greatly exacerbated by the inability of most African universities to purchase reference books and maintain journal subscriptions. Besides, geologic information about Africa is so widely dispersed that a balanced and comprehensive course content on Africa is beyond the routine preparation of lecture notes by university teachers. Since geology is a universal subject and Africa is one of the largest landmasses on Earth with one of the longest continuous records of Earth history, there is no doubt that geologic education in other parts of the world will benefit from a comprehensive presentation of African geologic case histories. The scope of this text also addresses the need of the professional geologist, who may require some general or background information about an unfamiliar African geologic region or age interval. Africa occupies a central position in the world's mineral raw materials trade. Because of its enormous extent and great geologic age, the diversity and size of Africa's mineral endowment is unparalleled. Africa is the leading source of gold, diamond, uranium, and dominates the world's supply of strategic minerals such as chromium, manganese, cobalt, and platinum. Consequently, African nations from Algeria to Zimbabwe depend solely on mineral exports for economic survival. The geologic factors which govern economic mineral deposits are stressed in this text. The geological history of Africa spans 3.8 billion years, a record that is unique both in duration and continuity. Few other parts of our planet match the plethora of geologic phenomena and processes that are displayed in the African continent. From the various stages of crustal evolution decipherable from the Archean of southern Africa, through the plate tectonics scenarios in the ubiquitous Late Proterozoic-Early Paleozoic Pan-African mobile belts and in the Hercynian and Alpine orogenies of northwest Africa, to the East African Rift Valley, Africa is replete with excellent examples and problems for a course on regional tectonics. Teachers of igneous and metamorphic petrology can hardly ignore Africa's anorogenic magmatism (e.g.. layered ultramafic intrusives such as the Great Dyke and the Bushveld Complex; the Tete gabbro-anorthosite pluton; alkaline complexes; basaltic volcanism), or tantalizing highgrade metamorphic terranes such as the Limpopo belt, the Namaqua mobile belt, and the Mozambique belt. From the extensive Precambrian supracrustal sequences throughout the continent with enormous thicknesses of sedimentary rocks that have hardly been deformed or metamorphosed, to the stratigraphic evolution of Africa's present-day passive continental margin, there is a complete spectrum of facies models upon which to base a course on basin analysis and stratigraphy. To maintain its integrity a course on historical geology anywhere in the world must address the theory of Continental Drift beyond invoking past continuities between West Africa and South America. Past connections between West Africa and eastern North America must equally be explored, so also connections between northeast Africa and Arabia, and the paleogeography of southern Gondwana where Africa occupied centre stage. The Precambrian fossil record, the transitions from reptiles to the earliest mammals and dinosaurs, and the evolution of Man are among Africa's unique contributions to the history of life and the story of organic evolution. Although it lies today in the tropics Africa was the theatre of the Earth's most-spectacular glaciations. Even after the scene of continental glaciation had shifted to the northern continents only lately during the Pleistocene, Africa still witnessed spectacular climatic fluctuations during the Quaternary. Certainly students of archeology and paleoanthropology cannot overlook the Quaternary paleoenvironmental record of the Olduvai Gorge in Tanzania, the Lake Turkana basin in Kenya, the Nile valley, the Sahara, and southern Africa. But since African examples have already been cited in standard geologic textbook, I have often been asked why it has become necessary to revive the idea of a full-length textbook on African geology, 30 years after this idea was abandoned by the geologic community. My simple answer, as already stated, is that the wealth of available geologic information about Africa is so enormous and fascinating, but so diffuse, that an attempt must be made to assemble and pass on this knowledge.

Description / Table of Contents: PREFACE The application of thermal analysis to earth science has a long history. This is evidenced by the extensive coverages by Mackenzie (1957, 1970), Langier-Kuzniarowa (1967), Schultze (1971), Liptay (t973), Smykatz- Kloss (1974), Todor (1976) and Heide (1982). The chief thermal method has been differential thermal analysis (DTA). Additionally, thermogravimetry (TG; Duval, 1963; Keattch, 1969; Earnest, 1988) and thermodilatometry (Schomburg & Strörr, 1984) have gained some importance. All these methods are still widely ltsed. But recently several new techniques have gained attention, such as thermomagnetometry, thermomechanical analysis and thermosonimetry. Improved equipment made possible the application of thermal methods to problems in thermodynamics and kinetics (e.g. by means of differential scanning calorimetry, DSC). This progress in the construction of new instruments as well as the combination of existing methods to enable simultaneous determinations (e.g. TG/DTA; TG/IR spectroscopy; DTA/mass spectrometry; DTA/microscopy; high-pressure DTA) have led to a resurgence in the use and application of thermal analysis in the earth sciences. Here the applications cover such diverse areas as the examination of individual minerals, mineral mixtures, rocks, soils, ceramics, cements, raw materials as well as their industrial evaluation, performance assessment and quality control. In the field of solid fossil fuels thermal determinations range from proximate analysis of inorganic constituents and the measurement of calorific values to the assessment of the environmental aspects of fly ashes and mineral residues. To support this tendency, the International Confederation for Thermal Analysis (ICTA) has recently founded a "Committee for Thermal Analysis in Geosciences". The aim of this committee shall be to discuss, improve and distribute the knowledge about the possibilities of solving geoscientific questions by means of thermal analytic methods...

Description / Table of Contents: W. A. England and A. J. Fleet: Introduction / Geological Society, London, Special Publications, 59:1-6, doi:10.1144/GSL.SP.1991.059.01.01 --- Part I: Generation and Expulsion (Primary Migration) --- Andrew S. Pepper: Estimating the petroleum expulsion behaviour of source rocks: a novel quantitative approach / Geological Society, London, Special Publications, 59:9-31, doi:10.1144/GSL.SP.1991.059.01.02 --- D. Leythaeuser and H. S. Poelchau: Expulsion of petroleum from type III kerogen source rocks in gaseous solution: modelling of solubility fractionation / Geological Society, London, Special Publications, 59:33-46, doi:10.1144/GSL.SP.1991.059.01.03 --- S. J. Düppenbecker, L. Dohmen, and D. H. Welte: Numerical modelling of petroleum expulsion in two areas of the Lower Saxony Basin, Northern Germany / Geological Society, London, Special Publications, 59:47-64, doi:10.1144/GSL.SP.1991.059.01.04 --- B. S. Mudford, F. M. Gradstein, T. J. Katsube, and M. E. Best: Modelling 1D compaction-driven flow in sedimentary basins: a comparison of the Scotian Shelf, North Sea and Gulf Coast / Geological Society, London, Special Publications, 59:65-85, doi:10.1144/GSL.SP.1991.059.01.05 --- Part II: Secondary Migration --- J. Burrus, A. Kuhfuss, B. Doligez, and P. Ungerer: Are numerical models useful in reconstructing the migration of hydrocarbons? A discussion based on the Northern Viking Graben / Geological Society, London, Special Publications, 59:89-109, doi:10.1144/GSL.SP.1991.059.01.06 --- Øyvind Sylta: Modelling of secondary migration and entrapment of a multicomponent hydrocarbon mixture using equation of state and ray-tracing modelling techniques / Geological Society, London, Special Publications, 59:111-122, doi:10.1144/GSL.SP.1991.059.01.07 --- D. S. Chapman, S. D. Willett, and C. Clauser: Using thermal fields to estimate basin-scale permeabilities / Geological Society, London, Special Publications, 59:123-125, doi:10.1144/GSL.SP.1991.059.01.08 --- Richard W. Davis: Integration of geological data into hydrodynamic analysis of hydrocarbon movement / Geological Society, London, Special Publications, 59:127-135, doi:10.1144/GSL.SP.1991.059.01.09 --- Stephen Larter and Nigel Mills: Phase-controlled molecular fractionations in migrating petroleum charges / Geological Society, London, Special Publications, 59:137-147, doi:10.1144/GSL.SP.1991.059.01.10 --- B. M. Krooss, L. Brothers, and M. H. Engel: Geochromatography in petroleum migration: a review / Geological Society, London, Special Publications, 59:149-163, doi:10.1144/GSL.SP.1991.059.01.11 --- Part III: Case Studies --- P. C. Barnard and M. A. Bastow: Hydrocarbon generation, migration, alteration, entrapment and mixing in the Central and Northern North Sea / Geological Society, London, Special Publications, 59:167-190, doi:10.1144/GSL.SP.1991.059.01.12 --- K. F. M. Thompson: Contrasting characteristics attributed to migration observed in petroleums reservoired in clastic and carbonate sequences in the Gulf of Mexico region / Geological Society, London, Special Publications, 59:191-205, doi:10.1144/GSL.SP.1991.059.01.13 --- N. Piggott and M. D. Lines: A case study of migration from the West Canada Basin / Geological Society, London, Special Publications, 59:207-225, doi:10.1144/GSL.SP.1991.059.01.14 --- Robert W. H. Butler: Hydrocarbon maturation, migration and tectonic loading in the Western Alpine foreland thrust belt / Geological Society, London, Special Publications, 59:227-244, doi:10.1144/GSL.SP.1991.059.01.15 --- Gerald Roberts: Structural controls on fluid migration through the Rencurel thrust zone, Vercors, French Sub-Alpine Chains / Geological Society, London, Special Publications, 59:245-262, doi:10.1144/GSL.SP.1991.059.01.16 --- Part IV: Trap Leakage and Subsequent Migration --- R. H. Clarke and R. W. Cleverly: Petroleum seepage and post-accumulation migration / Geological Society, London, Special Publications, 59:265-271, doi:10.1144/GSL.SP.1991.059.01.17 --- E. Vik, O. R. Heum, and K. G. Amaliksen: Leakage from deep reservoirs: possible mechanisms and relationship to shallow gas in the Haltenbanken area, mid-Norwegian Shelf / Geological Society, London, Special Publications, 59:273, doi:10.1144/GSL.SP.1991.059.01.18

Description / Table of Contents: P. D. W. Haughton, S. P. Todd, and A. C. Morton: Sedimentary provenance studies / Geological Society, London, Special Publications, 57:1-11, doi:10.1144/GSL.SP.1991.057.01.01 --- P. Allen: Provenance research: Torridonian and Wealden / Geological Society, London, Special Publications, 57:13-21, doi:10.1144/GSL.SP.1991.057.01.02 --- Gian Gaspare Zuffa: On the use of turbidite arenites in provenance studies: critical remarks / Geological Society, London, Special Publications, 57:23-29, doi:10.1144/GSL.SP.1991.057.01.03 --- Andrew C. Morton: Geochemical studies of detrital heavy minerals and their application to provenance research / Geological Society, London, Special Publications, 57:31-45, doi:10.1144/GSL.SP.1991.057.01.04 --- Amparo Tortosa, Marta Palomares, and José Arribas: Quartz grain types in Holocene deposits from the Spanish Central System: some problems in provenance analysis / Geological Society, London, Special Publications, 57:47-54, doi:10.1144/GSL.SP.1991.057.01.05 --- Abhijit Basu and Emanuela Molinaroli: Reliability and application of detrital opaque Fe-Ti oxide minerals in provenance determination / Geological Society, London, Special Publications, 57:55-65, doi:10.1144/GSL.SP.1991.057.01.06 --- Anthony J. Hurford and Andrew Carter: The role of fission track dating in discrimination of provenance / Geological Society, London, Special Publications, 57:67-78, doi:10.1144/GSL.SP.1991.057.01.07 --- D. J. Batten: Reworking of plant microfossils and sedimentary provenance / Geological Society, London, Special Publications, 57:79-90, doi:10.1144/GSL.SP.1991.057.01.08 --- Michael A. Velbel and Mounir K. Saad: Palaeoweathering or diagenesis as the principal modifier of sandstone framework composition? A case study from some Triassic rift-valley redbeds of eastern North America / Geological Society, London, Special Publications, 57:91-99, doi:10.1144/GSL.SP.1991.057.01.09 --- A. E. Milodowski and J. A. Zalasiewicz: Redistribution of rare earth elements during diagenesis of turbidite/hemipelagite mudrock sequences of Llandovery age from central Wales / Geological Society, London, Special Publications, 57:101-124, doi:10.1144/GSL.SP.1991.057.01.10 --- R. Valloni, D. Lazzari, and M. A. Calzolari: Selective alteration of arkose framework in Oligo-Miocene turbidites of the Northern Apennines foreland: impact on sedimentary provenance analysis / Geological Society, London, Special Publications, 57:125-136, doi:10.1144/GSL.SP.1991.057.01.11 --- R. A. Cliff, S. E. Drewery, and M. R. Leeder: Sourcelands for the Carboniferous Pennine river system: constraints from sedimentary evidence and U-Pb geochronology using zircon and monazite / Geological Society, London, Special Publications, 57:137-159, doi:10.1144/GSL.SP.1991.057.01.12 --- Jane A. Evans, Philip Stone, and James D. Floyd: Isotopic characteristics of Ordovician greywacke provenance in the Southern Uplands of Scotland / Geological Society, London, Special Publications, 57:161-172, doi:10.1144/GSL.SP.1991.057.01.13 --- P. A. Floyd, R. Shail, B. E. Leveridge, and W. Franke: Geochemistry and provenance of Rhenohercynian synorogenic sandstones: implications for tectonic environment discrimination / Geological Society, London, Special Publications, 57:173-188, doi:10.1144/GSL.SP.1991.057.01.14 --- Christopher M. Gerrard: Sedimentary petrology and the archaeologist: the study of ancient ceramics / Geological Society, London, Special Publications, 57:189-197, doi:10.1144/GSL.SP.1991.057.01.15 --- John R. Graham, John P. Wrafter, Stephen Daly, and Julian F. Menuge: A local source for the Ordovician Derryveeny Formation, western Ireland: implications for the Connemara Dalradian / Geological Society, London, Special Publications, 57:199-213, doi:10.1144/GSL.SP.1991.057.01.16 --- T. McCann: Petrological and geochemical determination of provenance in the southern Welsh Basin / Geological Society, London, Special Publications, 57:215-230, doi:10.1144/GSL.SP.1991.057.01.17 --- Duncan Pirrie: Controls on the petrographic evolution of an active margin sedimentary sequence: the Larsen Basin, Antarctica / Geological Society, London, Special Publications, 57:231-249, doi:10.1144/GSL.SP.1991.057.01.18 --- Bernard Humphreys, Andrew C. Morton, Claire R. Hallsworth, Robert W. Gatliff, and James B. Riding: An integrated approach to provenance studies: a case example from the Upper Jurassic of the Central Graben, North Sea / Geological Society, London, Special Publications, 57:251-262, doi:10.1144/GSL.SP.1991.057.01.19 --- José Arribas and M. Eugenia Arribas: Petrographic evidence of different provenance in two alluvial fan systems (Palaeogene of the northern Tajo Basin, Spain) / Geological Society, London, Special Publications, 57:263-271, doi:10.1144/GSL.SP.1991.057.01.20 --- I. R. Garden: Changes in the provenance of pebbly detritus in southern Britain and northern France associated with basin rifting / Geological Society, London, Special Publications, 57:273-289, doi:10.1144/GSL.SP.1991.057.01.21 --- Gary Nichols, Kusnama, and Robert Hall: Sandstones of arc and ophiolite provenance in backarc basin, Halmahera, eastern Indonesia / Geological Society, London, Special Publications, 57:291-303, doi:10.1144/GSL.SP.1991.057.01.22 --- Peter A. Cawood: Nature and record of igneous activity in the Tonga arc, SW Pacific, deduced from the phase chemistry of derived detrital grains / Geological Society, London, Special Publications, 57:305-321, doi:10.1144/GSL.SP.1991.057.01.23 --- Martin J. Evans and Maria A. Mange-Rajetzky: The provenance of sediments in the Barrême thrust-top basin, Haute-Provence, France / Geological Society, London, Special Publications, 57:323-342, doi:10.1144/GSL.SP.1991.057.01.24 --- Simon J. Cuthbert: Evolution of the Devonian Hornelen Basin, west Norway: new constraints from petrological studies of metamorphic clasts / Geological Society, London, Special Publications, 57:343-360, doi:10.1144/GSL.SP.1991.057.01.25

Description / Table of Contents: R. F. P. Hardman and J. E. Booth: The significance of normal faults in the exploration and production of North Sea hydrocarbons / Geological Society, London, Special Publications, 56:1-13, doi:10.1144/GSL.SP.1991.056.01.01 --- Seismic and Subsurface Studies --- David Barr: Subsidence and sedimentation in semi-starved half-graben: a model based on North Sea data / Geological Society, London, Special Publications, 56:17-28, doi:10.1144/GSL.SP.1991.056.01.02 --- Joseph Cartwright: The kinematic evolution of the Coffee Soil Fault / Geological Society, London, Special Publications, 56:29-40, doi:10.1144/GSL.SP.1991.056.01.03 --- N. J. Kusznir, G. Marsden, and S. S. Egan: A flexural-cantilever simple-shear/pure-shear model of continental lithosphere extension: applications to the Jeanne d’Arc Basin, Grand Banks and Viking Graben, North Sea / Geological Society, London, Special Publications, 56:41-60, doi:10.1144/GSL.SP.1991.056.01.04 --- Alan M. Roberts and Graham Yielding: Deformation around basin-margin faults in the North Sea/mid-Norway rift / Geological Society, London, Special Publications, 56:61-78, doi:10.1144/GSL.SP.1991.056.01.05 --- G. Yielding, M. E. Badley, and B. Freeman: Seismic reflections from normal faults in the northern North Sea / Geological Society, London, Special Publications, 56:79-89, doi:10.1144/GSL.SP.1991.056.01.06 --- Field-Based Studies --- M. P. Coward, R. Gillcrist, and B. Trudgill: Extensional structures and their tectonic inversion in the Western Alps / Geological Society, London, Special Publications, 56:93-112, doi:10.1144/GSL.SP.1991.056.01.07 --- Andreas G. Koestler and Werner U. Ehrmann: Description of brittle extensional features in chalk on the crest of a salt ridge (NW Germany) / Geological Society, London, Special Publications, 56:113-123, doi:10.1144/GSL.SP.1991.056.01.08 --- Steven Roberts and James Jackson: Active normal faulting in central Greece: an overview / Geological Society, London, Special Publications, 56:125-142, doi:10.1144/GSL.SP.1991.056.01.09 --- Rob Westaway: Continental extension on sets of parallel faults: observational evidence and theoretical models / Geological Society, London, Special Publications, 56:143-169, doi:10.1144/GSL.SP.1991.056.01.10 --- Fault-Displacement Studies --- A. Beach and P. Trayner: The geometry of normal faults in a sector of the offshore Nile Delta, Egypt / Geological Society, London, Special Publications, 56:173-182, doi:10.1144/GSL.SP.1991.056.01.11 --- T. J. Chapman and A. W. Meneilly: The displacement patterns associated with a reverse-reactivated, normal growth fault / Geological Society, London, Special Publications, 56:183-191, doi:10.1144/GSL.SP.1991.056.01.12 --- John J. Walsh and Juan Watterson: Geometric and kinematic coherence and scale effects in normal fault systems / Geological Society, London, Special Publications, 56:193-203, doi:10.1144/GSL.SP.1991.056.01.13 --- Analogue-Modelling and Section-Balancing --- G. Dresen, U. Gwildis, and Th. Kluegel: Numerical and analogue modelling of normal fault geometry / Geological Society, London, Special Publications, 56:207-217, doi:10.1144/GSL.SP.1991.056.01.14 --- Robert W. Krantz: Normal fault geometry and fault reactivation in tectonic inversion experiments / Geological Society, London, Special Publications, 56:219-229, doi:10.1144/GSL.SP.1991.056.01.15 --- K. R. McClay, D. A. Waltham, A. D. Scott, and A. Abousetta: Physical and seismic modelling of listric normal fault geometries / Geological Society, London, Special Publications, 56:231-239, doi:10.1144/GSL.SP.1991.056.01.16 --- Bruno Vendeville: Mechanisms generating normal fault curvature: a review illustrated by physical models / Geological Society, London, Special Publications, 56:241-249, doi:10.1144/GSL.SP.1991.056.01.17 --- Nicky White and Graham Yielding: Calculating normal fault geometries at depth: theory and examples / Geological Society, London, Special Publications, 56:251-260, doi:10.1144/GSL.SP.1991.056.01.18

Description / Table of Contents: R. V. Tyson and T. H. Pearson: Modern and ancient continental shelf anoxia: an overview / Geological Society, London, Special Publications, 58:1-24, doi:10.1144/GSL.SP.1991.058.01.01 --- Modern Shelf Anoxia --- Donald F. Boesch and Nancy N. Rabalais: Effects of hypoxia on continental shelf benthos: comparisons between the New York Bight and the Northern Gulf of Mexico / Geological Society, London, Special Publications, 58:27-34, doi:10.1144/GSL.SP.1991.058.01.02 --- Nancy N. Rabalais, R. Eugene Turner, William J. Wiseman, Jr., and Donald F. Boesch: A brief summary of hypoxia on the northern Gulf of Mexico continental shelf: 1985–1988 / Geological Society, London, Special Publications, 58:35-47, doi:10.1144/GSL.SP.1991.058.01.03 --- Donald E. Harper, Jr, Larry D. McKinney, James M. Nance, and Robert R. Salzer: Recovery responses of two benthic assemblages following an acute hypoxic event on the Texas continental shelf, northwestern Gulf of Mexico / Geological Society, London, Special Publications, 58:49-64, doi:10.1144/GSL.SP.1991.058.01.04 --- G. J. Van Der Zwaan and F. J. Jorissen: Biofacial patterns in river-induced shelf anoxia / Geological Society, London, Special Publications, 58:65-82, doi:10.1144/GSL.SP.1991.058.01.05 --- Thomas C. Malone: River flow, phytoplankton production and oxygen depletion in Chesapeake Bay / Geological Society, London, Special Publications, 58:83-93, doi:10.1144/GSL.SP.1991.058.01.06 --- Dubravko Justić: Hypoxic conditions in the northern Adriatic Sea: historical development and ecological significance / Geological Society, London, Special Publications, 58:95-105, doi:10.1144/GSL.SP.1991.058.01.07 --- Jadran Faganeli, Jož Pezdič, Bojan Ogorelec, Gerhard J. Herndl, and Tadej Dolenec: The role of sedimentary biogeochemistry in the formation of hypoxia in shallow coastal waters (Gulf of Trieste, northern Adriatic) / Geological Society, London, Special Publications, 58:107-117, doi:10.1144/GSL.SP.1991.058.01.08 --- Michael Stachowitsch: Anoxia in the Northern Adriatic Sea: rapid death, slow recovery / Geological Society, London, Special Publications, 58:119-129, doi:10.1144/GSL.SP.1991.058.01.09 --- Wolf E. Arntz, Juan Tarazona, Victor A. Gallardo, Luis A. Flores, and Horst Salzwedel: Benthos communities in oxygen deficient shelf and upper slope areas of the Peruvian and Chilean Pacific coast, and changes caused by El Niño / Geological Society, London, Special Publications, 58:131-154, doi:10.1144/GSL.SP.1991.058.01.10 --- Kay-Christian Emeis, Jean K. Whelan, and Martha Tarafa: Sedimentary and geochemical expressions of oxic and anoxic conditions on the Peru Shelf / Geological Society, London, Special Publications, 58:155-170, doi:10.1144/GSL.SP.1991.058.01.11 --- Geoffrey W. Bailey: Organic carbon flux and development of oxygen deficiency on the modern Benguela continential shelf south of 22°S: spatial and temporal variability / Geological Society, London, Special Publications, 58:171-183, doi:10.1144/GSL.SP.1991.058.01.12 --- Ancient Shelf Anoxia --- Donald C. Rhoads, Sandor G. Mulsow, Raymond Gutschick, Christopher T. Baldwin, and John F. Stolz: The dysaerobic zone revisited: a magnetic facies? / Geological Society, London, Special Publications, 58:187-199, doi:10.1144/GSL.SP.1991.058.01.13 --- Charles E. Savrda and David J. Bottjer: Oxygen-related biofacies in marine strata: an overview and update / Geological Society, London, Special Publications, 58:201-219, doi:10.1144/GSL.SP.1991.058.01.14 --- M. Carmela Cuomo and Paul R. Bartholomew: Pelletal black shale fabrics: their origin and significance / Geological Society, London, Special Publications, 58:221-232, doi:10.1144/GSL.SP.1991.058.01.15 --- Gordon C. Baird and Carlton E. Brett: Submarine erosion on the anoxic sea floor: stratinomic, palaeoenvironmental, and temporal significance of reworked pyritebone deposits / Geological Society, London, Special Publications, 58:233-257, doi:10.1144/GSL.SP.1991.058.01.16 --- P. H. Heckel: Thin widespread Pennsylvanian black shales of Midcontinent North America: a record of a cyclic succession of widespread pycnoclines in a fluctuating epeiric sea / Geological Society, London, Special Publications, 58:259-273, doi:10.1144/GSL.SP.1991.058.01.17 --- Stefan Piasecki and Lars Stemmerik: Late Permian anoxia in central East Greenland / Geological Society, London, Special Publications, 58:275-290, doi:10.1144/GSL.SP.1991.058.01.18 --- Paul B. Wignall and Anthony Hallam: Biofacies, stratigraphic distribution and depositional models of British onshore Jurassic black shales / Geological Society, London, Special Publications, 58:291-309, doi:10.1144/GSL.SP.1991.058.01.19 --- R. Littke, D. Leythaeuser, J. Rullkötter, and D. R. Baker: Keys to the depositional history of the Posidonia Shale (Toarcian) in the Hils Syncline, northern Germany / Geological Society, London, Special Publications, 58:311-333, doi:10.1144/GSL.SP.1991.058.01.20 --- Michael Prauss, Bertrand Ligouis, and Hanspeter Luterbacher: Organic matter and palynomorphs in the ‘Posidonienschiefer’ (Toarcian, Lower Jurassic) of southern Germany / Geological Society, London, Special Publications, 58:335-351, doi:10.1144/GSL.SP.1991.058.01.21 --- Hans-J. Brumsack: Inorganic geochemistry of the German ‘Posidonia Shale’: palaeoenvironmental consequences / Geological Society, London, Special Publications, 58:353-362, doi:10.1144/GSL.SP.1991.058.01.22 --- J. D. Hudson and David M. Martill: The Lower Oxford Clay: production and preservation of organic matter in the Callovian (Jurassic) of central England / Geological Society, London, Special Publications, 58:363-379, doi:10.1144/GSL.SP.1991.058.01.23 --- Wolfgang Oschmann: Distribution, dynamics and palaeoecology of Kimmeridgian (Upper Jurassic) shelf anoxia in western Europe / Geological Society, London, Special Publications, 58:381-395, doi:10.1144/GSL.SP.1991.058.01.24 --- Peter Doyle and Andrew G. Whitham: Palaeoenvironments of the Nordenskjöld Formation: an Antarctic Late Jurassic—Early Cretaceous black shale-tuff sequence / Geological Society, London, Special Publications, 58:397-414, doi:10.1144/GSL.SP.1991.058.01.25 --- Jean-G. Bréhéret: Glauconitization episodes in marginal settings as echoes of mid-Cretaceous anoxic events in the Vocontian basin (SE France) / Geological Society, London, Special Publications, 58:415-425, doi:10.1144/GSL.SP.1991.058.01.26 --- E. A. M. Koutsoukos, M. R. Mello, and N. C. de Azambuja Filho: Micropalaeontological and geochemical evidence of mid-Cretaceous dysoxic-anoxic palaeoenvironments in the Sergipe Basin, northeastern Brazil / Geological Society, London, Special Publications, 58:427-447, doi:10.1144/GSL.SP.1991.058.01.27 --- István Vetö and Magdolna Hetényi: Fate of organic carbon and reduced sulphur in dysoxic-anoxic Oligocene facies of the Central Paratethys (Carpathian Mountains and Hungary) / Geological Society, London, Special Publications, 58:449-460, doi:10.1144/GSL.SP.1991.058.01.28