ALBERT

Description / Table of Contents: Mantle and Magmatic Processes --- George P. L. Walker: Basaltic-volcano systems / Geological Society, London, Special Publications, 76:3-38, doi:10.1144/GSL.SP.1993.076.01.01 --- M. J. O’Hara: Trace element geochemical effects of imperfect crystal-liquid separation / Geological Society, London, Special Publications, 76:39-59, doi:10.1144/GSL.SP.1993.076.01.02 --- Alexander R. McBirney: Differentiated rocks of the Galapagos hotspot / Geological Society, London, Special Publications, 76:61-69, doi:10.1144/GSL.SP.1993.076.01.03 --- Martin A. Menzies, Weiming Fan, and Ming Zhang: Palaeozoic and Cenozoic lithoprobes and the loss of 〉120 km of Archaean lithosphere, Sino-Korean craton, China / Geological Society, London, Special Publications, 76:71-81, doi:10.1144/GSL.SP.1993.076.01.04 --- Ophiolites and Oceanic Crust --- Alastair Robertson and Costas Xenophontos: Development of concepts concerning the Troodos ophiolite and adjacent units in Cyprus / Geological Society, London, Special Publications, 76:85-119, doi:10.1144/GSL.SP.1993.076.01.05 --- Dorothee Dietrich and Sara Spencer: Spreading-induced faulting and fracturing of oceanic crust: examples from the Sheeted Dyke Complex of the Troodos ophiolite, Cyprus / Geological Society, London, Special Publications, 76:121-139, doi:10.1144/GSL.SP.1993.076.01.06 --- C. J. MacLeod and B. J. Murton: Structure and tectonic evolution of the Southern Troodos Transform Fault Zone, Cyprus / Geological Society, London, Special Publications, 76:141-176, doi:10.1144/GSL.SP.1993.076.01.07 --- J. Malpas, T. Calon, and G. Squires: The development of a late Cretaceous microplate suture zone in SW Cyprus / Geological Society, London, Special Publications, 76:177-195, doi:10.1144/GSL.SP.1993.076.01.08 --- A. W. Shelton: Troodos revisited: the Mount Olympus gravity anomaly / Geological Society, London, Special Publications, 76:197-212, doi:10.1144/GSL.SP.1993.076.01.09 --- Alan G. Smith: Tectonic significance of the Hellenic-Dinaric ophiolites / Geological Society, London, Special Publications, 76:213-243, doi:10.1144/GSL.SP.1993.076.01.10 --- I. D. Bartholomew: The interaction and geometries of diapiric uprise centres along mid-ocean ridges — evidence from mantle fabric studies of ophiolite complexes / Geological Society, London, Special Publications, 76:245-256, doi:10.1144/GSL.SP.1993.076.01.11 --- Stephen Roberts and Christopher Neary: Petrogenesis of ophiolitic chromitite / Geological Society, London, Special Publications, 76:257-272, doi:10.1144/GSL.SP.1993.076.01.12 --- H. M. Prichard and R. A. Lord: An overview of the PGE concentrations in the Shetland ophiolite complex / Geological Society, London, Special Publications, 76:273-294, doi:10.1144/GSL.SP.1993.076.01.13 --- H. Elderfield, R. A. Mills, and M. D. Rudnicki: Geochemical and thermal fluxes, high-temperature venting and diffuse flow from mid-ocean ridge hydrothermal systems: the TAG hydrothermal field, Mid-Atlantic Ridge 26°N / Geological Society, London, Special Publications, 76:295-307, doi:10.1144/GSL.SP.1993.076.01.14 --- Martin A. Menzies, Andrew Long, Gerry Ingram, Matthew Tatnell, and David Janecky: MORB peridotite-sea water interaction: experimental constraints on the behaviour of trace elements, 87Sr/86Sr and 143Nd/144Nd ratios / Geological Society, London, Special Publications, 76:309-322, doi:10.1144/GSL.SP.1993.076.01.15 --- Tectonics and Convergent Margins --- J. F. Dewey, P. D. Ryan, and T. B. Andersen: Orogenic uplift and collapse, crustal thickness, fabrics and metamorphic phase changes: the role of eclogites / Geological Society, London, Special Publications, 76:325-343, doi:10.1144/GSL.SP.1993.076.01.16 --- Robert M. Shackleton: Tectonics of the Mozambique Belt in East Africa / Geological Society, London, Special Publications, 76:345-362, doi:10.1144/GSL.SP.1993.076.01.17 --- N. B. W. Harris, C. J. Hawkesworth, and A. G. Tindle: The growth of continental crust during the Late Proterozoic: geochemical evidence from the Arabian Shield / Geological Society, London, Special Publications, 76:363-371, doi:10.1144/GSL.SP.1993.076.01.18 --- Julian A. Pearce and Ian J. Parkinson: Trace element models for mantle melting: application to volcanic arc petrogenesis / Geological Society, London, Special Publications, 76:373-403, doi:10.1144/GSL.SP.1993.076.01.19 --- Peter J. Wyllie and Michael B. Wolf: Amphibolite dehydration-melting: sorting out the solidus / Geological Society, London, Special Publications, 76:405-416, doi:10.1144/GSL.SP.1993.076.01.20 --- Claudio Vita-Finzi: Evaluating Late Quaternary uplift in Greece and Cyprus / Geological Society, London, Special Publications, 76:417-424, doi:10.1144/GSL.SP.1993.076.01.21 --- Continental Rifting --- Ray Macdonald and Brian G. J. Upton: The Proterozoic Gardar rift zone, south Greenland: comparisons with the East African Rift System / Geological Society, London, Special Publications, 76:427-442, doi:10.1144/GSL.SP.1993.076.01.22 --- K. G. Cox, N. Charnley, R. C. O. Gill, and K. A. Parish: Alkali basalts from Shuqra, Yemen: magmas generated in the crust-mantle transition zone? / Geological Society, London, Special Publications, 76:443-453, doi:10.1144/GSL.SP.1993.076.01.23 --- N. W. Rogers: The isotope and trace element geochemistry of basalts from the volcanic islands of the southern Red Sea / Geological Society, London, Special Publications, 76:455-467, doi:10.1144/GSL.SP.1993.076.01.24 --- Jon M. Davis, Wolfgang E. Elston, and Chris J. Hawkesworth: Basic and intermediate volcanism of the Mogollon-Datil volcanic field: implications for mid-Tertiary tectonic transitions in southwestern New Mexico, USA / Geological Society, London, Special Publications, 76:469-488, doi:10.1144/GSL.SP.1993.076.01.25 --- George P. L. Walker: Re-evaluation of inclined intrusive sheets and dykes in the Cuillins volcano, Isle of Skye / Geological Society, London, Special Publications, 76:489-497, doi:10.1144/GSL.SP.1993.076.01.26 --- Analytical Techniques --- Philip J. Potts, Chris J. Hawkesworth, Peter van Calsteren, and Ian P. Wright: Advances in analytical technology and its influence on the development of modern inorganic geochemistry: a historical perspective / Geological Society, London, Special Publications, 76:501-520, doi:10.1144/GSL.SP.1993.076.01.27

Description / Table of Contents: PREFACE This volume presents results from members of the Project 216 "Global Biological Events in Earth History" of the International Geological Correlation Programme (IGCP). The project, initiated by the elder editor (O.H.W.) within the framework of the International Palaeontological Association (IPA) in the late 70s, was officially established in 1984. Subsequently, it led to the first three conferences on Global Bio-Events, and their respective symposia volumes: 1) In G6ttingen, West Germany in 1986 (WaUiser, O. H., Ed., 1986, Global Bio-Events, Springer-Verlag); in Bilbao, Spain in 1987 (Lamolda, M. A., Kauffrnan, E. G., and Walliser, O. H., Eds., 1988, Paleontology and Evolution: Extinction Events; Rev. Espafiola de Paleont., n. extraord.); and in Boulder, Colorado, U.S.A. in 1988 (this volume). The next meeting, on Innovations and Revolutions in the Biosphere, is planned in Oxford, England in 1990, to be hosted by Martin Brasier. During the history of this project, the focus of our research has shifted significantly. Initial focus was on specific global mass extinctions (e.g. the Precambrian/Cambrian, Frasnian/Fammenian, Cretaceous/Tertiary, and Eocene/Oligocene events) to a broader treatment of Phanerozoic mass extinctions, their differences or unifying factors, and their causal mechanisms. Subsequent meetings have attempted to focus attention on a fuller spectrum of global bio-events in Earth history. The Boulder Conference, and this volume, although still strongly influenced by the excitement of mass extinction research, expresses these new trends in bioevent studies. The Boulder conference, held on May 16-23, 1988, focused on a broad spectrum of Abrupt Changes in the Global Biota. Over 100 participants from 13 nations attended this meeting, representing diverse disciplines of palaeobiology, palaeoclimatology, palaeoceanography, sedimentology, geochemistry, and a broad spectrum of the stratigraphic and geological sciences. Four days of talks were supplemented by field trips to the continental Cretaceous/Tertiary boundary in the Raton Basin, New Mexico, and to the Cenomanian/Turonian mass extinction interval exposed near Pueblo, Colorado. The Conference itself was characterized by a great diversity of approaches to bio-event research, and the phenomenon of mass extinction. In particular, interactive causes involving both extraterrestrial and earthbound (tectonic, oceanographic, climatic) forces were discussed, and each major Phanerozoic mass extinction was treated by specialists in the field. In addition, many presentations focused on the causal mechanism and patterns of bio-event development that were not restricted to mass extinction intervals, but which could cause regional to global biotic response at any time in Earth history. Thus, both the conference, and this volume, focus attention on climatic and oceanic perturbations from anoxia, advection, rapid thermal change, toxic chemical enrichment, and energy shock from impacts and giant tsunamis as forcing mechanism for regional to global bio-events. The delicate balance of perched ocean/ctimate~fe systems under typical warm equable non-glacial Phanerozoic conditions, and their susceptibility to shock from even small perturbations, was a philosophical theme that ran throughout the meeting. The case for extraterrestrial forcing of tectonic, volcanic, and biological events was greatly strengthened by new data presented at this conference, with special concern for the effects of small comet/meteorite impacts in the oceans, and their chemical/physical/biological signature which might be used, in the absence of shocked minerals, microspheres or trace metals, to identify extraterrestrial events associated with global and regional bio-events. The conference benefitted from the introduction of much new data at high levels of resolution, especially from poorly studied mass extinction intervals. Interactive discussions, and many new ideas characterized the meeting. The new scientific results of this meeting are exciting; they are reviewed in the Conference Report published in Episodes (1988, v. 11, n. 4, p. 289-292). Most of the key papers presented at the Boulder meeting appear in this volume. What lies ahead in bio-event research? Clearly, a great deal of excitement and an age of discovery. We have only touched the surface of this new and dynamic field. We are starting to comprehend the dynamics of global mass extinctions, integrating detailed geochemical, physical and biological data into scenarios of cause and effect. But in the years ahead lies the job of understanding the whole spectrum of regional bioevents preserved in the ancient record, and especially the application of this research to solutions of the critical problems inherent in global change and the modern biotic crisis. Future directions for research at this conference include the investigation and modeling of abrupt chemical and thermal shifts in the ocean, the effects of impacts at deep ocean sites, the documentation of successful survival strategies and repopulation patterns following biotic crises, the deep ocean record of bio-events, and focus on alternative forces other than impacting to account for mass extinction events. This volume introduces some of these new pathways in bio-event research.

Description / Table of Contents: A. H. F. Robertson, M. P. Searle, and A. C. Ries: Introduction / Geological Society, London, Special Publications, 49:xi-xviii, doi:10.1144/GSL.SP.1992.049.01.01 --- Evolution of the Oman Tethyan Continental Margin --- A. H. F. Robertson and M. P. Searle: The northern Oman Tethyan continental margin: stratigraphy, structure, concepts and controversies / Geological Society, London, Special Publications, 49:3-25, doi:10.1144/GSL.SP.1992.049.01.02 --- W. Blendinger, A. van Vliet, and M. W. Hughes Clarke: Updoming, rifting and continental margin development during the Late Palaeozoic in northern Oman / Geological Society, London, Special Publications, 49:27-37, doi:10.1144/GSL.SP.1992.049.01.03 --- C. W. Lee: A review of platform sedimentation in the Early and Late Permian of Oman, with particular reference to the Oman Mountains / Geological Society, London, Special Publications, 49:39-47, doi:10.1144/GSL.SP.1992.049.01.04 --- D. Rabu, J. Le Metour, F. Bechennec, M. Beurrier, M. Villey, and C. Bourdillon-Jeudy de Grissac: Sedimentary aspects of the Eo-Alpine cycle on the northeast edge of the Arabian Platform (Oman Mountains) / Geological Society, London, Special Publications, 49:49-68, doi:10.1144/GSL.SP.1992.049.01.05 --- Brian R. Pratt and John D. Smewing: Jurassic and Early Cretaceous platform margin configuration and evolution, central Oman Mountains / Geological Society, London, Special Publications, 49:69-88, doi:10.1144/GSL.SP.1992.049.01.06 --- R. W. Scott: Chronostratigraphy of the Cretaceous carbonate shelf, southeastern Arabia / Geological Society, London, Special Publications, 49:89-108, doi:10.1144/GSL.SP.1992.049.01.07 --- E. A. Haan, S. G. Corbin, M. W. Hughes Clarke, and J. E. Mabillard: The Lower Kahmah Group of Oman: the carbonate fill of a marginal shelf basin / Geological Society, London, Special Publications, 49:109-125, doi:10.1144/GSL.SP.1992.049.01.08 --- P. D. Wagner: Geochemical stratigraphy and porosity controls in Cretaceous carbonates near the Oman Mountains / Geological Society, London, Special Publications, 49:127-137, doi:10.1144/GSL.SP.1992.049.01.09 --- K. F. Watts: Mesozoic carbonate slope facies marking the Arabian platform margin in Oman: depositional history, morphology and palaeogeography / Geological Society, London, Special Publications, 49:139-159, doi:10.1144/GSL.SP.1992.049.01.10 --- D. J. W. Cooper: Sedimentary evolution and palaeogeographical reconstruction of the Mesozoic continental rise in Oman: evidence from the Hamrat Duru Group / Geological Society, London, Special Publications, 49:161-187, doi:10.1144/GSL.SP.1992.049.01.11 --- D. Bernoulli, H. Weissert, and C. D. Blome: Evolution of the Triassic Hawasina Basin, Central Oman Mountains / Geological Society, London, Special Publications, 49:189-202, doi:10.1144/GSL.SP.1992.049.01.12 --- E. T. Tozer and T. J. Calon: Triassic ammonoids from Jabal Safra and Wadi Alwa, Oman, and their significance / Geological Society, London, Special Publications, 49:203-211, doi:10.1144/GSL.SP.1992.049.01.13 --- F. Bechennec, J. Le Metour, D. Rabu, Ch. Bourdillon-de-Grissac, P. de Wever, M. Beurrier, and M. Villey: The Hawasina Nappes: stratigraphy, palaeogeography and structural evolution of a fragment of the south-Tethyan passive continental margin / Geological Society, London, Special Publications, 49:213-223, doi:10.1144/GSL.SP.1992.049.01.14 --- P. De Weaver, Ch. Bourdillon-de Grissac, and F. Bechennec: Permian to Cretaceous radiolarian biostratigraphic data from the Hawasina Complex, Oman Mountains / Geological Society, London, Special Publications, 49:225-238, doi:10.1144/GSL.SP.1992.049.01.15 --- W. Kickmaier and Tj. Peters: Manganese occurrences in the Al Hammah Range — Wahrah Formation, Oman Mountains / Geological Society, London, Special Publications, 49:239-249, doi:10.1144/GSL.SP.1992.049.01.16 --- A. H. F. Robertson, C. D. Blome, D. W. J. Cooper, A. E. S. Kemp, and P. Searle: Evolution of the Arabian continental margin in the Dibba Zone, Northern Oman Mountains / Geological Society, London, Special Publications, 49:251-284, doi:10.1144/GSL.SP.1992.049.01.17 --- A. H. F. Robertson, A. E. S. Kemp, D. C. Rex, and C. D. Blome: Sedimentary and structural evolution of a continental margin transform lineament: the Hatta Zone, Northern Oman Mountains / Geological Society, London, Special Publications, 49:285-305, doi:10.1144/GSL.SP.1992.049.01.18 --- A. Mann and S. S. Hanna: The tectonic evolution of pre-Permian rocks, Central and Southeastern Oman Mountains / Geological Society, London, Special Publications, 49:307-325, doi:10.1144/GSL.SP.1992.049.01.19 --- J. Le Métour, D. Rabu, M. Tegyey, F. Béchennec, M. Beurrier, and M. Villey: Subduction and obduction: two stages in the Eo-Alpine tectonometamorphic evolution of the Oman Mountains / Geological Society, London, Special Publications, 49:327-339, doi:10.1144/GSL.SP.1992.049.01.20 --- Samir S. Hanna: The Alpine deformation of the Central Oman Mountains / Geological Society, London, Special Publications, 49:341-359, doi:10.1144/GSL.SP.1992.049.01.21 --- M. P. Searle, D. J. W. Cooper, and K. F. Watts: Structure of the Jebel Sumeini-Jebel Ghawil area, Northern Oman / Geological Society, London, Special Publications, 49:361-374, doi:10.1144/GSL.SP.1992.049.01.22 --- L. A. Dunne, P. R. Manoogian, and D. F. Pierini: Structural style and domains of the Northern Oman Mountains (Oman and United Arab Emirates) / Geological Society, London, Special Publications, 49:375-386, doi:10.1144/GSL.SP.1992.049.01.23 --- P. L. Michaelis and R. J. Pauken: Seismic interpretation of the structure and stratigraphy of the Strait of Hormuz / Geological Society, London, Special Publications, 49:387-395, doi:10.1144/GSL.SP.1992.049.01.24 --- D. R. D. Boote, D. Mou, and R. I. Waite: Structural evolution of the Suneinah Foreland, Central Oman Mountains / Geological Society, London, Special Publications, 49:397-418, doi:10.1144/GSL.SP.1992.049.01.25 --- J. Warburton, T. J. Burnhill, R. H. Graham, and K. P. Isaac: The evolution of the Oman Mountains Foreland Basin / Geological Society, London, Special Publications, 49:419-427, doi:10.1144/GSL.SP.1992.049.01.26 --- P. A. Cawood, F. K. Green, and T. J. Calon: Origin of culminations within the Southeast Oman Mountains at Jebel Ma-jhool and Ibra Dome / Geological Society, London, Special Publications, 49:429-445, doi:10.1144/GSL.SP.1992.049.01.27 --- D. Q. Coffield: Structures associated with nappe emplacement and culmination collapse in the Central Oman Mountains / Geological Society, London, Special Publications, 49:447-458, doi:10.1144/GSL.SP.1992.049.01.28 --- A. W. Shelton: The interpretation of gravity data in Oman: constraints on the ophiolite emplacement mechanism / Geological Society, London, Special Publications, 49:459-471, doi:10.1144/GSL.SP.1992.049.01.29 --- A. K. El-Shazly and R. G. Coleman: Metamorphism in the Oman Mountains in relation to the Semail ophiolite emplacement / Geological Society, London, Special Publications, 49:473-493, doi:10.1144/GSL.SP.1992.049.01.30 --- S. C. Nolan, P. W. Skelton, B. P. Clissold, and J. D. Smewing: Maastrichtian to early Tertiary stratigraphy and palaeogeography of the Central and Northern Oman Mountains / Geological Society, London, Special Publications, 49:495-519, doi:10.1144/GSL.SP.1992.049.01.31 --- P. W. Skelton, S. C. Nolan, and R. W. Scott: The Maastrichtian transgression onto the northwestern flank of the Proto-Oman Mountains: sequences of rudist-bearing beach to open shelf facies / Geological Society, London, Special Publications, 49:521-547, doi:10.1144/GSL.SP.1992.049.01.32 --- A. Mann, S. S. Hanna, S. C. Nolan, A. Mann, and S. S. Hanna: The post-Campanian tectonic evolution of the Central Oman Mountains: Tertiary extension of the Eastern Arabian Margin / Geological Society, London, Special Publications, 49:549-563, doi:10.1144/GSL.SP.1992.049.01.33 --- J. Maizels and C. McBean: Cenozoic alluvial fan systems of interior Oman: palaeoenvironmental reconstruction based on discrimination of palaeochannels using remotely sensed data / Geological Society, London, Special Publications, 49:565-582, doi:10.1144/GSL.SP.1992.049.01.34 --- Geology and Tectonics of South Oman --- I. G. Gass, A. C. Ries, R. M. Shackleton, and J. D. Smewing: Tectonics, geochronology and geochemistry of the Precambrian rocks of Oman / Geological Society, London, Special Publications, 49:585-599, doi:10.1144/GSL.SP.1992.049.01.35 --- V. P. Wright, A. C. Ries, and S. G. Munn: Intraplatformal basin-fill deposits from the Infracambrian Huqf Group, east Central Oman / Geological Society, London, Special Publications, 49:601-616, doi:10.1144/GSL.SP.1992.049.01.36 --- B. W. Mattes and S. Conway Morris: Carbonate/evaporite deposition in the Late Precambrian — Early Cambrian Ara Formation of Southern Oman / Geological Society, London, Special Publications, 49:617-636, doi:10.1144/GSL.SP.1992.049.01.37 --- A. P. Heward: Salt removal and sedimentation in Southern Oman / Geological Society, London, Special Publications, 49:637-651, doi:10.1144/GSL.SP.1992.049.01.38 --- A. C. Ries and R. M. Shackleton: Structures in the Huqf-Haushi Uplift, east Central Oman / Geological Society, London, Special Publications, 49:653-663, doi:10.1144/GSL.SP.1992.049.01.39 --- F. Moseley: The structure of Masirah Island, Oman / Geological Society, London, Special Publications, 49:665-671, doi:10.1144/GSL.SP.1992.049.01.40 --- R. M. Shackleton, A. C. Ries, P. R. Bird, J. B. Filbrandt, C. W. Lee, and G. C. Cunningham: The Batain Melange of NE Oman / Geological Society, London, Special Publications, 49:673-696, doi:10.1144/GSL.SP.1992.049.01.41 --- J. B. Filbrandt, S. C. Nolan, and A. C. Ries: Late Cretaceous and early Tertiary evolution of Jebel Ja’alan and adjacent areas, NE Oman / Geological Society, London, Special Publications, 49:697-714, doi:10.1144/GSL.SP.1992.049.01.42 --- R. M. Shackleton and A. C. Ries: Tectonics of the Masirah Fault Zone and eastern Oman / Geological Society, London, Special Publications, 49:715-724, doi:10.1144/GSL.SP.1992.049.01.43 --- G. S. Mountain and W. L. Prell: A multiphase plate tectonic history of the southeast continental margin of Oman / Geological Society, London, Special Publications, 49:725-743, doi:10.1144/GSL.SP.1992.049.01.44 --- Warren L. Prell and shipboard party of ODP Leg 117: Neogene tectonics and sedimentation of the SE Oman continental margin: results from ODP Leg 117 / Geological Society, London, Special Publications, 49:745-758, doi:10.1144/GSL.SP.1992.049.01.45 --- G. B. Shimmield, N. B. Price, and T. F. Pedersen: The influence of hydrography, bathymetry and productivity on sediment type and composition of the Oman Margin and in the Northwest Arabian Sea / Geological Society, London, Special Publications, 49:759-769, doi:10.1144/GSL.SP.1992.049.01.46 --- Regional Tectonic Setting --- K. W. Glennie, M. W. Hughes Clarke, M. G. A. Boeuf, W. F. H. Pilaar, and B. M. Reinhardt: Inter-relationship of Makran-Oman Mountains belts of convergence / Geological Society, London, Special Publications, 49:773-786, doi:10.1144/GSL.SP.1992.049.01.47 --- R. Stoneley: The Arabian continental margin in Iran during the Late Cretaceous / Geological Society, London, Special Publications, 49:787-795, doi:10.1144/GSL.SP.1992.049.01.48 --- A. M. C. Şengör: A new model for the late Palaeozoic—Mesozoic tectonic evolution of Iran and implications for Oman / Geological Society, London, Special Publications, 49:797-831, doi:10.1144/GSL.SP.1992.049.01.49

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

Description / Table of Contents: Role of Fluids in Rock Deformation --- N. L. Carter, A. K. Kronenberg, J. V. Ross, and D. V. Wiltschko: Control of fluids on deformation of rocks / Geological Society, London, Special Publications, 54:1-13, doi:10.1144/GSL.SP.1990.054.01.01 --- Richard H. Sibson: Conditions for fault-valve behaviour / Geological Society, London, Special Publications, 54:15-28, doi:10.1144/GSL.SP.1990.054.01.02 --- James P. Evans: Textures, deformation mechanisms, and the role of fluids in the cataclastic deformation of granitic rocks / Geological Society, London, Special Publications, 54:29-39, doi:10.1144/GSL.SP.1990.054.01.03 --- Fracture and Faulting --- Susan M. Agar: Fracture evolution in the upper ocean crust: evidence from DSDP hole 504B / Geological Society, London, Special Publications, 54:41-50, doi:10.1144/GSL.SP.1990.054.01.04 --- Martin Casey and Gilles Wust: The calculation of bulk rheologies of structured materials and its application to brittle failure in shear / Geological Society, London, Special Publications, 54:51-55, doi:10.1144/GSL.SP.1990.054.01.05 --- S. J. D. Cox and L. Paterson: Damage development during rupture of heterogeneous brittle materials: a numerical study / Geological Society, London, Special Publications, 54:57-62, doi:10.1144/GSL.SP.1990.054.01.06 --- S. J. D. Cox: Velocity-dependent friction in a large direct shear experiment on gabbro / Geological Society, London, Special Publications, 54:63-70, doi:10.1144/GSL.SP.1990.054.01.07 --- Susan J. Hippler and Robert J. Knipe: The evolution of cataclastic fault rocks from a pre-existing mylonite / Geological Society, London, Special Publications, 54:71-79, doi:10.1144/GSL.SP.1990.054.01.08 --- Ian G. Main, Philip G. Meredith, Peter R. Sammonds, and Colin Jones: Influence of fractal flaw distributions on rock deformation in the brittle field / Geological Society, London, Special Publications, 54:81-96, doi:10.1144/GSL.SP.1990.054.01.09 --- G. Zulauf, G. Kleinschmidt, and O. Oncken: Brittle deformation and graphitic cataclasites in the pilot research well KTB-VB (Oberpfalz, FRG) / Geological Society, London, Special Publications, 54:97-103, doi:10.1144/GSL.SP.1990.054.01.10 --- Iain S. Stewart and Paul L. Hancock: Brecciation and fracturing within neotectonic normal fault zones in the Aegean region / Geological Society, London, Special Publications, 54:105-110, doi:10.1144/GSL.SP.1990.054.01.11 --- Teng-Fong Wong: Mechanical compaction and the brittle—ductile transition in porous sandstones / Geological Society, London, Special Publications, 54:111-122, doi:10.1144/GSL.SP.1990.054.01.12 --- Instabilities and Localization --- Russell K. Davies and Raymond C. Fletcher: Shear bands in a plastic layer at yield under combined shortening and shear: a model for the fault array in a duplex / Geological Society, London, Special Publications, 54:123-131, doi:10.1144/GSL.SP.1990.054.01.13 --- H. W. Green II and P. C. Burnley: The failure mechanism for deep-focus earthquakes / Geological Society, London, Special Publications, 54:133-141, doi:10.1144/GSL.SP.1990.054.01.14 --- B. E. Hobbs, H.-B. Mühlhaus, and A. Ord: Instability, softening and localization of deformation / Geological Society, London, Special Publications, 54:143-165, doi:10.1144/GSL.SP.1990.054.01.15 --- Eva M. Klaper: Reaction-enhanced formation of eclogite-facies shear zones in granulite-facies anorthosites / Geological Society, London, Special Publications, 54:167-173, doi:10.1144/GSL.SP.1990.054.01.16 --- David L. Olgaard: The role of second phase in localizing deformation / Geological Society, London, Special Publications, 54:175-181, doi:10.1144/GSL.SP.1990.054.01.17 --- A. Ord: Mechanical controls on dilatant shear zones / Geological Society, London, Special Publications, 54:183-192, doi:10.1144/GSL.SP.1990.054.01.18 --- E. Carrio-Schaffhauser, S. Raynaud, H. J. Latière, and F. Mazerolle: Propagation and localization of stylolites in limestones / Geological Society, London, Special Publications, 54:193-199, doi:10.1144/GSL.SP.1990.054.01.19 --- Flow Mechanisms and Flow Laws --- R. C. M. W. Franssen and C. J. Spiers: Deformation of polycrystalline salt in compression and in shear at 250–350°C / Geological Society, London, Special Publications, 54:201-213, doi:10.1144/GSL.SP.1990.054.01.20 --- C. J. Spiers, P. M. T. M. Schutjens, R. H. Brzesowsky, C. J. Peach, J. L. Liezenberg, and H. J. Zwart: Experimental determination of constitutive parameters governing creep of rocksalt by pressure solution / Geological Society, London, Special Publications, 54:215-227, doi:10.1144/GSL.SP.1990.054.01.21 --- Jane A. Gilotti and Joseph M. Hull: Phenomenological superplasticity in rocks / Geological Society, London, Special Publications, 54:229-240, doi:10.1144/GSL.SP.1990.054.01.22 --- Martin Burkhard: Ductile deformation mechanisms in micritic limestones naturally deformed at low temperatures (150–350°C) / Geological Society, London, Special Publications, 54:241-257, doi:10.1144/GSL.SP.1990.054.01.23 --- A. N. Walker, E. H. Rutter, and K. H. Brodie: Experimental study of grain-size sensitive flow of synthetic, hot-pressed calcite rocks / Geological Society, London, Special Publications, 54:259-284, doi:10.1144/GSL.SP.1990.054.01.24 --- J. H. P. De Bresser and C. J. Spiers: High-temperature deformation of calcite single crystals by r+ and f+ slip / Geological Society, London, Special Publications, 54:285-298, doi:10.1144/GSL.SP.1990.054.01.25 --- M. S. Paterson and F. C. Luan: Quartzite rheology under geological conditions / Geological Society, London, Special Publications, 54:299-307, doi:10.1144/GSL.SP.1990.054.01.26 --- David J. Prior, Robert J. Knipe, and Mark R. Handy: Estimates of the rates of microstructural changes in mylonites / Geological Society, London, Special Publications, 54:309-319, doi:10.1144/GSL.SP.1990.054.01.27 --- Werner Skrotzki: Microstructure in hornblende of a mylonitic amphibolite / Geological Society, London, Special Publications, 54:321-325, doi:10.1144/GSL.SP.1990.054.01.28 --- Joseph Clancy White: Albite deformation within a basal ophiolite shear zone / Geological Society, London, Special Publications, 54:327-333, doi:10.1144/GSL.SP.1990.054.01.29 --- Rock Fabrics --- R.D. Law: Crystallographic fabrics: a selective review of their applications to research in structural geology / Geological Society, London, Special Publications, 54:335-352, doi:10.1144/GSL.SP.1990.054.01.30 --- M. W. Jessell and G. S. Lister: A simulation of the temperature dependence of quartz fabrics / Geological Society, London, Special Publications, 54:353-362, doi:10.1144/GSL.SP.1990.054.01.31 --- Jin-Han Ree: High temperature deformation of octachloropropane: dynamic grain growth and lattice reorientation / Geological Society, London, Special Publications, 54:363-368, doi:10.1144/GSL.SP.1990.054.01.32 --- Niels Ø. Olesen and Niels-Henrik Schmidt: The SEM/ECP technique applied on twinned quartz crystals / Geological Society, London, Special Publications, 54:369-373, doi:10.1144/GSL.SP.1990.054.01.33 --- H. Schaeben, H. Siemes, S. Höfler, and G. Will: Practical application of entropy optimization in quantitative texture analysis / Geological Society, London, Special Publications, 54:375-381, doi:10.1144/GSL.SP.1990.054.01.34 --- Deformation of Weak Sediments --- Daniel E. Karig: Experimental and observational constraints on the mechanical behaviour in the toes of accretionary prisms / Geological Society, London, Special Publications, 54:383-398, doi:10.1144/GSL.SP.1990.054.01.35 --- N. A. Yassir: The undrained shear behaviour of fine-grained sediments / Geological Society, London, Special Publications, 54:399-404, doi:10.1144/GSL.SP.1990.054.01.36 --- P.A.R. Nell: Deformation in an accretionary melange, Alexander Island, Antarctica / Geological Society, London, Special Publications, 54:405-416, doi:10.1144/GSL.SP.1990.054.01.37 --- Kevin T. Pickering, Susan M. Agar, and David J. Prior: Vein structure and the role of pore fluids in early wet-sediment deformation, Late Miocene volcaniclastic rocks, Miura Group, SE Japan / Geological Society, London, Special Publications, 54:417-430, doi:10.1144/GSL.SP.1990.054.01.38 --- Experimental Modelling Using Analogue Materials --- Shumin Liu and John M. Dixon: Centrifuge modelling of thrust faulting: strain partitioning and sequence of thrusting in duplex structures / Geological Society, London, Special Publications, 54:431-444, doi:10.1144/GSL.SP.1990.054.01.39 --- K. R. McClay: Deformation mechanics in analogue models of extensional fault systems / Geological Society, London, Special Publications, 54:445-453, doi:10.1144/GSL.SP.1990.054.01.40 --- C. J. L. Wilson and Thomas M. Will: Slickenside lineations due to ductile processes / Geological Society, London, Special Publications, 54:455-460, doi:10.1144/GSL.SP.1990.054.01.41 --- Deformation Mechanisms and Tectonics --- J. P. Gratier and J. F. Gamond: Transition between seismic and aseismic deformation in the upper crust / Geological Society, London, Special Publications, 54:461-473, doi:10.1144/GSL.SP.1990.054.01.42 --- Massimo Coli and Federico Sani: Vein distribution in a thrust zone: a case history from the Northern Apennines, Italy / Geological Society, London, Special Publications, 54:475-482, doi:10.1144/GSL.SP.1990.054.01.43 --- Federico Sani: Extensional veins and shear joint development in a thrust-fold zone (Northern Apennines, Italy) / Geological Society, London, Special Publications, 54:483-490, doi:10.1144/GSL.SP.1990.054.01.44 --- Robert E. Holdsworth and Colin J. Grant: Convergence-related ‘dynamic spreading’ in a mid-crustal ductile thrust zone: a possible orogenic wedge model / Geological Society, London, Special Publications, 54:491-500, doi:10.1144/GSL.SP.1990.054.01.45 --- J. E. Iliffe, I. Lerche, and K. Nakayama: Structural implications of compactional strain caused by fault block rotation: evidence from two-dimensional numerical analogues / Geological Society, London, Special Publications, 54:501-507, doi:10.1144/GSL.SP.1990.054.01.46 --- J. L. Urai, R. D. Schuiling, and J. B. H. Jansen: Alpine deformation on Naxos (Greece) / Geological Society, London, Special Publications, 54:509-522, doi:10.1144/GSL.SP.1990.054.01.47

Description / Table of Contents: Knowledge of the relation between sonic velocity in sediments and rock lithology is one of the keys to interpreting data from seismic sections or from acoustic logs of sedimentary sequences. Reliable correlations of rock velocity with other petrophysical parameters, such as porosity or density, are essential for calculating impedance models for synthetic seismic sections (BIDDLE et al. , 1992; CAMPBELL and STAFLEU, 1992) or identifying the origin of reflectivity on seismic lines (SELLAMI et al. , 1990; CHRISTENSEN and SZYMANSKI, 1991). Velocity is thus an important parameter for correlating lithological with geophysical data. Recent studies have increased our understanding of elastic rock properties in siliciclastic or shaly sediments. The causes for variations in velocity have been investigated for siliciclastic rocks (VERNIK and NUR, 1992), mixed carbonate siliciclastic sediments (CHRISTENSEN and SZYMANSKI, 1991), synthetic sand-clay mixtures (MARION et aI. , 1992) or claystones (JAPSEN, 1993). The concepts derived from these studies are however only partly applicable in pure carbonates. Carbon­ ates do not have large compositional variations that are, as is the case in the other sedimentary rocks, responsible for velocity contrasts. Pure carbonates are character­ ized by the lack of any clay or siliciclastic content, but are mostly produced and deposited on the top or on the slope of isolated or detached carbonate platforms, that have no hinterland as a source of terrigeneous material (WILSON, 1975; EBERLI, 1991).