ALBERT

Description / Table of Contents: PREFACE It was only during the last few years, that the geological effects of storms and hurricanes in shallow-marine environments have been better appreciated. Not only were storm deposits recognized to dominate many shelf sequences, they also proved to be valuable tools in facies and paleogeographical analysis. Additionally, storm layers form important hydrocarbon reservoirs. Storm-generated sequences are now reasonably mell documented in terms of their facies associations in the stratigraphic record. Much less is known, however, about the effects and the depositional processes of modern storms, and about the styles of storm sedimentation on basinwide scales. Accordingly, the goal of this study is two-fold: 1. it presents two case studies of modern carbonate and terrigenous clastics storm sedimentatioq. The models derived from these actualistic examples can be used to interprete possible ancient analogues. 2. it presents a comprehensive analysis of an ancient storm depositional system (Muschelkalk) on a basin-wide scale. The underlying approach of this study is a process-oriented analysis of sedimentary sequences, an approach that ~as summarized by Matthews (1974, 1984) as "dynamic stratigraphy". The integration of actualistic models with a "dynamic" stratigraphic analysis helps to understand the dynamics of storm depositional systems; these models have a potential to be applied to other basins and to predict the facies organisation and the facies evolution in such systems...

Description / Table of Contents: INTRODUCTION While the complex mechanical properties of rocks and soils are studied for quite a while, it is only in the last decades that sound established mathematical models were developed based on accurate experimental data. Some rheological properties of geomaterials as for instance creep, were studied for a long time but the experimental data reported were incomplete and, as a consequence, the models developed have missed either the generality necessary for the solving of engineering problems or some of the major specific mechanical properties possessed by these materials as for instance dilatancy and/or compressibility , long term damage etc. Generally, these very particular empirical models were made for a specific test only and therefore are not appropriate for solving problems involving general loading histories. Let us remind that due to the presence of a great number of cracks and/or pores existing in roks and soils, the mechanical behaviour of geomaterials is quite distinct from that of other materials as for instance metals or plastics. That is why rock and soil rheology has some specific aspects. It must also be mentioned that the solving of various problems of rock and soil mechanics posed by modern technology was not possible by using time-independent models, thus the study and development of rehological models become absolutely necessary. In the last decade or so, very accurate experimantal data became available as a result of the development of experimental techniques and of the growing interest for this field of research in the scientific community. These data, in turn, have made possible the development of genuine models for geomaterials, mainly rheological models, able to describe such properties as creep, dilatancy and/or compressibility during creep, long term damage and failure occurring after various time intervals, slip surface formation etc. Today it is clear that no accurate constitutive equation for rocks can be formulated unless the dilatancy phenomena and the time effects are not included. Another idea is the need of a better description of the concepts of damage and failure of rocks, again using in someway the concepts of irreversible dilatancy or another related notion. In soil rheology it is clear that the scale effect may be taken into consideration in order to obtain a corect information from the routine tests. Also in writing the constitutive equations for soils it is neccessary to take into account the microscopic or local phenomena, because there is a great variety of types of saturated or nonsaturated soils, granular or cohesionless soil etc. The aim of the Euromech Colloquium 196 devoted to Rock and Soil Rheology and therefore that of the present volume too, is to review some of the main results obtained in the last years in this field of research and also to formulate some of the major not yet solved problems which are now under consideration. Exchange of opinions and scientific discussions are quite helpful mainly in those areas where some approaches are controversial and the progress made is quite fast. That is especially true for the rheology of geomaterials, domain of great interest for mining and petroleum engineers, engineering geology, seismology, geophlsics, civil engineering, nuclear and industrial waste storage, geothermal energy storage, caverns for sports, culture, telecommunications, storage of goods and foodstuffs (cold, hot and refrigerated storages), underground oil and natural gas reservoirs etc. Some of the last obtained results are mentioned in the present volume...

Description / Table of Contents: INTRODUCTION In the context of evolutionary studies, it is the privilege of paleontologists to trace the actual course of evolutionary change over time spans that are adequate for such a slow process. At the same time it is their crux that they can not always hope to do this with the resolution necessary to reveal the causal relationships involved. The Tübingen Sonderforschungsbereich 53, "Palökologie", was primarily geared to study the interrelationships between organisms and environments in the fossil record. As is pointed out in this volume, such an approach will necessarily emphasize the static aspect of this relationship, all the more since this is what we need for the practical purposes of facies recognition. This was clone during a time interval of thirteen years at the level of individual species and taxonomic groups ("Konstruktions-Morphologie"), of characteristic facies complexes ("Fossil-Lagerstätten") and of assemblages ("Fossil- VergeseIlschaftungen") with the aim to recognize general patterns that persist in spite of the historical and evolutionary changes in the biosphere. But as our project came closer to its end, the possible causal relationships between physical and evolutionary changes became more tangible. This trend is expressed by symposia devoted to the biological effects of long term tectonic changes (KULLMANN & SCHÖNENBERG, eds., 1983) and of short term physical events (EINSELE & SEILACHER, eds., 1982). But in retrospect it appears that the time scales of the environmental changes chosen were either too large or too small to reveal the mechanisms of evolutionary response. The present volume is the outcome of a symposium of the projects B 20 ("Bankungsrhythmen in sedimentologischer, ökologischer und diagenetischer Sicht", directed by U. BAYER), D 40 ("Analoge Gehäuse-Aberrationen bei Ammonoideen", directed by J. WIEDMANN) and D 60 ("Substratwechsel im marinen Benthos", directed by A. SEILACHER) in September, 1983. tt addresses environmental changes at time scales large enough to produce more than a local ecological response and short enough to observe evolutionary and/or migratory changes at the species and genus levels. It also focusses on basins which by various degrees of isolation provided suitable sites for "evolutionary experiments", such as lakes and marginal epicontinental basins. In a way, this book is a successor of the previous one on "Cyclic and event stratification" (EINSELE & SEILACHER, eds., 1982). Small scale cycles and events are the 'primitives' of a sedimentary sequence, the lowermost scale from which it can be deciphered. However, medium and long term physical cycles commonly impress sedimentological and lithological trends on the stratigraphic column which are accompanied by faunal replacements and cycles. But since sedimentation is controlled both by physical and biological processes, which are intercorrelated in complicated ways, we also need to decode the stratigraphic text. In this effort, paleontological and sedimentological interpretation must go hand in hand. On the 'megascale' of global sea-level changes faunal and species evolution is triggered by opening and closing of migration pathways, sometimes providing us with malor biostratigraphic boundaries. As it turns out, however, integrated research and the choice of suitable scales do not free us from problems of resolution. Thus our inability to distinguish local speciation from ecophenotypic modification and from immigration in the fossil record excludes definite evolutionary answers even in well studied cases. Nevertheless we hope that this approach opens a fruitful discussion, in which stratigraphy, systematic paleontology and paleoecology will be reconciled in a concerted effort to eventually understand the evolutionary mechanisms of our biosphere.

Description / Table of Contents: PREFACE It is to-day generally recognized by environmental scientists that the particular behaviour of trace metals in the environment is determined by their specific physico-chemical forms rather than by their total concentration. With the introduction, several years ago, of atomic absorption spectrometry at many laboratories involved in environmental studies, a technique for simple, rapid and cheap determination of total metal concentrations in environmental samples became available. As a consequence, there is a plethora of scientific papers and reports where metal concentrations in the environment are only reported as total concentrations. It appears that the simplicity of making accurate determinations of total metal contents in water, sediment and biological samples has somewhat masked the need for improved knowledge about the various forms of metals occurring in the environment as well as the bioavailahility of these forms. In other words, the need for metal speciation in studies of metals in the environment does not seem to have become obvious to most environmental scientists until relatively recently. As a matter of fact, it was only in the middle of the 1970s that the first systematic attempts were made to obtain information about the various metal species occurring in environmental samples. During the last ten years, however, a revolutionary change of attitude towards the importance of metal speciation has occurred and considerable research effort has been devoted by environmental scientists to measuring the concentrations of biologically important trace metals in surface waters. There is currently an increasing effort to couple the development of chemical analytical techniques to process-related biological problems. Concurrently, a new focus is being imposed on ecological impact studies, that of determining which active trace metal species merit the most intensive research from the standpoint of environmental perturbation. Current efforts are directed towards the development of chemical speciation schemes which can be related directly to measures of bioavailability...

Description / Table of Contents: INTRODUCTION Over the past 18 years the author and several colleagues have developed a mathematical model designed to predict the propagation characteristics of acoustic waves in marine sediments. The model is based on the classical work of Maurice Biot who developed a comprehensive theory for the mechanics of porous, deformable media in a series of papers spanning the time period from 1941 to 1973. Since our objective was to develop a practical working model that could be used as a guide in planning and interpreting experimental work, we began with the simplest possible form of the model and added various complexities only as they were needed to explain new variations in the data that were obtained. Thus the number of material parameters that had to be measured or assumed at any stage in the development of the model was kept to a minimum. Since the first version of the model was introduced in 1970, we have published over twenty technical papers covering various stages of its development and many papers have been published by colleagues who have utilized our work in various ways. This monograph is an attempt to summarize the development and use of the model to date. Acoustic waves in ocean sediments may be considered as a limiting case in the more general category of mechanical waves that can propagate in fluid-saturated porous media. The general problem of wave motion in this kind of material has been studied extensively over the past thirty years by engineers, geophysicists and acousticians for a variety of reasons. In some cases, interest is focused on low-frequency waves of rather large amplitude, such as those that arise near the source of an earthquake or near a building housing heavy, vibrating machinery. At other times, the main interest is in waves of low frequency and amplitude that have traversed long distances through the sediment. In still another category, high-frequency waves that are able to resolve thin layering and other fine structural details are of interest in studying near-bottom sediments. Thus the full spread of frequency and amplitude has been studied for geological materials ranging from soft, unconsolidated sediments to rock. Because of the almost limitless combinations of different types of sediment, stratification and structure, accurate mathematical description of the wave field produced by a particular source can be constructed only if accurate descriptions of the acoustic properties of individual components can be specified. These properties depend on the geological history of the sediment deposit, on the frequency content of the wave field and on a number of other factors that depend on the environment in situ. A survey of the literature suggests that there are a number of parameters that play principal roles in controlling the dynamic response of saturated sediments...

Description / Table of Contents: INTRODUCTION Evaporites may form in a spectrum of environments from continental sabkha (playa) to deep basins (see Kendall 1978 a, b, Schreiber 1978, 1986, Friedman and Krumbein 1985, for review). In the last two decades, many ancient evaporite basins have been interpreted using the sabkha model and the deep desiccated basin model, the former not excluding the latter. However, growing evidence has been gathered indicating that most evaporites are formed in subaqueous environments, so that it cannot be reasonably expected that one depositional model alone will explain the entire basin fill. The chapters in this volume discuss characteristic examples of evaporite basins, mostly of moderate size. Aspects of a saline giant, the Zechstein basin of Central and NW Europe, have been considered in Volume 10 of "Lecture Notes in Earth Sciences"...

Description / Table of Contents: Chapter 1: SEDIMENTARY PROCESSES --- Architectural Elements and Bounding Surfaces in Channelized Clastic Deposits: Notes on Comparisons between Fluvial and Turbidite Systems / A. D. MIALL / pp. 3-15 --- A Simulation of Basin Margin Sedimentation to Infer Geometry and Lithofacies—A Carbonate Example— / K. NAKAYAMA and C. G. St. C. KENDALL / pp. 17-31 --- Gravel Fabric of Clast-Supported Resedimented Conglomerate / K. YAGISHITA / pp. 33-42 --- Magnetic Fabrics and Depositional Processes / A. TAIRA / pp. 43-77 --- Chapter 2: FLUVIAL TO COASTAL FACIES --- Sedimentation in Coarse-Grained Sand-Bedded Meanders: Distinctive Deposition of Suspended Sediment / F. ISEYA and H. IKEDA / pp. 81-112 --- Mechanism of Inverse Grading of Suspended Load Deposits / F. ISEYA / pp. 113-129 --- Coastal Eolian Dune Deposits of the Pleistocene Shimosa Group in Chiba, Japan / H. NAKAZATO, H. SATO, and F. MASUDA / pp. 131-141 --- Synsedimentary Conjugate Faults in the Pleistocene Tidal Deposits at Ushibori, Ibaraki, Japan / H. AONO and F. MASUDA / pp. 143-149 --- Description and Genesis of Tidal Bedding in the Cobequid Bay-Salmon River Estuary, Bay of Fundy, Canada / R. W. DALRYMPLE and Y. MAKINO / pp. 151-177 --- Petrofacies of Paleo-Tokyo Bay Sands, the Upper Pleistocene of Central Honshu, Japan / M.ITO and F.MASUDA / pp. 179-196 --- Faunal Condensation in Early Phases of Glacio-Eustatic Sea-Level Rise, Found in the Middle to Late Pleistocene Shimosa Group, Boso Peninsula, Central Japan / Y. KONDO / pp. 197-212 --- Chapter 3: SHALLOW MARINE FACIES --- Sedimentology and History of Sea Level Changes in the East China Sea and Adjacent Seas / B.-C. SUK / pp. 215-231 --- Sediments and Sedimentary Processes in the Yellow and East China Seas / J. D. MILLIMAN, Y. S. QIN, and Y. A. PARK / pp. 233-249 --- Bedforms and Their Migration Patterns in the Southern Bungo Strait, Japan / K. IKEHARA and Y. KIN05HITA / pp. 251-260 --- The Kuroshio-Generated Bedform System in the Osumi Strait, Southern Kyushu, Japan / K. IKEHARA / pp. 261-273 --- Ocean Current-Controlled Sedimentary Facies of the Pleistocene Ichijiku Formation, Kazusa Group, Boso Peninsula, Japan / N. NAKAYAMA and F. MASUDA / pp. 275-293 --- Multi-Layered Progradational Sequences in the Shelf and Shelf Slope of the Southwest Japan Forearc / Y. OKAMURA / pp. 295-318 --- Storm-Built Sand Ridges on the Inner Shelf of Kashima-Nada, Northeast Japan / Y. SAITO / pp. 319-330 --- Storm Deposits in the Inner Shelf and Their Recurrence Intervals, Sendai Bay, Northeast Japan / Modern Y. SAITO / pp. 331-344 --- Sea-Level Controlled Shallow-Marine Systems in the Plio-Pleistocene Kakegawa Group, Shizuoka, Central Honshu, Japan: Comparison of Transgressive and Regressive Phases / M. ISHIBASHI / pp. 345-363 --- Coarse Clastic Sedimentation in the Triassic Offshore Sequence of the South- eastern Kitakami Mountains, Japan / K. KAMADA / pp. 365-375 --- Depositional Facies of the Viséan (Carboniferous) Limestones in the South Kitakami Terrane, Northeast Japan / T. KAWAMURA / pp. 377-391 --- Chapter 4: SLOPE TO DEEP-WATER FACIES --- Depositional Scheme of Neogene Bedded Siliceous Rocks in an Active Upwelling Area-On the Wakkanai Formation, Northern Hokkaido, Japan / H. FUKUSAWA / pp. 395-419 --- Turbidites and Related Clastic Systems in the Tertiary Chichibu Basin, Central Japan / K. M. LATT / pp. 421-438 --- Two Stages of Submarine Fan Sedimentation in an Ancient Forearc Basin, Central Japan / S. TOKUHASHI / pp. 439-468 --- Synsedimentary Folding of a Sandstone Layer: Paleoslope Deduced from the Folding Process / M. FUSEYA / pp. 469-481 --- Miocene Offshore Tractive Current-Worked Conglomerates—Tsubutegaura, Chita Peninsula, Central Japan— / T. YAMAZAKI, M. YAMAOKA, and T. SHIKI / pp. 483-494 --- Coarse Clast Dominant Submarine Debrite, the Mio-Pliocene Fujikawa Group, Central Japan / W. SOH / pp. 495-510 --- Basal Structures of the Pleistocene Chikura Submarine Sliding Sheet in the Southernmost Boso Peninsula, Central Japan / T. ITO and S. SUGIYAMA / pp. 511-528 --- Topography and Sedimentary Facies of the Nankai Deep Sea Channel / K. SHIMAMURA / pp. 529-556 --- Ancient Trench-Fill and Trench-Slope Basin Deposits: An Example from the Permian Nishiki Group, Southwest Japan / A. HARA and K. KIMINAMI / pp. 557-575 --- Tectono-Sedimentary Settings of Seep Biological Communities—A Synthesis from the Japanese Subduction Zones— / K. FUJIOKA and A. TAIRA / pp. 577-602 --- Chapter 5: VOLCANIC FACIES --- Sedimentary Facies of the Mio-Pliocene Volcanotectonic Depressions along the Volcanic Front in Northeast Honshu, Japan / M. UTADA and T. ITO / pp. 605-618 --- Submarine Depositional Processes for Volcaniclastic Sediments in the Mio- Pliocene Misaki Formation, Miura Group, Central Japan / W. SOH, A. TAIRA, Y. OGAWA, H. TANIGUCHI, K. T. PICKERING, and D. A. V. STOW / pp. 619-630 --- Chapter 6: TECTONICS AND SEDIMENTATION --- Upper Cretaceous-Paleogene Kuji Basin of Northeast Japan: Tectonic Controls on Strike-Slip Basin Sedimentation / K. MINOURA and H. YAMAUCHI / pp. 633-658 --- The Itsukaichimachi Group: A Middle Miocene Strike-Slip Basin-Fill in the Southeastern Margin of the Kanto Mountains, Central Honshu, Japan / M. ITO / pp. 659-673 --- Structural Control on Sedimentation of Coal-Bearing Formations in Japan / K. FUJII / pp. 675-688 --- Coarse-Grained Turbidite Sedimentation Resulting from the Miocene Collision Event in Central Hokkaido, Japan / K. HOYANAGI / pp. 689-709 --- Eocene Foreland Thrust-Fold Belt of the Central Ryukyu Island Arc: Deduced from Sedimentary Structures in the Kayo Formation / H. UJIIE / pp. 711-722 --- Rifting of the Gondwanaland and Uplifting of the Himalayas Recorded in Mesozoic and Tertiary Fluvial Sediments in the Nepal Himalayas / H. SAKAI / pp. 723-732

Description / Table of Contents: PREFACE During the so-called Mid-Cretaceous interval, approximately 100 million years ago, the earth experienced a dynamic phase in its geologic history. Enhanced global tectonic activity resulted in a major rearrangment of the continental plates; accelerated spreading rates induced a first-order sea level highstand; intense off-ridge volcanism contributed to a modeled high atmospheric CO 2 rate; climatic conditions fluctuated; and major changes occurred in biologic evolutionary patterns. With the initiation of a gradual change from an equatorial, east-west directed current-circulation pattern to a regime, dominated by south-north and north-south directed current systems, the earth's internal clock was set for Cenozoic, "modern" times. The Mid-Cretaceous dynamic phase is recorded in a suite of sediments of remarkable similarity around the globe. Shallow-water carbonate platforms drowned on a global scale; widespread sediment-starved, glauconite and phosphate- rich sequences developed; and consequently, pelagic sedimentary regimes "invaded" shelf and epicontinental sea areas. This typical "deepening-upward" pattern is well-documented in Mid-Cretaceous sequences along the northern Tethys margin. Shallow-water carbonates are overlain by condensed glauconitic and phosphatic sediments, which, in turn, are blanketed by pelagic carbonates. In this volume, the example of the western Austrian helvetic Alps, built up of inner and outer shelf sediments deposited along the northern Tethys margin, is used to elucidate the paleoceanographic conditions, under which the Mid-Cretaceous triad of platform carbonates, condensed phosphatic and glauconitic sediments, and pelagic carbonates was formed. In the first part, the evolution of this sequence is traced from the demise of the platform (Aptian) to the return of detritus-dominated deposition (Upper Santonian). The second part includes a discussion of the reconstructed paleoceanographic and tectonic variables, their possible interaction, as well as their influence on sediment properties during this period. Special attention is paid to (1) subsidence behavior of the inner, platform-based shelf and the outer shelf beyond the platform, (2) ammonoid paleobiogeography, (3) the northern tethyan current system and its impact on sediment patterns, (4) the influence of an oxygen minimum zone, (5) sediment bypassing mechanisms on the inner shelf, (6) condensation processes, (7) phosphogenesis, (8) relative sea level changes, (9) genesis and the development of unconformities, (10) tectonic phases and their impact on sediment configuration, (11) drowning of the shallow-water carbonate platform, and (12) "asymmetric" sedimentary cycles. The detailed reconstruction of the development of sedimentary patterns both in time and space in this particular area, and its environmental interpretation, given in this volume, may serve as a contribution to a better understanding of the Mid-Cretaceous dynamic phase in earth's history...