ALBERT

Description / Table of Contents: The scientist will be forced, in the unenthusiastic words of one of my scientific colleagues, "to slosh about in the primordial ooze known as inter-disciplinary studies". John Passmore Man’s responsibility for nature The present text has arisen from some thirteen years advances in our perception, appraisal and creative use of collaboration between the two authors. During that of order in natural systems. Out of this can come period, upwards of a dozen postgraduates in enhanced insight into processes, structures and Edinburgh, the New University of Ulster and Liver systems interactions on all temporal and spatial scales pool have been closely involved in exploring many of and at all integrative levels from subatomic to cosmic. the applications of magnetic measurements described In the environment, elements of order are often in the second half of the book. Much of the text is difficult to appraise and analyse, not only because of based on their work, both published and unpublished. intrinsic complexity, but as a consequence of our lack A great deal of the work summarised reflects extensive of techniques, instrumentation and suitable co-operation not only between the authors and among methodologies. Magnetic properties, whether natural their postgraduate groups, but also involving or induced, reflect forms of order which, in recent colleagues in geology, geography, ecology, hydrology, years, have become dramatically more accessible to a meteorology, glaciology, archaeology, limnology, growing range of instruments and techniques.

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...

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: PREFACE The emergence of new information from drilling in deep-sea and coastal areas and the surfacing of the plate tectonics theory probably had the greatest impacts in recent decades on the highly accelerated growth of knowledge regarding the evolution of sediments and sedimentary rocks. Studies in recent years have also provided new insights on global sedimentary processes, and isotopic tools in many ways have enhanced our knowledge and have provided even an unexpected added dimension to the mechanisms of some specific processes. Many different uses of isotopic tools in studies of sedimentary processes can be found in the literature, but the information is highly scattered in the vast field of sedimentology. The disseminated state of existing isotopic knowledge on sedimentary systems has undoubtedly deprived many practitioners in the field to fully appreciate the benefits and limitations, and even the apparent confusion, concerning the use of isotopic tools. We have endeavored here to bring together discussions on some major sedimentary systems in the sedimentary cycle and to analyze them according to isotopic evidence. To accomplish such a task required contributions from many individuals. We were fortunate to have friends who accepted to share our goals. We most sincerely thank all the contributors to this book and deeply appreciate their patience and fortitude despite our undue demands on them to reach our objectives...

Description / Table of Contents: INTRODUCTION --- Shock Compression Chemistry of materials, Y. Horie and A. B. Sawaoka, pp. 3-22 --- 1.1 The Nature of Shock Waves, pp. 3-5 --- 1.2 Compaction of Powders and Shock Activation, pp. 6-9 --- 1.3 First-Order Phase Transitions and Chemical Reactions, pp. 10-12 --- 1.4 Time Scales and Interactions of Basic Mechanisms, p. 12 --- 1.4.1 Shock propagation in a particle assemblage, p. 12 --- 1.4.2 Energy localization, pp. 12-13 --- 1.4.3 Thermal relaxation of hot spots, p. 14 --- 1.4.4 Mass diffusion in solids, p. 14 --- 1.4.5 Kinetic constants, pp. 14-16 --- 1.5 Some Roles of Shock Compression Techniques in Material Sciences Study, p. 16 --- 1.5.1 Shock compression technique as a tool of high pressure production, p. 16 --- 1.5.2 Appearance of diamond anvil-type high-pressure apparatus, pp. 16-18 --- 1.5.3 New roles of shock compression technology as a unique method of very high temperature production, pp. 18-19 --- 1.5.4 Development of conventional hypervelocity impact techniques for precise measurement of materials under shock compression, pp. 19-21 --- FUNDAMENTALS OF SHOCK WAVE PROPAGATION --- Shock Compression Chemistry of materials, Y. Horie and A. B. Sawaoka, pp. 23-78 --- 2.1 Hydrodynamic Jump Conditions and the Hugoniot Curve, pp. 23-32 --- 2.2 Shock Transition in Hydrodynamic Solids, pp. 32-42 --- 2.3 Non-Hydrostatic Deformation of Solids, p. 42 --- 2.3.1 Elastic-ideally-plastic solids, pp. 42-53 --- 2.3.2 Experimental observations of elastic-plastic behavior, pp. 53-56 --- 2.4 Wave-body interactions, pp. 56-57 --- 2.4.1 Preliminaries, pp. 57-60 --- 2.4.2 Planar impact of similar and dissimilar bodies, pp. 60-61 --- 2.4.3 Shock wave interaction with material boundaries, pp. 61-64 --- 2.4.4 Wave-wave interactions, pp. 65-66 --- 2.4.5 Detonation wave and interaction with a solid surface, pp. 66-77 --- SHOCK COMPRESSION TECHNOLOGY --- Shock Compression Chemistry of materials, Y. Horie and A. B. Sawaoka, pp. 79-115 --- 3.1 Gun Techniques, p. 80 --- 3.1.1 Single stage gun, p. 80 --- 3.1.2 Conventional two stage light gas gun, pp. 80-83 --- 3.1.3 Velocity measurement of projectile, p. 83 --- 3.1.4 Magnetoflyer method, pp. 83-84 --- 3.1.5 CW x-ray velocity meter, pp. 84-86 --- 3.1.6 Measurement of interior projectile motion, pp. 86-87 --- 3.1.7 Recovery experiments, pp. 87-89 --- 3.2 Explosive Techniques, p. 89 --- 3.2.1 Plane shock wave generation and recovery fixture, pp. 89-91 --- 3.2.2 Numerical simulaation of shock compression in the recovery capsule, pp. 91-94 --- 3.2.3 Cylindrical recovery fixture, pp. 94-95 --- 3.3 In-situ Measurements, p. 95 --- 3.3.1 Manganin pressure gauge, pp. 95-98 --- 3.3.2 Particle velocity gauge, pp. 99-100 --- 3.3.3 Observations of multiple shock reverberations by using a manganin pressure gauge and particle velocity gauge, pp. 100-106 --- 3.3.4 Shock temperature measurement, pp. 106-111 --- 3.3.5 Copper-Constantan thermocouple as a temperature and pressure gauge, pp. 111-113 --- THERMOMECHANICS OF POWDER COMPACTION AND MASS MIXING --- Shock Compression Chemistry of materials, Y. Horie and A. B. Sawaoka, pp. 117-170 --- 4.1 A One Dimensional Particulate Model, pp. 117-123 --- 4.2 Continuum Models, p. 123 --- 4.2.1 Hydrodynamic models, pp. 124-141 --- 4.2.2 Continuum plasticity theory, pp. 141-148 --- 4.2.3 Application, pp. 148-154 --- 4.3 Particle Bonding and Heterogeneous Processes, pp. 154-160 --- 4.4 Mass Mixing, pp. 160-169 --- THERMOCHEMISTRY OF HETEROGENEOUS MIXTURES --- Shock Compression Chemistry of materials, Y. Horie and A. B. Sawaoka, pp. 171-225 --- 5.1 Thermodynamic Functions of Heterogeneous Mixtures, pp. 172-187 --- 5.2 Analytical Equations of State, pp. 187-191 --- 5.3 Hugoniots of Inert Mixtures, p. 191 --- 5.3.1 Thermodynamically equilibrium models, pp. 191-197 --- 5.3.2 Mechanical models, pp. 197-199 --- 5.4 First-Order Phase Transitions, pp. 199-206 --- 5.5 Chemical Equilibria, pp. 206-212 --- 5.6 Reaction Kinetics, p. 212 --- 5.6.1 Rate equations, pp. 212-214 --- 5.6.2 Nucleation, pp. 214-216 --- 5.6.3 Growth, pp. 216-217 --- 5.6.4 Pressure effects, pp. 217-218 --- 5.7 Shock-Induced Reactions in Powder Mixtures, pp. 218-224 --- HYDRODYNAMICAL CALCULATIONS --- Shock Compression Chemistry of materials, Y. Horie and A. B. Sawaoka, pp. 227-276 --- 6.1 Conservation Equations of Continuum Flow, pp. 227-228 --- 6.1.1 Mass conservation, pp. 228-230 --- 6.1.2 Conservation of linear momentum, pp. 230-231 --- 6.1.3 Enegy conservation, pp. 231-234 --- 6.2 Constitutive Modeling of Inorganic Shock Chemistry, pp. 234-235 --- 6.2.1 VIR model, pp. 235-239 --- 6.2.2 Pore collapse, p. 239 --- 6.2.3 Chemical kinetics, pp. 239-240 --- 6.2.4 Computational constitutive reactions, pp. 240-245 --- 6.3 Applications of the VIR Model, p. 245 --- 6.3.1 Shock wave profiles in Ni/Al powder mixtures, pp. 245-250 --- 6.3.2 Compaction of diamond with Si and graphite, pp. 250-257 --- 6.4 Continuum Mixture Theory and the VIR Model, p. 257 --- 6.4.1 Continuum mixture theory, pp. 257-263 --- 6.4.2 Derivation of the VIR model using the CMT, pp. 263-269 --- 6.4.3 A model of heterogeneous flow, pp. 269-275 --- SHOCK CONDITIONING AND PROCESSING OF CERAMICS --- Shock Compression Chemistry of materials, Y. Horie and A. B. Sawaoka, pp. 277-360 --- 7.1 Shock Conditioning of Powder of Inorganic Materials, p. 227 --- 7.1.1 Brief review of shock conditioning studies, p. 227 --- 7.1.2 Aluminum oxide powder, pp. 277-281 --- 7.2 Shock Synthesis of Inorganic Materials, p. 281 --- 7.2.1 Shock synthesis studies, p. 281 --- 7.2.2 High dense forms of carbon, pp. 281-285 --- 7.2.3 High dense forms of boron nitride, pp. 285-287 --- 7.2.4 Shock treatment of boron nitride powders, pp. 287-301 --- 7.3 Shock Consolidation of Ceramic Powders, p. 301 --- 7.3.1 Why non-oxide ceramics?, pp. 301-302 --- 7.3.2 Dynamic consolidation of SiC powders, pp. 302-304 --- 7.3.3 Approach to the fabrication of crack free compacts, pp. 304-305 --- 7.3.4 Shock consolidation of SiC powder utilizing post shock heating by exothermic reaction, pp. 305-310 --- 7.4 Dynamic Compaction of Zinc Blende Type Boron Nitride and Diamond Powders, p. 310 --- 7.4.1 Background, pp. 310-311 --- 7.4.2 Cubic boron nitride, pp. 311-318 --- 7.4.3 Diamond, pp. 318-326 --- 7.4.4 Diamond composites obtained by utilizzing exothermic chemical reaction, pp. 326-332 --- 7.5 Very High Pressure Sintering of Shock Treated Powders, pp. 332-334 --- 7.5.1 Silicon nitride, pp. 334-336 --- 7.5.2 w-BN, pp. 336-346 --- 7.6 Rapid Condensation of High Temperature Ultrasupersaturated Gas, p. 346 --- 7.6.1 Silicon nitride, pp. 346-352 --- 7.6.2 Carbon, pp. 352-357