الصفحة 1
الصفحة 1
High-Latitude Bioerosion : The Kosterfjord Experiment
Bioerosion is the major force driving the degradation of marine skeletal carbonates and limestone coasts. A wide spectrum of mechanical and/or chemical boring, scraping or crushing organisms break down calcereous substrates, comprising various grazers, macroborers and especially microborers. Their traces on and within hard substrates are known from fossil carbonates as old as the Precambrian and serve as valuable palaeoenvironmental indicators. Bioerosion processes have been extensively studied in tropical seas, while corrsponding investigations from cold-temperate to polar settings remain sparse. For the first time, an experimental study yields insight into the pace of carbonate degradation and the chronology of boring community development along a bathymetric gradient in a high-latitude setting.
Deep-water Coral Reefs : Unique Biodiversity Hot-Spots
Provides a useful overview of various aspects of deep-water coral reefs and carbonate mounds, providing insights into the physical processes, and inspire and stimulate further research into these fascinating natural systems. This book, presents and discusses only a selection of the world’s discovered deep-water coral reefs.
Current Developments in Bioerosion
The book opens with papers on the evolutionary significance of bioerosion, and subsequently ventures out to explore the remarkable diversity of bioerosive biota. From microboring bacteria to grazing echinoids, the studies use a variety of techniques ranging from field observations to sophisticated micro-computed tomography to investigate the ecological and environmental role of these organisms, including symbiotic interactions and alteration of non-carbonate substrates.
Cold-Water Corals and Ecosystems
Following the exciting exploration of hot vent and cold seep ecosystems, the rediscovery of cold-water coral ecosystems with high-technology instrumentation is currently another hot topic in multidisciplinary marine research. Conventionally, coral reefs are regarded as restricted to warm and well-illuminated tropical seas, not associated with cold and dark waters of higher latitudes. However, ongoing scientific missions have shed light on the global significance of this overlooked ecosystem. Cold-water coral ecosystems are involved in the formation of large seabed structures such as reefs and giant carbonate mounds, and they represent unexploited paleo-environmental archives of earth history. Like their tropical cousins, cold-water coral ecosystems harbour rich species diversity. Despite the great water depths, commercial interests overlap more and more with the coral occurrences. Human activities already impinge directly on cold-water coral reefs causing severe damage to this vulnerable ecosystem. In this volume, the current key institutions involved in cold-water coral research have contributed 62 state-of-the-art articles from geology and oceanography to biology and conservation.
Marine Geochemistry
Since 1980 a considerable amount of scientific research dealing with geochemical processes in marine sediments has been carried out. This textbook summarizes the state of the art in this field of research. The topics comprise the examination of sedimentological and physical properties of the sedimentary solid phase, of pore water and pore water constituents, organic matter as the driving force of most microbiological processes, biotic and abiotic redox reactions, carbonates and stable isotopes as proxies for paleoclimate reconstruction, metal enrichments in ferromanganese nodules and crusts as well as in hot vents and cold seeps on the seafloor. A new chapter describes properties, occurrence and formation of gas hydrates in marine sediments. The textbook ends with a chapter on model conceptions and computer models to quantify processes of early diagenesis.
Carbonate Reservoir Characterization : An Integrated Approach
One principal need in petroleum recovery from carbonate reservoirs is the description of the three-dimensional distribution of petrophysical properties in order to improve performance predictions by means of fluid-flow computer simulations. The book focuses on a rock based approach for the integration of geological, petrophysical, and geostatistical methods to construct a reservoir model suitable to input into flow simulation programs. This second edition includes a new chapter on model construction and new examples of limestone, dolostone, and touching-vug reservoir models as well as improved chapters on basic petrophysical properties, rock-fabric/petrophysical relationships, calibration of wireline logs, and sequence stratigraphy.
