Call number:
AWI G4-92-0478
Description / Table of Contents:
Contents: Chapter 1 Seabed pockmarks and seepages: an introduction. - Chapter 2 Focus on North Sea pockmarks. - Chapter 3 Detailed surveys of North Sea pockmarks and seepages. - Chapter 4 Pockmarks around the world. - Chapter 5 A theory of pockmark formation. - Chapter 6 Submarine seepages. - Chapter 7 Features associated with seepage. - Chapter 8 Seepages and mineral precipitation. - Chapter 9 The ecology of pockmarks and seepages. - Chapter 10 Some implications and consequences of widespread seabed seepages. - Epilogue. - Appendix I Methane in seabed sediments. - Appendix II Survey techniques. - Appendix III Seabed relief maps and locations. - Glossary. - Index
Description / Table of Contents:
This original new work represents a major breakthrough in marine geology and ecology. The book examines the fact that gases are generated in, and fluids circulate through seabed sediments. The recognition of such a dynamic seabed environment has far-reaching implications for the understanding of sediment dynamics, marine biological productivity, mineral cycles, the CO2 budget, ferro-manganese nodule formation and carbonate formation. Seabed pockmarks are described, firstly from detailed studies conducted in the North Sea, and then with reference to pockmarks from many different parts of the world. The evidence presented is then used to explain their mode of formation. The discovery in pockmarks of a dense and varied fauna, and of methane-generated carbonate cements has led the authors to a comparison with seabed seepages in other marine geological contexts, including the hydrothermal seepages of ocean spreading centres, subduction zones, etc, where assemblages of seepage-dependent organisms have been found. The authors discuss their concept of a dynamic fluid circulation system in soft sediments, oceanic crust and sedimentary basins which result in the precipitation of minerals and the provision of nutrients to marine biological communities. Their findings may form the basis of a new understanding of ocean energy and nutrient budgets and the immense productivity of the world's seas and oceans. The book will be especially valuable to those interested in: sedimentology and marine geology, marine biology and ecology, marine and atmospheric pollution, offshore hydrocarbon exploration and exploitation, the floors of the world's seas and oceans in general.
Type of Medium:
Monograph available for loan
Pages:
xii, 293 S. : graph. Darst.
Edition:
1. publ.
ISBN:
0860109488
Branch Library:
AWI Library
Permalink
