9780444529985

Contourites

by ;
  • ISBN13:

    9780444529985

  • ISBN10:

    0444529985

  • Edition: CD
  • Format: Hardcover
  • Copyright: 2008-12-15
  • Publisher: Elsevier Science
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Summary

Contourites are sediments deposited or substantially reworked by bottom currents. The study of contourites is nowadays crucial for several fields of fundamental and applied research: palaeoclimatology and paleoceanography, since these fairly continuous and relatively high-resolution sediments hold the key for priceless information on the variability in circulation patter, current velocity, oceanographic history and basin interconnectivity; hydrocarbon exploration, since accumulation of source rocks may be favoured by weak bottom currents, whereas "clean" deep-sea sands may be formed by robust flows; slope stability, since low-permeability fine-grained contourites facilitate the formation of overpressurized gliding planes when fresh contourites with a high pore-water content becomes rapidly loaded, or when their rigid biosiliceous microfabric collapses due to diagenetic conditions. Despite its significance, this group of sediments is poorly known by the majority of nonspecialists. Notwithstanding the growing interest and the intensified research in contourites, a textbook that might also serve as a reference book on contourites was missing until now. This book addresses all aspects of the knowledge in the field of contourites and provides an authorative and comprehensive coverage of the subject. It also can serve as a standard reference work for non-specialists, and in particular postgraduate students, university teachers and lecturers, researchers and professionals who are seeking an authoritative source of information about contourites. * reviews both theoretical topics and case histories * provides practical advice on multidisciplinary research techniques * provides also nonspecialist users with an intuitively-accessible, cross-referenced, and comprehensive coverage of the knowledge in the field. * provides a helpful tool for research in the preparation of classroom lectures

Table of Contents

Contourite Research
Introduction
Personal reminiscences on the history of contourites
Methods for contourite research
Bottom currents
Abyssal and contour currents
Deep-water bottom currents and their deposits
Dynamics of the bottom boundary layer
Processes
Sediment entrainment
Size sorting during transport and deposition of fine sediments: sortable silt and flow speed
The nature of contourite deposition
Sediments
Traction structures in contourites
Bioturbation and biogenic sedimentary structures in contourites
Some aspets of diagenesis in contourites
Contourite facies and the facies model
Morphology, geometry and palaeoceanographic reconstructions
Contourite drifts: nature, evolution and controls
Sediment waves and bedforms
Seismic expression of contourite depositional systems
Identification of ancient contourites: problems and paleoceanographic signifance
Domains
Abyssal plain contourites
Continental slope contourites
Shallow water contourites
Mixed turbidite-contourite systems
High latituted contourites
Importance
Economic relevance of contourites
Paleoceanographic significance of contourite drifts
The significance of contourites for submarine slope stability
Table of Contents provided by Publisher. All Rights Reserved.

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