Geological and Geophysical Investigations of Western Mediterranean Deep Sea Fans PDF Download
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Author: A. F. Limonov
Publisher:
ISBN:
Category : Deep sea ecology
Languages : en
Pages : 180
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Author: A. F. Limonov
Publisher:
ISBN:
Category : Deep sea ecology
Languages : en
Pages : 180
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Book Description
Author: SEPM (Society for Sedimentary Geology)
Publisher: SEPM Soc for Sed Geology
ISBN: 1565761367
Category : Science
Languages : en
Pages : 438
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Accompanying CD-ROM contains digital version of this publication.
Author: Geological Society of London
Publisher: Geological Society of London
ISBN: 9781862392267
Category : Science
Languages : en
Pages : 368
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There has lately been a growth in the number and level of studies of contourite deposits. Most recent studies of contourites have two major lines of interest. One, propelled by the oil industry's continuous move into increasingly deep waters, concerns their economic significance. The other involves the stratigraphic/ palaeoceanographic record of ocean circulation changes imprinted on contourite deposits that can be a key to understanding better the climate-ocean connection. The application of many different theoretical, experimental and empirical resources provided by geophysics, sedimentology, geochemistry, petrology, scale modeling and field geology are used in the 16 papers of this volume, proposing answers to those two main aspects. The papers are subdivided into two major categories (economic interest and stratigraphic/palaeoceanographic significance), with case studies ranging from well-documented drifts to new examples of modern and fossil series, involving a large diversity of geographic and physiographic scenarios worldwide
Author:
Publisher:
ISBN:
Category : Marine biology
Languages : en
Pages : 814
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Author:
Publisher:
ISBN:
Category : Marine biology
Languages : en
Pages : 412
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Book Description
Author: Joel S. Watkins
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 512
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Book Description
Author: N. H. Kenyon
Publisher:
ISBN:
Category : Acoustic imaging
Languages : en
Pages : 158
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The areas visited during the 10th Training-through-Research Programme were the Portuguese Margin, the Gulf of Cadiz, the Lucky Strike area of the Mid-Atlantic Ridge, the Rockall Trough, the Southern Faeroe margin, and the Varring Plateau (Norwegian margin). The investigations were aimed atstudying such geological processes as neotectonics, fluid migration and escape, sediment processes in canyons and sediment reworking and benthic biology in areas swept by deep-sea bottom currents as well as hydrothermal manifestations on mid-ocean ridges. A seismic and sidescan survey of the Marques de Pombal structure (Portuguese margin) allowed a better understanding of a fault system known here from previous studies such as the ARRIFAN0 and BIGSET projects. The fault pattern has been mapped and acoustic images have helped to evaluate the status of their activity. The Marques de Pombal structure showed little evidence of recent activity and is being covered by sediments. Shallow slides found in the vicinity of the structure may, however, indicate some occasional activity disturbing the overlying sedimentary cover. The Pereira de Sousa fault was found to be much more active. Six new mud volcanoes were discovered and studied in the Gulf of Cadiz. Most of them were proved to be recently active. The mud volcanism of the Gulf of Cadiz can be considered as two characteristic regions with different mud breccia lithological composition. Several types of lava sulphite ores sampled during the Azores campaign of Leg 2 allowed a better understanding of volcanic evolution and associated processes of this area. A short 3.5 kHz survey across the Porcupine Seabight mouth, combined with existing swath bathymetry data and a few cores from the area, confirmed the findings of the TTR-7 cruise that the Gollum channel system is currently inactive. The study of a canyon on the northeastern Rockall Trough margin showed that the system is inactive at the present time and the last pulse of active downslope sediment transport took place in immediate pre-Holocene time. Debris flows were found mostly on the flanks of the canyon while the axial zone showed numerous signs of erosion. Sand was not particularly common in the studied area. It is suggested that significant amounts of sand are trapped in the canyon head, possibly due to slumps blocking the narrower waist area. Abundant traces of seabed erosion found immediately beyond the canyon mouth indicate that this area is a bypass zone and sand deposition may occur further into the canyon mouth indicate that this area is a bypass zone and sand deposition may occur further into the basin plain. An extensive collection of TV-guided grab samples and seafloor video records, obtained from sites in the Northern Rockall Trough, Wyville-Thomson Ridge and Southern Faeroe Plateau, provided GOOd insight on the distribution of bottom fauna, including deep-water corals, and of coarse glaciagenie debris. New data on a BSR distribution pattern were obtained on the southeastern part of the Verring Plateau and they suggest that the formation of the Storegga Slide was not directly related to the dissolution of gas hydrates. The investigation also provided a new insight into gas hydrate formation and distribution in the area.
Author: Unesco
Publisher:
ISBN:
Category : Lahars
Languages : en
Pages : 200
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Author:
Publisher:
ISBN:
Category : Coasts
Languages : en
Pages : 80
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Book Description
Author: N. H. Kenyon
Publisher:
ISBN:
Category : Marine sediments
Languages : en
Pages : 160
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Book Description
