By Dorrik A. V. Stow
Contourites are a frequent yet poorly recognized workforce of sediments associated with the motion of strong backside currents in deep water. even though we all know they're particularly universal alongside continental margins and during oceanic gateways, they've been surrounded by way of the debate considering that they have been first famous within the early Nineteen Sixties. the place thoroughly well-known and decoded they could supply one of many keys to our greater realizing of backside water movement and of the ocean-climate hyperlink. they're a part of the spectrum of deposits that confronts the oil as exploration strikes into gradually higher water depths. This memoir is a vital end result of the overseas Geological Correlation undertaking 432 on backside Currents, Contourites and Paleocirculation. It contains 30 papers concerning over seventy five key scientists from all over the world. Following an introductory state of the art paper by way of the editors, there are 25 separate case reviews on smooth drifts and 4 on historical contourite sequence. This quantity is devoted to the reminiscence of Charlie Hollister (1936-1999), one of many founding fathers and pioneers of contourite learn. additionally to be had: monetary and Palaeoceanographic value of Contourite Deposits - distinct ebook No 276 - ISBN 9781862392267 3D Seismic know-how - Geological Society Memoirs M0029 - ISBN 9781862391512 The Geological Society of LondonFounded in 1807, the Geological Society of London is the oldest geological society on the earth, and one of many greatest publishers within the Earth sciences.The Society publishes a variety of top of the range peer-reviewed titles for teachers and execs operating within the geosciences, and enjoys an enviable overseas recognition for the standard of its work.The many components within which we submit in include:-Petroleum geology-Tectonics, structural geology and geodynamics-Stratigraphy, sedimentology and paleontology-Volcanology, magmatic stories and geochemistry-Remote sensing-History of geology-Regional geology courses
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Extra info for Deep-water contourite systems: modern drifts and ancient series, seismic and sedimentary characteristics
1971. Bottom currents on the New England continental rise. Journal of Geophysical Research, 76, 5865-5876. The Greater Antilles Oute r Ridge: development o f a distal sedimentary drif t by deposition o f fine-grained contourites BRIAN E. edu) Abstract: The Greater Antilles Outer Ridge, located north and northwest of the Puerto Rico Trench, is a deep (>5100 m), distal sediment drift more than 900 km long and up to 1 km thick. It has been isolated from sources of downslope sedimentation throughout its history and is formed of clay- to fine silt-size terrigenous sediments that have been deposited from suspended load carried in the Western Boundary Undercurrent, together with 0-30% pelagic foraminiferal carbonate.
Because of the fine, relatively uniform grain size of the sediments, the outer ridge consists of sediments that are seismically transparent in low-frequency reflection profiles. Sediment tracers (chlorite in sediments and suspended particulate matter, reddish clays in cores) indicate that at least a portion of the ridge sediments has been transported more than 2000 km from the eastern margin of North America north of 40°N. The outer ridge began to develop as early as the beginning of Oligocene time when strong, deep thermohaline circulation developed in the North Atlantic and the trough initiating the present Puerto Rico Trench had cut off downslope sedimentation from the Greater Antilles.
Fig. 14B, BC6, 0-1 mm). This truncated ramp is the fine tail of the sand distribution. 6 um because of an under-counting artifact. The coarse mode size and peak height were found to be well correlated. 93. A powerful physical control is suggested by these relations. These data, as with the pipette data for the whole continental rise given above, show fractionation during deposition of the fines in which deposition under stronger flows yields less clay and increases both the percentage and modal size of the silt.