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Detailed Reference Information |
Normark, W.R. and Serra, F. (2001). Vertical tectonics in northern Escanaba Trough as recorded by thick late Quaternary turbidites. Journal of Geophysical Research 106: doi: 10.1029/2001JB000341. issn: 0148-0227. |
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Escanaba Trough, the southernmost segment of the Gorda Ridge, is filled by as much as 500 m of late Quaternary turbidite and hemipelagic sediment. Coring at Deep Sea Drilling Project Site 35 and Ocean Drilling Program (ODP) Sites 1037 and 1038 together with 4.5-kHz deep-tow and 3.5-kHz surface-ship seismic reflection profiles enable a distinct pattern of reflections to be mapped throughout Escanaba Trough in the upper part of this sediment fill. The uppermost 80 m of turbidite sediment, which includes at least 11 turbidity current events, were deposited in 3200 m. The turbidity currents were trapped upon entering Escanaba Trough, resulting in all of the sediment in suspension in the flows being deposited. The thickness of the turbidite layers reflects both the flow thickness and the vertical grain concentration within the flow that deposited the layer. Variations in the turbidite thickness with respect to water depth can be used to estimate the degree of relative vertical movement within the floor of Escanaba Trough. In the area of hydrothermal activity near ODP Site 1038, uplift of as much as 140 m has occurred over the past 8 kyr. ¿ 2001 American Geophysical Union |
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BACKGROUND DATA FILES |
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Abstract![](/images/icons/spacer.gif) |
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Keywords
Marine Geology and Geophysics, Marine sediments—processes and transport, Marine Geology and Geophysics, Midocean ridge processes, Tectonophysics, Plate boundary—general |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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