The Laurentian Fan: Sohm Abyssal Plain |
| |
| Authors: | David J W Piper Dorrik A V Stow and William R Normark |
| |
| Institution: | (1) Atlantic Geoscience Centre, Geological Survey of Canada, Bedford Institute of Geology, P. O. Box 1006, B2Y 4A2 Dartmouth, N. S., Canada;(2) Grant Institute of Geology, University of Edinburgh, West Mains Road, EH9 3JW Edinburgh, Scotland;(3) U.S. Geological Survey, 345 Middlefeld Road, 94025 Menlo Park, CA, USA |
| |
| Abstract: | The 0.5- to 2-km thick Quaternary Laurentian Fan is built over Tertiary and Mesozoic sediments that rest on oceanic crust.
Two 400-km long fan valleys, with asymmetric levees up to 700-m high, lead to an equally long, sandy, lobate basin plain (northern
Sohm Abyssal Plain). The muddy distal Sohm Abyssal Plain is a further 400-km long. The sediment supplied to the fan is glacial
in origin, and in part results from seismically triggered slumping on the upper continental slope. Sandy turbidity currents,
such as the 1929 Grand Banks earthquake event, probably erode the fan-valley floors; but thick muddy turbidity currents build
up the high levees.
Margin setting represents fan and/or source area |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
