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Persistent Late Pleistocene-Holocene Seasonal Upwelling and Varves Off the Coast of California

Published online by Cambridge University Press:  20 January 2017

Roger Y. Anderson ,
Eileen Hemphill-Haley  and
James V. Gardner
Roger Y. Anderson
Affiliation:
Department of Geology, University of New Mexico, Albuquerque, New Mexico 87131 USA
Eileen Hemphill-Haley
Affiliation:
U.S. Geological Survey, MS-999, Menlo Park, California 94025 USA
James V. Gardner
Affiliation:
U.S. Geological Survey, MS-999, Menlo Park, California 94025 USA
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Abstract

Seasonal production of siliceous phytoplankton and a seasonal flux of terrigenous clastic material produced varved sediments along the continental slope off California during the late Pleistocene to mid-Holocene. Light-colored sediment within laminations and in sediment-trap samples was deposited during summer upwelling and contains an abundance of the diatoms Skeletonema costatum and Chaetoceros spp. resting spores. Dark-colored sediment deposited in the fall and winter contains abundant Thalassiosira pacifica, and has more terrigenous material. Distribution of diatoms in varves shows that seasonal upwelling has persisted along the California coast and has remained strongly seasonal since the late Pleistocene.

Type
Articles
Information
Quaternary Research , Volume 28 , Issue 2 , September 1987 , pp. 307 - 313
Copyright
University of Washington

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