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Late Pleistocene History of the North Pacific: Evidence from a Quantitative Study of Radiolaria in Core V21-173

Published online by Cambridge University Press:  20 January 2017

Harvey Maurice Sachs*
Affiliation:
CLIMAP, Department of Geological Sciences, Brown University, Providence RI 02912 USA

Abstract

Objective quantitative estimates of paleo-oceanographic conditions in the North Pacific can be made by analyses of radiolarian assemblages. With appropriate computation, transfer functions developed in a study of surface sediments can be used to estimate oceanographic conditions in cores containing late Pleistocene radiolarian faunas. Analysis of core V21-173 indicates that conditions as warm as the Holocene were rare during the past 800,000 yr, and that the region experienced marked near-surface temperature drops correlative with Caribbean and continental records for the past 250,000 yr. A major world-wide warm event at about 400,000 yr is also indicated.

Type
Original Articles
Copyright
University of Washington

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