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High-Resolution Marine Record of Climatic Change in Mid-latitude Chile during the Last 28,000 Years Based on Terrigenous Sediment Parameters

Published online by Cambridge University Press:  20 January 2017

Frank Lamy ,
Dierk Hebbeln  and
Gerold Wefer
Frank Lamy
Affiliation:
Fachbereich Geowissenschaften, Universität Bremen, Postfach 33 04 40, D-28334, Bremen, Germany
Dierk Hebbeln
Affiliation:
Fachbereich Geowissenschaften, Universität Bremen, Postfach 33 04 40, D-28334, Bremen, Germany
Gerold Wefer
Affiliation:
Fachbereich Geowissenschaften, Universität Bremen, Postfach 33 04 40, D-28334, Bremen, Germany
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Abstract

Marine sediment cores from the continental slope off mid-latitude Chile (33°S) were studied with regard to grain-size distributions and clay mineral composition. The data provide a 28,000-yr14C accelerator mass spectrometry-dated record of variations in the terrigenous sediment supply reflecting modifications of weathering conditions and sediment source areas in the continental hinterland. These variations can be interpreted in terms of the paleoclimatic evolution of mid-latitude Chile and are compared to existing terrestrial records. Glacial climates (28,000–18,000 cal yr B.P.) were generally cold–humid with a cold–semiarid interval between 26,000 and 22,000 cal yr B.P. The deglaciation was characterized by a trend toward more arid conditions. During the middle Holocene (8000–4000 cal yr B.P.), comparatively stable climatic conditions prevailed with increased aridity in the Coastal Range. The late Holocene (4000–0 cal yr B.P.) was marked by more variable paleoclimates with generally more humid conditions. Variations of rainfall in mid-latitude Chile are most likely controlled by shifts of the latitudinal position of the Southern Westerlies. Compared to the Holocene, the southern westerly wind belt was located significantly farther north during the last glacial maximum. Less important variations of the latitudinal position of the Southern Westerlies also occurred on shorter time scales.

Type
Original Articles
Information
Quaternary Research , Volume 51 , Issue 1 , January 1999 , pp. 83 - 93
Copyright
University of Washington

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