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(Article of periodic en Anglais - 1984)

Document title

Late-Glacial Holocene climate of the lake district of Chile

Authors(s) and Affiliation(s)

HEUSSER C. J. ;

Abstract

Pollen evidence from a 350-cm section of a fen in a moraine belt at Rucanancu (3933'S, 7218'W) bears on the controversy regarding interpretation of late-glacial and Holocene climate in midlatitude Chile. A pollen assemblage containing upper montane podocarp (Podocarpus andinus) in quantities reaching 34 % and dating between 10,440 and 10,000 yr B.P. implies a cold climate with summer temperatures possibly 5-8 C lower than today's. Holocene warming began afterward, later than the glacier and beetle records indicate, and continued until at least 8350 yr B.P., as suggested by the sequence of assemblages dominated by Myrtaceae, by Aextoxicon punctatum, and by Gramineae. A subsequent assemblage of Nothofagus obliqua type implies an increase of moisture until 6960 yr B.P., following which N. dombeyi type, under a cool and humid Neoglacial climate, became dominant.

Source

Article of periodic

published at : Quaternary research New York

Editor :

Millesime : 1984, vol. 22, no1 [pp. 77-90]

Bibliographic references : 35 réf.

Language

Anglais

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