HOLOCENE CLIMATIC VARIATIONS IN NORTHERN PATAGONIA, ARGENTINA

被引：68

作者：

SCHABITZ, F

机构：

[1] Physische Geographie, Universität Bamberg, D-96045 Bamberg

来源：

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY | 1994年 / 109卷 / 2-4期

关键词：

D O I：

10.1016/0031-0182(94)90180-5

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

Seventeen playa lakes in Patagonia between 39-degrees- and 47-degrees-S were cored with the aim of reconstructing the vegetational, climatic and geomorphological history by means of sedimentological and palynological analysis. The paper discusses the initial results from two salt lakes, Salina Anzoategui (39-degrees-00'23''S, 63-degrees-46'30''W) and Salina Piedra (40-degrees-34'59''S, 62-degrees-40'26''W), lying in closed depressions at the northeastern margin of the arid diagonal of Patagonia. Both the sedimentological and the palynological results of the analyzed sediment cores from these playa lakes suggest prevailing arid climatic conditions with mainly aeolian morphodynamic processes during the mid-Holocene. In late Holocene times the climate changed to more semi-arid conditions, with a higher rainfall frequency and more frequent fluvial input into the lake, possibly reflecting greater influence from the Atlantic high pressure cell leading to more distinct seasonality.

引用

页码：287 / 294

页数：8

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