Dust provenance in Antarctic ice during glacial periods: From where in southern South America?

被引：106

作者：

Gaiero, Diego M. ^{[1
]}

机构：

[1] Univ Nacl Cordoba, CONICET, CICTERRA, CIGeS, Cordoba, Argentina

来源：

GEOPHYSICAL RESEARCH LETTERS | 2007年 / 34卷 / 17期

关键词：

D O I：

10.1029/2007GL030520

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The origin of dust deposited in East Antarctica is not fully understood yet. This study demonstrates that, contrary to Nd, Sr isotopes are strongly fractionated in the finest-sized material representing potential dust sources in South America. Analysis of Nd isotopes suggests that Argentine loess, Southern Ocean sediments and Antarctic dust, may all have a related origin or can represent comparable mechanisms of eolian sediment transport and deposition. This analysis also concludes that the Patagonian signature can explain a high proportion of the isotopic composition of dust trapped in Antarctic ice during glacial periods. The Puna-Altiplano plateau emerges as the second possible important sediment contributor explaining the crustal-like signature found in East Antarctic dust and should be considered as a potential source area when Quaternary paleoclimate is reconstructed from Argentine loess, Antarctic dust and South Atlantic sediment records.

引用

页数：6

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