Isotopic constraints on the source of Argentinian loess – with implications for atmospheric circulation and the provenance of Antarctic dust during recent glacial maxima

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• 作者：Smith ; James ; Vance ; Derek ; Kemp ; Rob A. ; Archer ; Corey ; Toms ; Phillip ; King ; Matthew ; Zá ; rate ; Marcelo
• 关键词：Loess ; South America ; ice-core ; Antarctica ; Sr&ndash ; Nd
• 刊名：Earth and Planetary Science Letters
• 出版年：2003
• 出版时间：July 15, 2003
• 年：2003
• 卷：212
• 期：1-2
• 页码：181-196
• 全文大小：410 K

文摘

We present rare-earth element (REE) and Sr–Nd isotopic data for Argentinian loess (28–38°S) with two aims: (1) to examine the source regions of Argentinian loess and the constraints that these put on palaeo-wind directions; (2) to further investigate the source of Antarctic ice-core dust and to test the hypothesis that some of it could be derived from a region to the north of Patagonia – into which the dry, dusty, westerly dominated Patagonian climate expanded during Quaternary glacial maxima. Sr–Nd isotopic data for Argentinian loess from north of 37°S are distinct from Patagonian loess compositions in that they have more radiogenic Sr (⁸⁷Sr/⁸⁶Sr=0.7059–0.7123) and less radiogenic Nd (_Nd