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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The signature of river- and wind-borne materials exported from Patagonia to the southern latitudes: a view from REEs and implications for paleoclimatic interpretations
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The signature of river- and wind-borne materials exported from Patagonia to the southern latitudes: a view from REEs and implications for paleoclimatic interpretations

机译：从巴塔哥尼亚出口到南纬的河运和风载材料的签名：稀土元素的观点及其对古气候解释的启示

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摘要

Riverine and wind-borne materials transferred from Patagonia to the SW Atlantic exhibit a homogeneous rare earth element (REE) signature. They match well with the REE composition of Recent tephra from the Hudson volcano, and hence this implies a dominance of material supplied by this source and other similar Andean volcanoes. Due to the trapping effect of proglacial and reservoir lakes, the larger Patagonian rivers deliver to the ocean a suspended load with a slightly modified Andean signature, that shows a REE composition depleted in heavy REEs. In this paper we redefine Patagonia as a source of sediments, which is in contrast with other sources located in southern South America. Quaternary sediments deposited in the northern and, to a lesser extent, in the southern Scotia Sea, and most of the dust in ice cores of east Antarctica have REE compositions very similar to the loess from Buenos Aires Province and to Patagonian eolian dust. However, we rule out Buenos Aires province as a Holocene major source of sediments. Similarly to Buenos Aires loess (a proximal facies), it is likely that the REE compositions of most sediment cores of the Scotia Sea and Antarctica reflect a distal transport of dust with an admixed composition from two main sources: a major contribution from Patagonia, and a minor proportion from source areas containing sediments with a clear upper crustal signature (e.g., western Argentina) or from Bolivia's Altiplano. Evidence indicates that only during the Last Glacial Maximum, Patagonian materials were the predominant sediment source to the southern latitudes.
机译：从巴塔哥尼亚转移到西南大西洋的河流和风载物质显示出均质的稀土元素（REE）特征。它们与哈德森火山的最近特非拉的稀土元素组成非常吻合，因此这暗示着该来源和其他类似安第斯火山提供的材料占主导地位。由于冰川湖和水库湖泊的诱集作用，较大的巴塔哥尼亚河流向海洋输送了具有轻微修改的安第斯特征的悬浮物，表明重稀土元素中的稀土元素已经耗尽。在本文中，我们将巴塔哥尼亚重新定义为沉积物来源，这与南美洲南部的其他来源形成鲜明对比。沉积在北部和较小程度的斯科舍海南部的第四纪沉积物，以及南极东部冰芯中的大部分尘埃具有与布宜诺斯艾利斯省的黄土和巴塔哥尼亚风积尘埃非常相似的稀土元素。但是，我们排除了布宜诺斯艾利斯省为全新世的主要沉积物来源。与布宜诺斯艾利斯黄土（近海相）类似，斯科舍海和南极洲大多数沉积岩芯的稀土元素组成也可能反映了粉尘向远处的迁移，其主要成分来自两个主要来源：巴塔哥尼亚的主要贡献，以及少量来自含有沉积物且上部地壳特征清晰的源区（例如，阿根廷西部）或玻利维亚的高原。有证据表明，只有在最后一次冰川最大时期，巴塔哥尼亚的物质才是南部纬度的主要沉积物来源。

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