Automated SEM-EDS heavy mineral analysis reveals no provenance shift between glacial loess and interglacial paleosol on the Chinese Loess Plateau
Automated SEM-EDS heavy mineral analysis reveals no provenance shift between glacial loess and interglacial paleosol on the Chinese Loess Plateau
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DOI：
10.1016/j.aeolia.2014.03.005
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发表时间：
2014-06-01
期刊：
影响因子：
3.3
通讯作者：
Peng, Wenbin
中科院分区：
文献类型：
--
作者：
Nie, Junsheng;Peng, Wenbin
黄土高原冰川黄土和间冰期古土壤沉积物源的研究对认识古大气环流模式具有重要意义。然而，关于中国黄土与古土壤沉积物在时空上是否具有相似的物源，一直存在很大争议。本文报道了基于扫描电镜-能谱联用（SEM-EDS）分析（QEMSCAN@）的两组黄土-古土壤对（L1和S1; L4和S4）重矿物组合结果。结果表明，在冰期和间冰期之间，CLP没有明显的物源转移。重矿物组合的比较西部和中部CLP显示没有物源转移的空间，无论是。黄土-古土壤和潜在源区重矿物组合的对比表明，毛乌素沙漠西部、巴丹吉林沙漠、乌兰布和沙漠以及黄河可能是CLP的主要贡献者。相比之下，东北部毛乌素沙漠不太可能是CLP的主要粉尘来源。毫无疑问，CLP的最终起源历史依赖于综合起源研究。然而，由于其快速性和鲁棒性，综合物源分析应包括基于QEMSCAN的重矿物分析。(C)2014爱思唯尔有限公司版权所有。
Understanding provenance of glacial loess and interbedded interglacial paleosol deposits on the Chinese Loess Plateau (CLP) is important to understanding paleo-atmospheric circulation patterns. However, great debate exists about whether Chinese loess and paleosol deposits have similar provenance both spatially and temporally. Here we report heavy mineral assemblage results of two sets of loess-paleosol couplets (L1 and S1; L4 and S4) from western CLP based on scanning electron microscopy with linked energy dispersive spectrometers (SEM-EDS) analysis (QEMSCAN@). The results demonstrate no apparent provenance shift on the CLP between glacial and interglacial periods. Heavy mineral assemblage comparison between the western and the central CLP reveals no provenance shift spatially, either. Finally, a comparison of heavy mineral assemblage between loess-paleosol and potential source regions reveals that the western Mu Us desert, the Badain Jaran desert, the Ulan Buh desert as well as the Yellow river are likely key dust contributors for the CLP. In contrast, the northeastern Mu Us desert are less likely key dust sources for the CLP. The ultimate provenance history of the CLP relies no doubt on integrated provenance studies. However, due to its rapidity and robustness, integrated provenance analysis should incorporate the QEMSCAN-based heavy mineral analysis. (C) 2014 Elsevier B.V. All rights reserved.