Origin of illites in the Luochuan loess section |
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| Authors: | Junfeng Ji Jun Chen Huayue Lu |
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| Institution: | (1) Department of Earth Sciences, State Key Laboratory of Mineral Deposit Research, Nanjing University, 210093 Nanjing, China;(2) Xi’an Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences, 710061 Xi’an, China |
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| Abstract: | Morphology and composition of illite from the Luochuan loess section were investigated by TEM. The results show that most
of the illite grains are characterized by rounded shapes and chemical compositions are closely similar to those of anchizonal
illites. The enrichment of illites in paleosol over loess was mainly caused by the weak winter monsoon during the interglacial
periods, and was not related to thein situ pedogenesis. Illite can serve as an indicator for tracing eolian dust from Loess Plateau in pelagic and lacustrine sediments. |
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| Keywords: | loess illite origin |
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