Spectroscopy and Spectral Analysis, Volume. 32, Issue 10, 2765(2012)
Mineralogy and Genesis of Mixed-Layer Clay Minerals in the Jiujiang Net-Like Red Soil
Mineralogy and genesis were investigated using X-ray diffraction (XRD), Fourier infrared absorption spectroscopy (FTIR) and high resolution transmission electron microscopy (HRTEM) to understand the mineralogy and its genesis significance of mixed-layer clay minerals in Jiujiang red soil section. XRD and FTIR results show that the net-like red soil sediments are composed of illite, kaolinite, minor smectite and mixed-layer illite-smectite and minor mixed-layer kaolinite-smectite. HRTEM observation indicates that some smectite layers have transformed into kaolinite layers in net-like red soil. Mixed-layer illite-smectite is a transition phase of illite transforming into smectite, and mixed-layer kaolinite-smectite is a transitional product relative to kaolinite and smectite. The occurrence of two mixed-layer clay species suggests that the weathering sequence of clay minerals in net-like red soil traversed from illite to mixed-layer illite-smectite to smectite to mixed-layer kaolinite-smectite to kaolinite, which indicates that net-like red soil formed under a warm and humid climate with strengthening of weathering.
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YIN Ke, HONG Han-lie, LI Rong-biao, HAN Wen, WU Yu, GAO Wen-peng, JIA Jin-sheng. Mineralogy and Genesis of Mixed-Layer Clay Minerals in the Jiujiang Net-Like Red Soil[J]. Spectroscopy and Spectral Analysis, 2012, 32(10): 2765
Received: Apr. 9, 2012
Accepted: --
Published Online: Nov. 22, 2012
The Author Email: Ke YIN (yinke1984@qq.com)