| 光谱学与光谱分析 |
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| Mineralogy and Genesis of Mixed-Layer Clay Minerals in the Jiujiang Net-Like Red Soil |
| YIN Ke1, HONG Han-lie1*, LI Rong-biao1, 2, HAN Wen1, WU Yu3, GAO Wen-peng1，JIA Jin-sheng1, 4 |
1. Faculty of Earth Sciences，China University of Geosciences，Wuhan 430074，China
2. Institute of Tourism, Kaili University，Kaili 556000，China
3. Institute of Jewellery，China University of Geosciences，Wuhan 430074，China
4. Zhejiang No. 3 Geological Party，Jinhua 321001，China |
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Abstract 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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Received: 2012-04-09
Accepted: 2012-07-15
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Corresponding Authors:
HONG Han-lie
E-mail: honghl8311@yahoo.com.cn
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