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| GEOCHEMICAL CHARACTERISTICS OF TRACE ELEMENTS IN THE DIORITE WEATHERED CRUST OF ZIGUI AREA |
| ZHANG Yuan-pei1, HUAN Chun-juan1, SUN Wei-guo1, LUO Bi-ji2 |
1. Hubei Institute of Geophysical Exploration Technology, Wuhan 430056, China;
2. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China |
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Abstract Based on studying the distribution of trace elements in the dioritic weathered crust of Zigui area, the authors have divided the trace elements into three types. The first type consists of inactive elements which include Sc, V, Cr, Co, Ni, Cu, Zn, Zr, Hf, Nb and Ta, U, Th, Mo, W. During the weathering process, they can be effectively preserved. Due to the influence of redox condition variation, U, Cr and Cu sometimes show local enrichment, without obvious regularity. The second type is composed of active elements such as Ca, Rb, Cs, Sr, Ba, Pb, Ga, Gd, and Tl, which are gradually leached from profiles along with the weathering. The third type is represented by REE, which are leached from the upper section downward, and enrichment is observed in the mid-lower section, with the leaching degree of HREE higher than that of LREE. Eu gradually changes from positive anomalies in parent rocks into negative anomalies on the surface due to the weathering leaching of plagioclase in parent rocks under the oxidation environment. Under the surface oxidation condition, Ce easily produces tetravalence oxides (cerianite) and shows obvious surface enrichment, and the variation of the redox conditions leads to the undulate variation of Ce.
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Received: 16 August 2011
Published: 10 October 2012
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