GEOCHEMICAL EVIDENCE FOR THE HYDROTHERMAL SEDIMENTARY ORIGIN OF RHODOCHROSITE DEPOSIT IN GAOYAN, CHONGQING
ZHOU Wei-gui1, LI Yu-sheng1, ZHU Ming-zhong2, ZHANG Zi-xian2, ZHANG Jun3, HAN Xu-yuan1, HUANG Zhi-qing2, WANG Xue-ming2
1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China; 2. No. 205 Geological Team, Chongqing Bureau of Geology and Minerals Exploration, Chongqing 402160, China; 3. Wentian College, Hohai University, Ma'anshan 243031, Anhui Province, China
Abstract：The Gaoyan manganese deposit in Chongqing is located in the Late Sinian Qinba Mn sedimentary basin. The rhodochrosite ores occur in the top of Doushantuo Formation in the form of ooid or pellet. Based on previous researches, samples of the ooid rhodochrosite are systematically taken from 5 boreholes in the Doushantuo Formation to test the geochemical items of Mn, Fe, P, SiO2, CaO, MgO, Al2O3 and LOI. The values of Mn/Al, (MgO/Al2O3)×102 and SiO2/Al2O3 are analyzed with indicating element geochemistry. The results show that the rhodochrosite is mainly marine authigenic product related to marine sedimentation, with little affection of terrigenous material. The deposition process of rhodochrosite is involved with hot water. The rhodochrosite is the result of hydrothermal sediment.
2016, Vol. 25 
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