重庆高燕地区菱锰矿热水沉积成因地球化学证据

周维贵; 李余生; 朱明忠; 张自贤; 张俊; 韩旭渊; 黄治清; 王学明

doi:10.13686/j.cnki.dzyzy.2016.02.011

重庆高燕地区菱锰矿热水沉积成因地球化学证据

GEOCHEMICAL EVIDENCE FOR THE HYDROTHERMAL SEDIMENTARY ORIGIN OF RHODOCHROSITE DEPOSIT IN GAOYAN, CHONGQING

摘要

摘要: 重庆高燕锰矿床位于晚震旦世秦巴成锰沉积盆地，主要赋存于陡山沱组顶部，以鲕粒或球粒状产出.为了查明其成因，在收集该区锰矿相关成果的基础上，对ZK129-3^#、ZK115-7^#、ZK127-7^#、ZK133-7^#、ZK115-11^#五个钻孔的陡山沱组鲕状菱锰矿进行系统采样，并测试了包括Mn、Fe、P、SiO₂、CaO、MgO、Al₂O₃和LOI在内的8个地球化学指标，进而运用指相元素地球化学分析了Mn/Al、（MgO/Al₂O₃）×10²、Al/（Al+Fe+Mn）和SiO₂/Al₂O₃比值.结果表明：重庆高燕菱锰矿受陆源物质的影响很小，与海洋沉积有关，主要是海洋自生产物；Al/（Al+Fe+Mn）和SiO₂/Al₂O₃值则指示其沉积过程中有热水参与，是热水沉积的产物.

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.

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