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

作　　者：周维贵[1] 李余生[1] 朱明忠 张自贤 张俊[3] 韩旭渊 黄治清 王学明 

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]重庆市地质矿产勘查开发局205地质队,重庆402160 [3]河海大学文天学院,安徽马鞍山243031

出　　处：《地质与资源》2016年第2期159-163,共5页Geology and Resources

基　　金：中国地质调查局矿产地质调查项目(12120114078801);重庆市国土资源和房屋管理局"重庆市城口高燕锰矿床外围矿体定位预测研究"项目(cqgt-kj-2012009);宿州区域发展协同创新中心开放课题(2014SZXTKF02)

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、Si O2、Ca O、Mg O、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、（Mg O/Al2O3）×10^2、Al/（Al＋Fe＋Mn）和Si O2/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Si O2/Al2O3值则指示其沉积过程中有热水参与,是热水沉积的产物.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, Si O2, Ca O, Mg O, Al2O3 and LOI. The values of Mn/Al,（Mg O/Al2O3）×10^2 and Si O2/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.

关 键 词：菱锰矿 陡山沱组 热水沉积成因 地球化学特征 重庆高燕地区 

分 类 号：P618.32[天文地球—矿床学]