重庆高燕锰矿床含锰碳酸盐岩化学成分标型特征  

Typomorphic characteristics of chemical composition of Mn-bearing carbonate rocks from Gaoyan manganese deposit,Chongqing,China

作　　者：陈佳[1] 董树义[1] 张自贤 朱明忠 程文斌[1] 曾敏 陈荣彬 CHEN Jia;DONG Shuyi;ZHANG Zixian;ZHU Mingzhong;CHENG Wenbin;ZENG Min;CHEN Rongbin(College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;The 205 Geological Team of Chongqing Bureau of Geology and Mineral Resources Exploration, Chongqing 404100, China;Chongqing Geological and Mineral Exploration and Development Group Co., Ltd., Chongqing 401121, China;School of Earth Sciences, Yunnan University, Kunming 650500, China;Kunming Survey, Design and Research Institute Co., Ltd., China Nonferrous Metals Industry, Kunming 650051, China)

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]重庆地质矿产勘查开发局205地质队,重庆404100 [3]重庆市地质矿产勘查开发集团有限公司,重庆401121 [4]云南大学地球科学学院,昆明650500 [5]中国有色金属工业昆明勘察设计研究院有限公司,昆明650051

出　　处：《成都理工大学学报（自然科学版）》2022年第2期239-248,共10页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：重庆市国土资源与房屋管理局项目(SHG012)。

摘　　要：研究重庆市城口县高燕锰矿床含锰碳酸盐岩化学成分标型的特点,探讨化学成分标型与锰矿床成因的关联性。通过对高燕锰矿床开展野外调查,对含锰岩系进行岩石学与矿物学分析以及元素地球化学分析,结果表明锰矿床含锰碳酸盐岩中Mn/Fe值为14.51~58.22,其中围岩普遍低于矿层内部,Ca/Mg值集中在0.95~1.31,Fe^(2+)含量与(Ca^(2+)+Mg^(2+))的含量呈正相关;痕量元素中Ba、Sr、Ni、Zn、V含量较高,含锰岩系中顶板与底板岩石Sr/Ba值高于矿层内部,U/Th平均值大于1.25,Ni/Co平均值大于7,V/(V+Ni)值较小(0.27~0.56)。锰元素的富集大致经历了两个阶段,富集过程受陆源物质影响较小,成矿环境为高盐度半深海相;Fe^(2+)与Mn^(2+)的含量呈负相关,U/Th与Ni/Co的值与锰的含量也呈负相关,即Fe^(2+)含量或相关矿物含量、U/Th与Ni/Co值对高燕锰矿床含锰碳酸盐岩中锰的富集程度具有标型意义。Based on the field investigation,combined with the analysis of petrology,mineralogy and element geochemistry of the manganese-bearing rock series,the characteristics of the geochemical classification type of the manganese-bearing carbonate rocks in the Gaoyan manganese deposit in Chengkou County,Chongqing are studied and the correlation between the typomorphic chemical composition and the genesis of the manganese deposit is discussed.The results show that the value of Mn/Fe in manganese bearing carbonate rocks is 14.51~58.22,the values of Ca/Mg are concentrated in 0.95~1.31,the content of Fe^(2+)is positively correlated with the content of(Ca^(2+)+Mg^(2+))and the contents of Ba,Sr,Ni,Zn and V are relatively high.Sr/Ba value of roof and floor rocks in manganese-bearing rock series is higher than that of the inner layers.The average value of U/Th is greater than 1.25,the value of V/(V+Ni)is relatively low(0.27~0.56)and the average value of Ni/Co is greater than 7.It reveals that the enrichment of manganese goes through two stages,which is less affected by terrigenous materials,and the ore-forming environment is high salinity semi-deep marine facies.Since the contents of Fe^(2+)and Mn^(2+)are negatively correlated,and the values of U/Th and Ni/Co are also negatively correlated with the contents of manganese,the contents of Fe^(2+)or related minerals,U/Th and Ni/Co are of typomorphic significance to the enrichment degree of manganese in the manganese-bearing carbonate rock of Gaoyan manganese deposit.

关 键 词：高燕锰矿 碳酸盐岩 标型特征 

分 类 号：P618.32[天文地球—矿床学]