湘西北地区民乐式锰矿成矿地质特征及矿床成因  

The mineralization geological characteristics and genesis of Minle type manganese deposits in northwestern of Hunan Province

作　　者：匡文龙[1] 李雪宇 杨绍祥[2] 

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]湖南省地质矿产勘查开发局405队,湖南吉首416007

出　　处：《地质科学》2014年第1期305-323,共19页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(编号:41240019);国家高等学校特色专业建设点项目(编号:TS11027);湖南省国土资源厅项目"湘西北铅锌富集机理研究"(编号:B41101)资助

摘　　要：在野外考察和室内综合研究基础上,从地层岩性、岩相古地理、地质构造等成矿地质条件的分析入手,结合稳定同位素测试数据分析,以古丈锰矿田中的野竹锰矿为例,对湘西北民乐式锰矿床的成矿地质特征及成矿机制进行了探讨,认为区内成矿物质(锰)是多来源的,但主要来源于海底火山活动。在成矿作用过程中,堆集在火山喷口附近的沉积物被烘热的海水淋滤改造,从中析出锰质;由热海水体所挟带,随海流迁移,成矿物质在裂陷槽中沉积下来富集形成锰矿床。民乐式锰矿床属离火山喷发中心较远的海底火山喷发一沉积锰矿床。Based on the detail field investigation and comprehensive studying, demonstrated by example as Yezhu manganese deposit in Guzhang ore field, combined with the test data of stable isotope, Started with the analysis to mineralization geological conditions such as formation lithology, lithofacies-paleogeographical, geological construct. The author studied on the metallogenic geological characteristics and the genesis of Minle type manganese deposits in northwestern Hunan, regarded that metallogenic material were multi-source, mainly derived from the submarine volcano activity. Sediment accumulation in the volcano near the nozzle leached and reformed, precipitated of manganese, then carried by hot seawater, migrated with the current, enriched in the rift trough and formed some manganese deposits during the mineralization. Minle type manganese deposits was one of submarine volcano eruption- sedimentary manganese deposit which far away from the volcano eruption center.

关 键 词：民乐式锰矿 成矿地质特征 矿床成因 湘西北 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]