摘要
为揭示湘西泸溪县兴隆场地区锰矿的成矿规律及找矿潜力,通过野外地质调查、岩矿鉴定及构造-岩相分析,系统研究了该区锰矿的地质特征与控矿因素。结果表明,锰矿赋存于南华系大塘坡组下段(N_(2)d^(1))黑色炭质页岩中,呈似层状或透镜状分布,矿石类型以中磷高铁酸性氧化锰为主。成矿作用受多期构造-沉积演化控制:雪峰运动及NE向断裂(如大水坪正断层)为锰质运移提供通道;局限-半局限浅海陆棚环境促使锰质经化学沉积与藻类生物絮凝作用富集。矿体空间分布具明显分带性,西部庙背村-小竹山一带含锰岩系厚度大(0.85~8.91 m),断裂倾角较大(75°~80°)地段矿化体厚度显著增加,而东部塘家寨地区因岩系变薄矿化减弱。该区锰矿成矿物质具陆源风化、海底热液及生物协同的多源性,断裂构造与岩相组合是控矿主因,后续勘查应聚焦NE向断裂与背斜核部结合部位。
To uncover the mineralization patterns and explore the prospecting potential of manganese deposits in the Xinglongchang area,Luxi County,western Hunan,we conducted field geological surveys,petrographic identification,and structural-facies analysis.Results show that the manganese deposits are hosted in the lower Datangpo Formation(Nh_(2)d^(1))of the Nanhua System’s black carbonaceous shale,occurring as sublayered or lenticular bodies,with the ore type dominated by medium-phosphorus high-iron acidic manganese oxides.The mineralization was controlled by multi-phase tectono-sedimentary evolution.The Xuefeng Movement and NE-trending faults(the Dashuiping normal fault)provided migration pathways for manganese,while a restricted-semi-restricted shallow marine shelf environment enabled its enrichment via chemical sedimentation and algal bioflocculation.The ore bodies show distinct spatial zonation.In the western Miaobeicun-Xiaozhushan area,the manganese-bearing strata are thick(0.85-8.91 m),and the ore bodies are significantly thicker in zones with a high fault dip angle(75°-80°).In the eastern Tangjiazhai area,the ore bodies weaken due to thinner strata.The manganese source is multisourced,involving continental weathering,hydrothermal,and biological processes.Fault structures and facies combinations are the main ore-controlling factors.Future exploration should focus on the intersections of NE-trending faults and anticlinal cores.
作者
王哲
舒敏
王鹏飞
许鑫
刘林飞
高宝龙
WANG Zhe;SHU Min;WANG Pengfei;XU Xin;LIU Linfei;GAO Baolong(Central South Bureau,China Metallurgical Geology Administration,Wuhan,Hubei 430081,China;Central South Geological Survey Institute,China Metallurgical Geology Administration,Wuhan,Hubei 430080,China)
出处
《中国锰业》
2025年第1期6-10,共5页
China Manganese Industry
基金
中国地质调查局基金项目(编号:DD20190814)。
关键词
兴隆场
锰矿
大塘坡组
成矿规律
构造控矿
岩相控矿
Xinglongchang
manganese deposits
Datangpo formation
mineralization patterns
structural control
facies control
