鄂西长阳胡家湾—樟木岩一带南华纪锰矿成矿规律与找矿潜力  

Metallogenic regularity and prospecting potential of Nanhua Period manganese deposits in Hujiawan-Zhangmuyan area,Changyang,western Hubei

作　　者：曾凯 廖驾 刘海 黄德将 欧权 郭威[1] 周海洋 ZENG Kai;LIAO Jia;LIU Hai;HUANG Dejiang;OU Quan;GUO Wei;ZHOU Haiyang(Changsha General Survey of Natural Resources Centre,China Geological Survey,Changsha 410600,Hunan,China;Hubei Institute of Metallurgical Geology(Central South Institute of Metallurgical Geology),Yichang 443003,Hubei,China)

机构地区：[1]中国地质调查局长沙自然资源综合调查中心,湖南长沙410600 [2]湖北冶金地质研究所(中南冶金地质研究所),湖北宜昌443003

出　　处：《矿产勘查》2025年第1期142-154,共13页Mineral Exploration

基　　金：中国地质调查局地质调查项目(DD20243079);湖北省国土资源科技攻关计划项目(ETZ2014A05);湖北省科技发展专项(42000023205T000000230)联合资助。

摘　　要：鄂西长阳胡家湾—樟木岩一带位于扬子地块东南缘南华裂谷盆地神—长—鹤断陷盆地内,南华纪含锰岩系较发育,锰矿成矿地质条件优越,相继发现了古城锰矿、跑马坪锰矿等大中型锰矿。本文在详细的矿床学、地球化学工作基础上,对区内锰矿成矿规律进行了系统总结,结合前期勘查成果,分析了锰矿找矿潜力,指出了研究区锰矿找矿有利地段。结果表明,锰质表现为多来源,既有陆源来源,也有热水来源,并以后者为主,锰矿应形成于贫氧-还原的环境。锰矿层具三分结构的富集特征,在剖面上形成上、下为贫矿,中间为富矿的“两贫夹一富”的沉积富集特征,平面上,富矿带形成于盆地沉积中心,其四周交替出现中、贫矿带,分带富集,与含锰岩系沉积厚度呈正相关关系。综合研究认为“古城式”锰矿在胡家湾—樟木岩一带以西仍有较大的找矿潜力,对于已知锰矿床深边部及外围实现找矿突破具有一定的指导意义。The Hujiawan-Zhangmuyan area of Changyang,Western Hubei Province,is located in the Shen⁃chang He fault basin of the Nanhua Rift Valley on the southeastern edge of the Yangtze Block.The Nanhua Period manganese rock system is relatively developed,manganese deposits have superior geological conditions for mineral⁃ization,and large and medium-sized manganese deposits such as Gucheng manganese deposit and Paomaping man⁃ganese deposit have been discovered successively.On the basis of detailed mineral deposit and geochemical work,the metallogenic regularity of manganese deposits in this area is systematically summarized.Based on the previous exploration results,analyzed the prospecting potential of manganese ore,identifiedfavorable areas for manganese ore exploration in the research area.The results show that manganese comes from many sources,including terres⁃trial source and hot water source,and the latter is the main source.Manganese ore should be formed in an oxygen deficient reducing environment.The manganese ore bed has the enrichment characteristic of the trisection structure,in the section,the upper and the lower are the lean ore,the middle is the rich ore"Two lean and one rich"sedimen⁃tary enrichment characteristic,in the plane,the rich ore belt forms in the basin sedimentary center,the middle and poor ore belts occur alternately and are enriched by zonation,which has a positive correlation with the sedimentary thickness of the manganese bearing rock series.Comprehensive study shows that"Gucheng Type"manganese ore in Hujiawan-Zhangmuyan area west of the greater prospecting potential,it has certain guiding significance for achiev⁃ing breakthroughs in mineral exploration in the deep and peripheral areas of known manganese deposits.

关 键 词：南华纪锰矿 成矿规律 找矿潜力 胡家湾—樟木岩 鄂西 

分 类 号：P618.43[天文地球—矿床学]