摘要
垭都—蟒洞铅锌成矿带是川滇黔矿集区内重要铅锌成矿带,近年来随着猪拱塘超大型铅锌矿床的发现,逐渐成为地质界研究的热点之一。本文在综合分析前期累积各类地质矿产勘查资料的基础上,结合最新找矿勘查和研究成果,通过对比区内铅锌矿体的产出特征及其就位空间,总结其铅锌成矿规律和找矿标志,为区内铅锌地质勘探深入提供实际依据。结果表明,区内铅锌矿体产于二叠系峨眉山玄武岩组之下的碳酸盐岩地层中,铅锌矿床(点)沿垭都—蟒洞主干断裂带成群成带分布,多数铅锌矿(化)体与主控断裂平面距离小于1 km,主干断裂(垭都—蟒洞断层F1)和前峰"冲-褶"体系及次级断裂带为铅锌富集成矿有利地段,其中"褶皱+轴向断层"构造体系、"主干断裂+同向次级断裂"体系、"层间断裂、破碎带、溶洞"等控制了铅锌矿体的产出。此外,区内铅锌矿体主要产于主断裂破碎带内及其下盘,受硅钙界面控制明显,主要赋存于靠碳酸盐岩一侧,而与地层层位无关,仅部分为层间断裂控矿,其中,"高碳泥质挤压蚀变带"和"铁锰碳酸盐化"是区内铅锌矿体主要的近—中近矿围岩蚀变。该区已知矿床的深部一定构造岩性组合空间内找矿潜力较大,如垭都、筲箕湾和亮岩等铅锌矿深部,以及F1南段半边街一带等。
The Yadu-Mangdong Pb-Zn metallogenic belt is an important part in the Sichuan-Yunnan-Guizhou metallogenic province. In recent years, with the discovery of the Super-large scale Zhugongtang Pb-Zn deposit, it has been become one of the geological and geochemical research focuses. In the paper, based on the comprehensive analysis of previously accumulated data of geological exploration, and the combination of latest geological prospecting and research results in the area, we have carried out a comparative study on the occurrence characteristics and hosting positions of Pb-Zn orebodies, and have summarized the ore-forming regularity and prospecting criteria of Pb-Zn orebodies in order to provide practical evidences for further prospecting Pb-Zn resources in the belt. The researches show that the Pb-Zn orebodies in the Yadu-Mangdong belt are hosted in the carbonate stratum under the Permian Emeishan basalt Formation. The different sized Pb-Zn deposits are mainly distributed in groups and belts along the Yadu-Mangdong fault zone. The straight distances between orebodies and the major fault(Yadu-Mangdong fault F1) are normally less than 1 km. The major fault(F1), ‘thrust fault-fold’ system, and secondary faults are favorable spaces for the Pb-Zn enrichment and mineralization. Especially, the occurrences of Pb-Zn orebodies are controlled by the ‘fold + axial faulting’ structural system, ‘major fault + homodromous secondary faults’ system, and ‘interlaminar fractures, fracture zones, and Karst caves’, etc. Furthermore, the Pb-Zn orebodies in the belt are hosted mainly in the major fracture zone and its footwall rocks(mostly in carbonates), which were obviously controlled by the interface of Si-Ca, with a small number of Pb-Zn orebodies hosted in the interlaminar fractures. In particular, The dominant alterations are the ‘high carbonaceous-argillaceous squeezing alteration’ and ‘ferromanganese carbonation’ for wallrocks close to Pb-Zn orebodies in the belt. It is suggested that there is a good potential for prospecting Pb-Zn resources in the depths of known Pb-Zn deposits, including the Yadu, Shaojiwan, Liangyan deposits, and the Banbianjie area in the southern part of F1 in the Yadu-Mangdong metallogenic belt.
作者
蔡国盛
衮民汕
杜蔺
曾道国
叶霖
CAI Guo-sheng;GUN Ming-shan;DU Lin;ZENG Dao-suo;YE Lin(Institute of geology and mineral resources exploration,Non-Ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang 550005,China;State key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)
出处
《矿物学报》
CAS
CSCD
北大核心
2020年第4期376-384,共9页
Acta Mineralogica Sinica
基金
国家自然科学基金项目(编号:U1812402)
贵州省科学技术基金重点项目(编号:黔科合基础[2017]1421)。
关键词
垭都-蟒洞断裂带
主断层
黔西北铅锌成矿特征
硅-钙界面
控矿因素
找矿标志
The Yadu-Mangdong fault zone
major fault
metallogenic characteristics of Pb-Zn deposits in the northwestern Guizhou
the Si-Ca interface
ore-controlling factors
indicator for prospecting mineral resources
