云南兰坪盆地河西锶矿床成因及找矿标志  

Genesis and Prospecting Criteria of Hexi Strontium Deposit in Lanping Basin,Yunnan Province

作　　者：郑义舟 何沁璇 ZHENG Yizhou;HE Qinxuan(Geological,Geophysical&Geochemical Exploration Institute of Yunnan Nonferrous Geology Bureau)

机构地区：[1]云南省有色地质局地质地球物理化学勘查院,云南省昆明市650216

出　　处：《现代矿业》2025年第2期178-182,共5页Modern Mining

摘　　要：滇西兰坪盆地位于青藏高原东南缘、三江成矿带的中南部,已探明天青石资源量超过500万t,发育多个大型锶矿床。为研究河西锶矿床成因机制,开展了详实的地质调查及矿床地质特征研究,结果表明:矿区构造继承区域构造格局,为总体倾向南西的倒转单斜构造,下含矿层赋存于达乌山向形背斜两翼,上含矿层为区内次要含矿层;矿区地层由沉积原地和外来系统组成,主要出露下第三系云龙组及上三叠统石钟山组,其中石钟山组二段上岩性段灰岩是主要的含矿岩性;矿(化)体主要呈似层状、透镜状产出,矿区广泛发育两期天青石化,矿石中的交代残余结构反映出典型的后期热液成因;矿床属沉积—热液改造型矿床,后续找矿应聚焦石钟山组二段(T3s2)纹层状灰岩+褶皱+走滑控矿断层的控矿组合地段。Lanping Basin in western Yunnan Province is located in the southeastern margin of Qing-hai—Xizang Plateau and the central and southern part of the Sanjiang Metallogenic Belt,with more than 5 million tons Celestites of proven resources and several large Strontium deposits.In order to study the genetic mechanism of the Hexi Strontium Deposit,detailed geological investigation and geological characteristics of the deposit have been carried out,and the results show that the structure of the mining area is inherited from the regional tectonic pattern and is an inverted monoclinal structure with general inclination to the south-west.The lower ore-bearing layer exists on the two wings of Dawushan synclinal anticline,and the upper ore-bearing layer is the secondary ore-bearing layer in the area.The strata in the mining area are composed of sedimentary autochthonous and alien systems,mainly emerging from Yunlong Formation of Lower Tertia-ry and Shizongshan Formation of Upper Triassic,in which limestone of upper second member of Shizong-shan Formation is the main ore-bearing lithology.The ore body is mainly stratified and lens-like,and two stages of azurization are widely developed in the mine area.The metasomatic residual structure of the ore re-flects the typical late hydrothermal origin.The deposit belongs to sedimentation-hydrothermal transforma-tion type.The subsequent prospecting should focus on the ore-controlling combination area of laminaceous limestone+fold+strike-slip ore-controlling fault in the second member of Shizhongshan Formation(T3s2).

关 键 词：兰坪盆地 河西锶矿床 矿床成因 找矿标志 

分 类 号：P618.78[天文地球—矿床学]