摘要
【研究目的】青山铅锌矿床地处扬子地块西南缘的黔西北矿集区威宁—水城成矿亚带中段,严格受构造控制,资源潜力巨大。基于前期资料综合分析及野外地质调研,发现矿区构造成生发展过程和构造控矿机理不清、深部找矿勘查方向不明等问题制约了找矿突破。【研究方法】本文应用矿田地质力学理论和方法,通过大比例尺构造剖面精测、不同方向控矿构造力学性质鉴定与不同期次、序次构造筛分,结合区域构造应力场变化特征,揭示了构造控矿机理。【研究结果】自印支期以来,该区的主压应力方向主要历经了北东-南西向→北西-南东向→北东-南西向→近东西向的转变过程,依次形成了早北西构造带、北东构造带、晚北西构造带、南北构造带(构造体系)。通过成矿构造解析及其与成矿关系讨论,厘定了北东构造带为该矿区的成矿构造体系,揭示了构造分级控矿规律:北西向威宁—水城断裂、威水背斜为矿区的一级控矿构造,控制了威宁—水城矿化带或矿田的展布;威宁—水城断裂扭动作用派生的北西向断裂F1、F2,控制了矿床(矿体群)的分布,为矿区的二级控矿构造;F1、F2断裂间的层间断裂破碎带,直接控制了矿体的形态和产状,为三级控矿构造;矿体旁侧的节理裂隙带控制矿脉,为四级控矿构造。【结论】青山铅锌矿床构造分级控矿规律明显,主要受四个等级的控矿构造控制,并形成了与其相对应的4种矿化样式。
[Objective]The Qingshan medium-size Pb-Zn deposit is located in the middle of the Weining-Shuicheng metallogenic sub-belt in the southwest margin of the Yangzi Block.The ore-body of the Qingshan deposit is strict controlled by structure and the resource potential is huge.[Methods]Based on the theory and method of orefield geomechanics,this research has revealed the mechanism of structural ore control by the fine survey of large-scale structural profile,the identification of mechanical properties of typical ore-controlling structures in different directions and the screening of structures in different periods and orders,combined with the characteristics of regional tectonic stress field.[Results]The results show that the principal compressive stress direction of the mining area since the Indosinian had changed from NE-SW-trending to NW-SE-trending to NE-SW-trending to near EW-trending,sequentially forming tectonic systems of the early NW tectonic belt,the NE tectonic belt,the late NW tectonic belt and the SN tectonic belt in turn.By the analysis of ore-controlling structure and the discussion of its relationship with mineralization,the metallogenic structural system of the north-east tectonic belt has been determined,and the hierarchical ore-controlling regularity of structure is revealed,it is,the northwest-trending Weining-Shuicheng fault and Weining-Shuicheng anticline are the first-grade ore-controlling structures,which control the distribution of the Weining-Shuicheng metallogenic sub-belt or orefield;The NW-trending faults(F1 and F2)derived from the Weining-Shuicheng fault,control the distribution of the deposit or orebody group,and are the second-grade ore-controlling structures in the mining area;The interlayer fracture zones between F1 and F2 faults directly control the feature and attitude of orebodies,which is the third-grade ore-controlling structure in the mining area;The joint fissures on the sides of orebodies control the ore-veins,which is the fourth-grade ore-controlling structure.[Conclusions]The
作者
宋丹辉
韩润生
王峰
王明志
何治
周威
罗达
SONG Danhui;HAN Runsheng;WANG Feng;WANG Mingzhi;HE Zhi;ZHOU Wei;LUO Da(Kunming University of Science and Technology,College of Land and Resources Engineering,Kunming 650093,Yunnan,China;Southwest Institute of Geological Survey,Geological Survey Center for Non-ferrous Mineral Resources,Kunming 650093,Yunnan,China;Yunnan Chihong Zinc and Germanium Co.,Ltd.,Qujing 655011,Yunnan,China;Guizhou Hongqiao Mining Group Co.LTD,Liupanshui 553000,Guizhou,China)
出处
《中国地质》
CAS
CSCD
北大核心
2024年第2期399-425,共27页
Geology in China
基金
国家自然科学基金项目(41572060)
云岭学者资助项目(2014)
云南省矿产资源预测评价工程实验室(2010)
云南省地质过程与矿产资源省创新团队项目(2012)联合资助。
关键词
控矿作用机理
成矿构造体系
构造控矿模式
矿产勘查启示
青山铅锌矿床
黔西北
矿产勘查工程
metallogenic tectonic system
ore-controlling mechanism
model of tectonic ore control
mineral exploration implication
Qingshan lead-zinc deposit
northwestern Guizhou Province
mineral exploration engineering
