川西南大梁子铅锌矿床矿化蚀变分带规律与元素组合分带模型  

Mineralization-alteration zoning law and element compositional zoning pattern in mineralized altered rocks from the Daliangzi Pb-Zn deposit,southwestern Sichuan

作　　者：袁航 韩润生[1,2] 冯志兴[3] 吴鹏[1,2] 管申进 丁天柱 李凌杰 杨博 YUAN Hang;HAN Runsheng;FENG Zhixing;WU Peng;GUAN Shenjin;DING Tianzhu;LI Lingjie;YANG Bo(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Southwest Institute of Geological Survey,Geological Survey Center for Non-ferrous Metals Resources,Kunming 650093,Yunnan,China;West Mining Co.,Ltd,Xining 810001,Qinghai,China;Sichuan Huidong Daliang Mining Co.,Ltd,Liangshan Yi Autonomous Prefecture 615205,Sichuan,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]有色金属矿产地质调查中心西南地质调查所,云南昆明650093 [3]西部矿业股份有限公司,青海西宁810001 [4]四川会东大梁矿业有限公司,四川凉山彝族自治州615205

出　　处：《地质力学学报》2022年第3期432-447,共16页Journal of Geomechanics

基　　金：国家自然科学基金(42172086);“云岭学者”人才计划项目(2014);云南省矿产资源预测评价工程实验室项目(2010);云南省地质过程与矿产资源创新团队项目(2012)。

摘　　要：川西南大梁子铅锌矿床是川滇黔地区震旦系灯影组碳酸盐岩赋矿的后生热液型铅锌矿床的代表之一。针对该矿床矿化蚀变分带规律不清的现状,基于矿区内1884 m、1944 m、2004 m、2064 m中段1∶200矿化-蚀变岩相学填图,精细解剖了蚀变类型、强度及蚀变岩组构,总结了矿化蚀变的强弱变化、矿物共生组合、元素组合及其空间分带特征,揭示了不同矿化蚀变带特征元素含量的变化规律,构建了从铅锌矿体中心向赋矿围岩的矿化蚀变空间分带模式:中等硅化+白云石化角砾状铅锌矿石相带(Ⅰ带)→中等硅化+白云石化网脉状铅锌矿化相带(Ⅱ带)→强硅化+白云石化+方解石化+细脉至星点状黄铁矿化相带(Ⅲ带)→方解石化+炭质+黄铁矿化相带(Ⅳ带)。基于成矿元素、特征元素组合及其元素比值的变化特征研究,矿化指示元素在不同蚀变带中依次具有Pb-Zn-Cd→Pb-Zn-Ag-Cu(Sb)→Ag-Cu-As-Sb→As-Sb的水平分带规律,总结了矿化指示元素的变化趋势。该研究对该矿床深部找矿勘查和同类矿床矿化蚀变分带研究具有启示意义。The Daliangzi deposit in southwestern Sichuan is a representative epigenetic hydrothermal Pb-Zn deposit hosted by carbonate rocks of Sinian Dengying Formation in the Sichuan-Yunnan-Guizhou area.The mineralizationalteration zoning law of this deposit is still unclear.A mineralization-alteration petrographic mapping is carried out at a scale of 1∶200 in the middle sections of 1884 m,1944 m,2004 m and 2064 m in the mining area.The alteration type,intensity and altered rock fabric are carefully studied,and the mineralization-alteration intensity variation,mineral paragenesis,element compositional zoning characteristics are summarized.The results reveal the variation law of characteristic element contents in different mineralization-alteration zones,following the mineralization-alteration zoning pattern from the center of Pb-Zn ore body to host rock:medium silicification+dolomitization brecciated Pb-Zn ore facies belt(I)→medium silicification+dolomitization and stockwork Pb-Zn mineralization facies belt(Ⅱ)→strong silicification+dolomitization+calcitization+veined to star shaped pyritization facies belt(Ⅲ)→calcitization+carbonaceous+pyritization facies belt(IV).The variation characteristics of metallogenic elements,characteristic element compositions and element ratios show that the mineralization indicator elements follow the horizontal zoning law of Pb-Zn-Cd→Pb-Zn-Ag-Cu(Sb)→Ag-Cu-As-Sb→As-Sb in different alteration zones,and the variation trend of mineralization indicating elements is summarized.This study provides a reference to the deep prospecting and exploration in this deposit and studies on mineralization-alteration zoning of the same type of deposit.

关 键 词：矿化蚀变分带规律 元素组合分带 蚀变岩相学填图 大梁子铅锌矿床 川西南 

分 类 号：P575[天文地球—矿物学]