滇西北羊拉铜矿床构造体系及其控岩控矿作用  

Ore-field structural system and its mechanism of rock-and ore-controlling processes of Yangla Cu deposit in northwest Yunnan,China

作　　者：李波[1] 王新富 岳言 黄智龙[2] 唐果[1,3] 刘月东 邹国富 向佐朋 LI Bo;WANG Xin-fu;YUE Yan;HUANG Zhi-long;TANG Guo;LIU Yue-dong;ZOU Guo-fu;XIANG Zuo-peng(Faculty of Land and Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China;Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co.,Ltd.,Kunming 650051,China;Yunnan Diqin Mining Industry Group,Shangrila 674400,China)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093 [2]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵阳550002 [3]中国有色金属工业昆明勘察设计研究院有限公司,昆明650051 [4]云南迪庆矿业开发有限责任公司,香格里拉674400

出　　处：《中国有色金属学报》2021年第9期2596-2611,共16页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(41862007,41402072);云南省万人计划青年拔尖人才项目(YNWR-QNBJ-2018-093);昆明理工大学重点学科建设项目(14078384)。

摘　　要：羊拉铜矿床是我国西南“三江”多金属成矿域内矽卡岩−斑岩型矿床的典型代表,为滇西北金沙江缝合带中生代构造−岩浆−成矿事件的产物。该矿床构造发育,形成了一套褶皱−断层控岩控矿体系。本文运用矿田地质力学方法对羊拉铜矿床构造形迹的几何学、运动学和力学性质进行解析,建立羊拉铜矿床的构造体系及其控岩控矿模式。结果表明:自海西期→印支期→燕山期→喜马拉雅期,羊拉铜矿床主压应力经历了东西向→北西向→北西向→(北东向→近东西向)的转变,依次形成了早南北构造带、北东构造带(早−晚)、(北西构造带和晚南北构造带)。早南北构造带为羊拉铜矿床控岩控矿构造的基础,早北东构造带为控制矽卡岩−斑岩成矿系统的主导构造,晚北东构造带、北西构造带和晚南北构造带为破岩破矿构造。根据构造体系及其控岩控矿作用,认为羊拉铜矿床构造控岩控矿模式为海西期“层间断裂”+印支期“侵入接触构造”+燕山期“λ字型构造”+喜马拉雅期“阶梯状构造”。The Yangla Cu deposit is located in northwest Yunnan,China and formed during the Mesozoic structure-magma-mineralization events,is one of the typical skarn-porphyry deposits in the Jinshajiang suture zone,“Sanjiang”polymetallic metallogenic domain.Well developed structures in the Yangla Cu deposit composed a typical folds-faults rock-and ore-controlling structural system,which constituted the skarn-porphyry metallogenic system.In this paper,the theory and method of ore-field geomechanics are used to analyze the geometry,kinematics and mechanical property of the structure traces in the Yangla Cu deposit,and to determine the ore-field structural system and its mechanism of rock-and ore-controlling model.The results show that the Yangla Cu deposit mainly experienced transformation of main constructional compressive stress from EW-to NW-to NW-to(NE-to nearly EW)trending,and formed the early NS,NE(early to late),NW,late NS structure belts in turn,since the Hercynian→Indochina→Yanshanian→Himalaya,and affected the Jianshajiang suture zone and Indian-Eurasian plates.It is believed that the early NS structure belt was the rock-and ore-controlling structural framework system in the Hercynian.The early NE structure belt was provided a favorable structural setting for the skarn-porphyry metallogenic system,which was the dominant ore-controlling structural system in the Indochina.In contrast,the late NE structure belt destroyed the rock and ore-bodies,which belong to rock-and ore-breaking structure in Yanshanian.The NW and late NS structure belts also destroyed the intrusions and ore-bodies,and belong to the rock-and ore-breaking structure in Himalaya.The corresponding structure rock-and ore-controlling model are successively the“Interlayer Faults”of the Hercynian,“Intrusion into Contact Faults”of the Indochina,“λ-Type Faults”of the Yanshanian,and“Stair-Step Faults”of the Himalaya,which based on the structural system and its rock-and ore-controlling structure type.

关 键 词：构造体系 控岩控矿构造 构造控矿模式 羊拉铜矿床 滇西北 

分 类 号：P613[天文地球—矿床学]