粤东莲花山断裂带动力变质作用与动力变质热液成矿  

Dynamic Metamorphism Origin for the Tin-Copper Polymetallic Mineralization in the Lianhuashan Fault, Eastern Guangdong Province

作　　者：汪礼明 王军 王核[2] 卜安 李莎莎 钱龙兵 王玮 WANG Liming;WANG Jun;WANG He;BU An;LI Shasha;QIAN Longbing;WANG Wei(Geology Bureau for Nonferrous Metal of Guangdong Province,Guangzhou 510080,Guangdong,China;Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;Geology Bureau for Nonferrous Metal of Guangdong Province 931 Battalion,Shantou 515047,Guangdong,China)

机构地区：[1]广东省有色金属地质局,广东广州510080 [2]中国科学院广州地球化学研究所,广东广州510640 [3]广东省有色金属地质局九三一队,广东汕头515047

出　　处：《大地构造与成矿学》2018年第5期908-917,共10页Geotectonica et Metallogenia

基　　金：中国地质调查局地质调查项目(12120114008701;12120114015901)资助

摘　　要：莲花山断裂带是广东省内已知最重要的锡铜多金属成矿带,仅在其南西段200 km范围内分布的北山嶂–九龙嶂、棉洋–双华、五指嶂–锅子嶂、梅陇–鲘门–观音山4个动力变质带中就已探明有大、中型锡多金属矿床7处,前人将这类矿床类型归结为岩浆热液矿床或斑岩型矿床。本文通过对新发现的金坑锡铜多金属矿床地质、岩石地球化学等特征分析,探讨动力变质热液与成矿的关系和机理,研究表明该类矿床产出位置严格受到动力变质带的控制,矿体主要沿着片理化、面理化分布,局部切割了早期片理;与成矿密切相关的蚀变主要有石榴石化、硅化和绿泥石化,属于动力变质热液改造矿床。动力变质热液成矿发生在晚侏罗世的左行剪切动力变质作用过程中,而成矿物质主要来自上侏罗统高基坪群火山岩。现产于4个动力变质带的矿床及矿点成因大多属同一类别,且存在巨大的找矿空间,通过进一步勘查工作本区有望成为华南地区乃至全国重要的锡铜多金属成矿带。The Lianhuashan fault is the most important tin and copper polymetallic ore belt in Guangdong province.Seven medium-to large-sized ore deposits have been found in the southwest part of the Lianhuashan fault which is about 200 km long and consists of four dynamic metamorphic belts.The geological and geochemical characteristics of the newly discovered Jinkeng tin polymetallic deposit demonstrated a genetic relationship between the dynamic metamorphism and the hydrothermal mineralization,which contrasts with the hypothesis of magmatic hydrothermal origin previously proposed by other researchers.A dynamic metamorphic hydrothermal origin for the Jinkeng deposit is supported by geological evidence such as 1)the orebodies are strictly controlled by the dynamic metamorphic belts;2)the ore veins mainly occur along the sheet,plane and occasionally cut the early cleavage;3)ore-related alteration includes garnetization,silicification,and chloritization.These deposits are dynamic metamorphic hydrothermal origin related to the late Jurassic left-lateral shear dynamic metamorphism,and the ore metals are mainly derived from the volcanic rocks of the Upper Jurassic Gaojiping Group.In light of our new metallogenetic model,the Lianhuashan fault is very promising for ore prospecting,and possibly becomes one of the most economically significant Sn-Cu ore belts in South China.

关 键 词：莲花山断裂带 锡铜多金属矿床 动力变质热液成矿 找矿预测 

分 类 号：P611[天文地球—矿床学]