四川会东淌塘铜矿矿床地质特征及找矿标志
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摘要
淌塘铜矿为四川会理—会东铜多金属矿集区内的层控型矿床之一,发育典型的"东川(淌塘)式"铜矿。为进一步指导淌塘铜矿床深、边部接替资源找矿工作,分析了区域成矿地质背景,并依据淌塘铜矿床的最新地质勘查结果,深入分析了矿体产出特征、矿物组构特征、蚀变特征等,并对矿床成因进行了讨论,对找矿标志进行了总结。研究表明:(1)矿区出露的地层以前震旦系会理群淌塘组(Pt_2t)变质岩系为主,岩性主要为千枚岩及白云质大理岩;(2)矿体均赋存于淌塘组中亚组第二段中层(Pt_2t_2~(2-2))内,呈层状、似层状及透镜状产出,矿体厚度及品位变化较均匀;(3)矿床内的金属矿物以黄铜矿、黄铁矿为主,发育浸染状、条带状、网脉状矿石构造,显示沉积及热液成矿特征;(4)赋矿围岩作为初始矿源层,在后期热液作用下进一步活化迁移,沿断裂及破碎带充填叠加,矿床成因类型为沉积—改造型铜矿床;(5)矿区地层、构造、蚀变及地球化学异常为重要的找矿标志。
Tangtang copper deposit is one of the strata-bound type deposits in Huili-Huidong copper polymetallic ore-concentrating area,which occurred typical " Dongchuan( Tangtang) type" copper deposit. In order to provide reference for the deep/edge prospecting work of the Tangtang copper deposit,the regional metallogenic geological background is analyzed,based on the geological exploration results newly obtained in the mining area,the ore-bodies occurrence characteristics,mineral fabric features and alteration characteristics are discussed in detail,besides that,the deposit genesis is studied and the prospecting indicators of the mining area are also summarized systematically. The study results show that:(1)the strata occurred in the mining area is mainly for the metamorphic rock series in Tangtang Formation( Pt_2t) of Huili Group of Early Sinian,which developes phyllite and dolomite marble;(2)the ore-bodies are occurred in middle layer of the second stage of Middle Tangtang Formaiton( Pt_2t_2~(2-2)),which is characterized by layered,stratiform-like and lenticular,the grade and thickness of the ore-bodies changed evenly;(3)the metallic minerals of the copper deposit are mainly for chalcopyrite and pyrite,which develop the dissemination ore structure,streaked ore structure and net-vein ore structure,and show the sedimentary metallogenic feature and hydrothermal metallogenic feature;(4)the ore-hosting rock are effected on activation and transportation by late tectonic hydrothermal solution,and superimposed along the faults and fracture zone,acting as main source bed,the deposit genesis is belongs to sedimentary-reformation type copper deposit;(5)the strata,structure,alteration and geochemical anomaly can be regarded as the favorable prospecting indicators in the mining area.
Tangtang copper deposit is one of the strata-bound type deposits in Huili-Huidong copper polymetallic ore-concentrating area,which occurred typical " Dongchuan( Tangtang) type" copper deposit. In order to provide reference for the deep/edge prospecting work of the Tangtang copper deposit,the regional metallogenic geological background is analyzed,based on the geological exploration results newly obtained in the mining area,the ore-bodies occurrence characteristics,mineral fabric features and alteration characteristics are discussed in detail,besides that,the deposit genesis is studied and the prospecting indicators of the mining area are also summarized systematically. The study results show that:(1)the strata occurred in the mining area is mainly for the metamorphic rock series in Tangtang Formation( Pt_2t) of Huili Group of Early Sinian,which developes phyllite and dolomite marble;(2)the ore-bodies are occurred in middle layer of the second stage of Middle Tangtang Formaiton( Pt_2t_2~(2-2)),which is characterized by layered,stratiform-like and lenticular,the grade and thickness of the ore-bodies changed evenly;(3)the metallic minerals of the copper deposit are mainly for chalcopyrite and pyrite,which develop the dissemination ore structure,streaked ore structure and net-vein ore structure,and show the sedimentary metallogenic feature and hydrothermal metallogenic feature;(4)the ore-hosting rock are effected on activation and transportation by late tectonic hydrothermal solution,and superimposed along the faults and fracture zone,acting as main source bed,the deposit genesis is belongs to sedimentary-reformation type copper deposit;(5)the strata,structure,alteration and geochemical anomaly can be regarded as the favorable prospecting indicators in the mining area.
引文
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[13]冯兴隆,吴东旭,李剡兵,等.基于DIMINE三维数字矿山软件系统的淌塘铜矿六中段开采方法研究[J].湖南有色金属,2013,29(1):1-7.
[14]张道涵,魏俊浩,付乐兵,等.贺兰山北段牛头沟金矿床成矿流体和成矿物质来源:来自H-O-S-Pb同位素[J].大地构造与成矿学,2017,41(2):325-337.
[15]王如钢.扬子地台康滇地轴中段东缘铜矿成矿作用研究——四川会东淌塘铜矿床为例[J].世界有色金属,2017(12):71-72.
[2]牟传龙,林仕良,余谦.四川会理—会东及邻区中元古界昆阳群沉积特征及演化[J].沉积与特提斯地质,2000,20(1):44-51.
[3]寇林林,张森,钟康惠.四川大梁子和天宝山铅锌矿床地球化学差异及地质意义[J].地质与资源,2015,24(1):26-32.
[4]宋昊,倪师军,张成江,等.康滇地轴基底IOCG铜铁矿床中岩浆岩的成矿及找矿指示意义[J].矿物学报,2015(S):156-157.
[5]黄从俊,李泽琴,王奖臻,等.康滇地轴元古代拉拉IOCG矿床铅同位素地球化学特征[J].矿物学报,2013(S):585-587.
[6]周家云,郑荣才,朱志敏,等.拉拉铜矿含矿岩系地球化学特征及其构造意义[J].矿产与地质,2009,23(2):163-171.
[7]陈颖,张成江.拉拉铜矿床矿石组构及微量元素地球化学特征[J].地球科学进展,2012(S):154-157.
[8]丁西同,周四春,朱剑,等.拉拉铜矿外围红泥坡—板山头地区找矿靶区优选[J].有色金属(矿山部分),2015,67(2):32-26.
[9]李云峰.会东淌塘铜矿矿床成因分析及其找矿方向[J].采矿技术,2009,9(5):144-148.
[10]邓波,叶志青,李金忠.基于双频激电法的淌塘铜矿成矿远景区预测[J].现代矿业,2016(6):112-117.
[11]吕锋明,刘国庆,刘恒.四川省会东地区淌塘铜矿床成矿条件分析[J].矿床地质,2014(S):953-954.
[12]冯兴隆,李德,吴东旭,等.淌塘铜矿三维可视化建模及应用[J].中国矿山工程,2011,40(6):1-5.
[13]冯兴隆,吴东旭,李剡兵,等.基于DIMINE三维数字矿山软件系统的淌塘铜矿六中段开采方法研究[J].湖南有色金属,2013,29(1):1-7.
[14]张道涵,魏俊浩,付乐兵,等.贺兰山北段牛头沟金矿床成矿流体和成矿物质来源:来自H-O-S-Pb同位素[J].大地构造与成矿学,2017,41(2):325-337.
[15]王如钢.扬子地台康滇地轴中段东缘铜矿成矿作用研究——四川会东淌塘铜矿床为例[J].世界有色金属,2017(12):71-72.