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引用本文:张忠坤,林彬,陈国良,邹兵,杨征坤,唐攀,高昕,祁婧,李发桥,高福太,焦海军,孙建军,李亚军,苏伟. 西藏甲玛超大型矿床南坑厚大矽卡岩矿体的成岩-成矿-构造耦合关系[J]. 中国地质, 2021, 48(6): 1804-1817.
ZHANG Zhongkun,LIN Bin,CHEN Guoliang,ZOU Bing,YANG Zhengkun,TANG Pan,GAO Xin,QI Jing,LI Faqiao,GAO Futai,JIAO Haijun,SUN Jianjun,LI Yajun,SU Wei. The diagenesis-mineralization-structure coupling relationship of South-Pit skarn thick ore body in the Jiama super large-sized deposit, Tibet[J]. Geology in China, 2021, 48(6): 1804-1817(in Chinese with English abstract).
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西藏甲玛超大型矿床南坑厚大矽卡岩矿体的成岩-成矿-构造耦合关系
张忠坤1, 林彬2,3, 陈国良1, 邹兵3, 杨征坤1, 唐攀4, 高昕5, 祁婧6, 李发桥6, 高福太1, 焦海军1, 孙建军1, 李亚军1, 苏伟1
1.西藏华泰龙矿业开发有限公司, 西藏 拉萨 850212;2.中国地质科学院矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037;3.加拿大拉瓦尔大学地质与地质工程系, 加拿大 魁北克 G1V0A6;4.西南交通大学地球科学与环境工程学院, 四川 成都 611756;5.安徽省地质调查院, 安徽 合肥 230001;6.中国地质大学(北京)地球科学与资源学院, 北京 100083
摘要:
甲玛是西藏冈底斯成矿带规模大、品位富的超大型矿床,也是勘查和研究程度最高的矿床之一。其中,南坑矿段由于富含高品位的矽卡岩型铜铅锌矿石,且具大型规模,已被纳入矿区首采矿段之一,然而关于其控岩控矿机制以及其与主矿段的耦合关系却仍不明确。本次基于详细的钻孔编录和野外地质证据,判定其成矿作用与中新世的花岗闪长斑岩等中酸性斑岩体有关,结合高精度的U-Pb年代学分析,厘定含矿花岗闪长斑岩结晶年龄为(15.5±0.3)Ma,与辉钼矿成矿年龄(15.23±0.22)Ma一致。南坑矿段作为甲玛矿床多中心复合成矿作用模型的重要组成部分,其矽卡岩矿体主要产于林布宗组角岩与多底沟组大理岩之间的层间接触带,属于中新世岩浆热液活动的产物。矿体形成后,受滑覆构造及次级断裂影响,矿体发生错断或破坏。对于南坑矿段后续的勘查评价,应注意与含矿斑岩和矽卡岩的蚀变与矿化分带特征,定位致矿热液中心。
关键词:  成岩时代  构造  南坑矿段  矿产勘查工程  甲玛  西藏
DOI:10.12029/gc20210612
分类号:P618.41
基金项目:国家重点研发计划-深地专项(2018YFC0604101)、中国地质科学院基本科研业务费专项经费项目(KK2116,KJ2102)、西藏自治区科技计划项目(XZ201901-GB-24)、国家自然科学基金项目(41902097)、国家留学基金委项目和中国地质调查局项目(DD20190167)联合资助。
The diagenesis-mineralization-structure coupling relationship of South-Pit skarn thick ore body in the Jiama super large-sized deposit, Tibet
ZHANG Zhongkun1, LIN Bin2,3, CHEN Guoliang1, ZOU Bing3, YANG Zhengkun1, TANG Pan4, GAO Xin5, QI Jing6, LI Faqiao6, GAO Futai1, JIAO Haijun1, SUN Jianjun1, LI Yajun1, SU Wei1
1.Tibet Huatailong Ming Corp. Ltd., Lhasa 850212, Tibet, China;2.MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;3.Department of Geology and Geological Engineering, University Laval, QC G1V0A6, Canada;4.Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China;5.Geological Survey of Anhui Province, Hefei 230001, Anhui, China;6.School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
Abstract:
The Jiama deposit is one of super large-sized deposits with high grade and one of the most explored and studied deposits in the Gangdese metallogenic belt of Tibet. Because the South-Pit segment host large-sized skarn Cu-Pb-Zn ore bodies with high-grade, it has been given priority to mining. However, its diagenesis, mineralization and the relationship with main segment are still unclear. Based on detailed borehole logging and field geological evidences, it is determined that the mineralization is related to intermediate-felsic porphyries. The high-precision U-Pb dating of ore-bearing granodiorite porphyry yields the age of 15.5±0.3 Ma, which is consistent with the Re-Os age of molybdenite (15.23±0.22Ma). As the important part of Jiama polycentric complex mineralization model, the skarn ore body in South-Pit segment is mainly distributed on the contact between marble and hornfels. The skarn should be the result of Miocene magmatism and destroyed by the slide nappe fault and secondary faults. For the future exploration in South-Pit, more attention should be paid to the study of alteration and mineralization of ore-bearing porphyry and skarn, and to the locating of the ore-related fluid center.
Key words:  Diagenetic age  structure  South-Pit ore segment  mineral exploration engineering  Jiama  Tibet