投稿时间：2024-10-27
修订日期：2024-11-19
网络发布日期：2025-01-07
中文摘要:冈底斯成矿带是中国重要的铜多金属矿带，发育众多大陆碰撞后伸展环境的斑岩型铜多金属矿床。成矿带内藏西北陆相火山岩区是寻找斑岩-浅成低温热液铜金矿床的理想勘查区。最近，笔者所在研究团队在新一轮找矿突破战略行动项目资助下，在西藏阿里革吉县芒拉地区新发现厚大高品位铜（金、银）矿体，首孔MLZK0001见矿厚度137 m，铜平均品位达0.46%，其中，铜品位大于1%的样品有14件，平均1.54%；目前完钻的3个钻孔深度在542~709.9 m之间，仍发育连续的铜、金、银矿化。芒拉铜（金、银）矿蚀变矿物组合为多孔状石英、明矾石、高岭石、地开石、叶腊石等高硫化体系蚀变矿物，金属矿物主要为硫砷铜矿、黝铜矿、黄铜矿和铜蓝、蓝辉铜矿等Cu-S二元体系矿物，深部斑岩型铜金矿化和斑岩成矿系统目前尚未揭露。芒拉铜（金、银）矿是冈底斯成矿带西段发现的首例产于中新世陆相火山岩中的斑岩（?）-高硫化浅成低温热液型铜（金、银）矿床，该隐伏的厚大铜（金、银）矿体的发现，表明藏西北陆相火山岩区具有寻找斑岩-高硫化浅成低温热液铜金矿床的巨大潜力，将冈底斯成矿带向西延伸了近千km，开辟了在中新世火山岩区寻找斑岩-浅成低温热液型铜金矿的新方向。
Abstract:The Gangdese metallogenic belt is an important Cu polymetallic deposit belt in China，with numerous porphyry Cu polymetallic deposits developed in continental post-collisional extensional setting. The continental volcanic rock area in northwestern Xizang is considered as an ideal exploration area for searching porphyry-epithermal Cu-Au deposits. Under the support of New Strategic Action of Ore-prospecting Breakthrough，we newly discovered a thick Cu (Au, Ag) ore body with high-grade in the Mangla area of Geji County in Ngari Prefecture，Xizang. The first drill hole of MLZK0001 shows an ore thickness of 137 meters with average Cu grade of 0.46%. There are 14 samples with w(Cu) more than 1%，with an average of 1.54%. The current depths of the three drilled holes range from 542 m to 709.9 m, with ongoing continuous mineralization of Cu (Au, Ag). The altered mineral assemblages of Mangla Cu (Au, Ag) deposit show high-sulfidation epithermal system features with vuggy quartz，alunite，kaolinite，dickite，pyrophyllite and others. The metal minerals are mainly enargite, tetrahedrite, chalcopyrite，and Cu-S binary system minerals such as covellite and digenite. The deep porphyry Cu-Au mineralization and porphyry metallogenic system have not been revealed yet. The Mangla Cu (Au, Ag) deposit is the first (porphyry?)-high sulfidation epithermal Cu-Au deposit developed in the Miocene continental volcanic rocks in the western section of the Gangdese metallogenic belt so far. The discovery of concealed thick Cu (Au, Ag) ore body indicates that the continental volcanic rock area in northwestern Xizang has great potential for searching porphyry-high sulfidation epithermal Cu-Au deposits, which stretched the Gangdese metallogenic belt westward for approximately one thousand kilometers. It also provides a new direction for exploring porphyry-epithermal Cu-Au deposits in Miocene volcanic rocks.
keywords:epithermal porphyry Cu (Au,Ag) deposit Gangdese metallogenic belt continental volcanic rock prospecting breakthrough
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基金项目:本文得到中国地质调查局项目（编号：DD20230054、DD20230358和DD20230286），国家自然科学基金（编号：42230813），中国地质科学院基本科研业务费专项经费（编号：JKYQN202331、KK2321），新一轮找矿突破战略行动科技支撑项目（编号：ZKKJ202429）共同资助
引用文本：
王楠,刘治博,唐菊兴,宋扬,李宝龙,马旭东,闫徐坤,李志军,代晶晶,孙清飞,张梦虎,吕晓强,肖扬.2024.冈底斯成矿带西段首次发现中新世高硫化浅成低温热液型铜（金、银）矿床[J].矿床地质,43(6):1461~1466WANG Nan,LIU ZhiBo,TANG JuXing,SONG Yang,LI BaoLong,MA XuDong,YAN XuKun,LI ZhiJun,DAI JingJing,SUN QingFei,ZHANG MengHu,Lü XiaoQiang,XIAO Yang.2024.First identification of Miocene high-sulfidation epithermal copper （gold，silver） deposit in western section of Gangdese metallogenic belt[J].Mineral Deposits43(6):1461~1466
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