中国东南部秦杭成矿带永平铜矿床的成因:硫化物地球化学和硫同位素数据的启示

IF 3.2 2区 地球科学 Q1 GEOLOGY Ore Geology Reviews Pub Date : 2024-09-14 DOI:10.1016/j.oregeorev.2024.106231
Defeng Shi , Shini Fan , Guixian Li , Yun Zhu , Qing Yan , Mengjie Jia , Mohamed Faisal
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引用次数: 0

摘要

永平铜矿是一个大型多金属矿,已探明的铜金属储量为 160 万吨,平均品位为 0.74%,为中国的铜产量做出了重要贡献。该矿床位于秦杭成矿带(中国东南部江西省)东部,地处长江铜-钼成矿带与江西W-Sn-RE成矿带的接触带。厚层状和透镜状矿体赋存于石炭纪叶家湾地层中,由砂岩、石灰岩、泥岩和富含碎屑岩的碎屑岩组成。主要含金属矿物为黄铜矿和黄铁矿,还有少量闪锌矿、四面体矿、方铅矿、辉钼矿、黄铁矿、磁铁矿、赤铁矿和白钨矿。过去三十年来,虽然对其地质环境、地球化学特征和地球动力演化进行了深入研究,但其成因和沉积环境仍存在争议。本研究利用 LA-ICP-MS 技术对硫化物矿物进行了原位微量元素地球化学和硫同位素分析,并结合显微镜观察进行了研究。结果表明,永平黄铁矿富含 Co、As、Ni、Zn、Cu 和 Te,其他微量元素贫乏。闪锌矿富含铁、锰、铜和镉,其次是铟、钴和镓。公式 T(°C) = (Fe/Zn + 0.2953)/(0.0013) 的计算结果显示,闪锌矿是在中高温条件下(262 °C-377 °C)形成的。所研究的硫化物(黄铁矿、黄铜矿、闪锌矿和四闪锌矿)的δ34SV-CDT值在-1.52‰至5.13‰之间变化,平均值为2.36‰,与狮子头斑状生物花岗岩储量的δ34SV-CDT值(2.20‰至4.5‰)高度一致,表明主要来源于岩浆。总之,永平地区分析的闪锌矿和黄铁矿的微量元素组成表现出典型矽卡岩矿床的特征。结合之前的研究,我们可以得出结论:永平铜矿床很可能是侏罗纪火烧岗-狮子头花岗岩群侵入石炭纪叶家湾地层后接触变质作用形成的矽卡岩矿床。
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Genesis of Yongping copper deposit in the Qin-Hang Metallogenic Belt, SE China: Insights from sulfide geochemistry and sulfur isotopic data

Yongping copper deposit is a large-scale polymetallic mine that contains 1.6 Mt of proven Cu metal reserves with an average grade of 0.74 % and contributes significantly to China’s production of copper. This deposit is situated in the eastern part of the Qin-Hang Metallogenic Belt (Jiangxi province, SE China) at the contact zone between the Yangtze Cu–Mo metallogenic belt and the Jiangxi W–Sn–REE metallogenic belt. The thick stratiform and lenticular-shaped orebodies are hosted in the Carboniferous Yejiawan Formation, consisting of sandstone, limestone, mudstone, and chert-rich clastic rocks. Dominant metal-bearing minerals are chalcopyrite and pyrite with a minor amount of sphalerite, tetrahedrite, galena, molybdenite, pyrrhotite, magnetite, hematite, and scheelite. Although intensive research has been done on its geological setting, geochemical characteristics, and geodynamic evolution over the past thirty years, the origin and depositional environments have remained controversial. In the current research, in situ trace element geochemistry and sulfur isotope analyses, coupled with microscopic investigation, were conducted on sulfide minerals using the LA-ICP-MS technique. The results display that Yongping pyrite rich in Co, As, Ni, Zn, Cu, and Te and deplete in other trace elements. Sphalerite rich in Fe, Mn, Cu, and Cd, followed by In, Co and Ga. The calculation results of formula T(°C) = (Fe/Zn + 0.2953)/(0.0013) reveal that sphalerite was formed in medium–high temperature conditions (262 °C–377 °C). The δ34SV-CDT values of studied sulfides (pyrite, chalcopyrite, sphalerite, and tetrahedrite) varied from −1.52 ‰ to 5.13 ‰ with an average of 2.36 ‰, which are highly consistent with those recorded from porphyritic biotite granite stock of Shizitou (from 2.20 ‰ to 4.5 ‰), suggesting a dominantly magmatic origin. Collectively, trace element compositions of analyzed sphalerite and pyrite from the Yongping area exhibit characteristics of typical skarn deposits. Combined with previous studies, we can conclude that the Yongping Cu deposit is a skarn deposit that was most likely formed by contact metasomatism after the intrusion of the Jurassic Huoshaogang-Shizitou granitic stock into the Carboniferous Yejiawan Formation.

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来源期刊
Ore Geology Reviews
Ore Geology Reviews 地学-地质学
CiteScore
6.50
自引率
27.30%
发文量
546
审稿时长
22.9 weeks
期刊介绍: Ore Geology Reviews aims to familiarize all earth scientists with recent advances in a number of interconnected disciplines related to the study of, and search for, ore deposits. The reviews range from brief to longer contributions, but the journal preferentially publishes manuscripts that fill the niche between the commonly shorter journal articles and the comprehensive book coverages, and thus has a special appeal to many authors and readers.
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