册亨百地金矿床方解石微量元素及C-H-O同位素地球化学特征

吴波; 吴治君; 赵明峰; 周克林; 彭慈刚; 潘有良; 斯恩智; 陆建宝

吴波,吴治君,赵明峰,周克林,彭慈刚,潘有良,斯恩智,陆建宝.册亨百地金矿床方解石微量元素及C-H-O同位素地球化学特征[J].贵州地质,2024,(4):410-421

册亨百地金矿床方解石微量元素及C-H-O同位素地球化学特征

Geochemical Characteristics of Trace Elements and C-H-O Isotopes of Calcite in Baidi Gold Deposit of Ceheng

投稿时间：2024-06-24

DOI：

中文关键词: 方解石微量元素 C-H-O同位素地球化学特征百地金矿床

英文关键词:Calcite Trace elements C-H-O isotope Geochemical characteristics Baidi gold deposit

基金项目:中国地质调查局地质调查项目(DD20190159-30)、贵州省地矿局地质科研项目(黔地矿科合〔2015〕06号、黔地矿科合〔2022〕08号、黔地矿科合〔2023〕3号、黔地矿科合〔2023〕12号)联合资助。

作者	单位
吴波	贵州省地质矿产勘查开发局117地质大队，贵州贵阳550018
吴治君	贵州省地质矿产勘查开发局117地质大队，贵州贵阳550018
赵明峰	贵州省地质矿产勘查开发局117地质大队，贵州贵阳550018
周克林	贵州省地质矿产勘查开发局117地质大队，贵州贵阳550018 中国科学院地球化学研究所，贵州贵阳550081
彭慈刚	贵州省地质矿产勘查开发局117地质大队，贵州贵阳550018
潘有良	贵州省地质矿产勘查开发局117地质大队，贵州贵阳550018
斯恩智	贵州省地质矿产勘查开发局117地质大队，贵州贵阳550018
陆建宝	贵州省地质矿产勘查开发局117地质大队，贵州贵阳550018

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中文摘要:

为了探讨成矿流体的来源及演化，深化黔西南卡林型金矿成矿作用的认识，笔者采集了百地金矿矿石主要脉石矿物之一，形成于热液成矿后期的方解石，开展微量(稀土)元素和C、H、O同位素地球化学研究。通过研究，方解石中Sb、As、Sr含量高，含有一定的W、Ni、Mo、Cu、Pb等中-高温元素，Li、Rb、Cs、Nb、Ta、Zr、Hf等稀有元素的亏损，说明成矿流体富Sb、As等元素，W来源于深部岩浆；稀土含量较低(9038×10-6108922×10-6)，ΣLREE/ΣHREE为016034，δEu值088167；呈现LREE亏损、MREE显著富集，正Eu异常，配分模式为“帽型”等特征；方解石δ13CPDB值-4219‰0863‰，δ18OSMOW值128‰228‰，δ18OH2O值118‰218‰之间，δDSMOW值-122‰-77‰之间；表明了成矿流体呈中等还原、弱酸性，具有壳源流体特征，为岩浆水、地层水及变质水的混合。

英文摘要:

In order to explore the source and evolution of ore-forming fluids and deepen the understanding of the mineralization of Carlin-type gold deposits in southwest Guizhou, calcite, one of the main gangue minerals in the Baidi gold deposit, was collected. This calcite was formed in the late stage of hydrothermal mineralization. Subsequently, trace (rare earth) elements and C, H, and O isotope geochemical studies were carried out. The study shows that calcite contains high concentrations of Sb, As, Sr, and Bi, as well as moderate to high-temperature elements such as W, Ni, Mo, Cu, and Pb while being depleted in rare elements such as Li, Rb, Cs, Nb, Ta, Zr, and Hf. This indicates that the ore-forming fluids are rich in elements such as Sb and As, with W originating from deep magma. The rare earth element (REE) content is relatively low (9.038×10-6 to 108.922×10-6), with ΣLREE/ΣHREE ratios ranging from 0.16 to 0.34, and δEu values from 0.88 to 1.67. The calcite exhibits characteristics such as LREE depletion and significant MREE enrichment, a positive Eu anomaly, and an upward convex distribution pattern. The δ13CPDB values of calcite range from -4.219‰ to 0.863‰, the δ18OSMOW values range from 12.8‰ to 22.8‰, the δ18OH2O values range from 11.8‰ to 21.8‰, and the δDSMOW values range from -122‰ to -77‰. These findings suggest that the ore-forming fluids are moderately reducing and weakly acidic, with characteristics of crustal fluids, indicating a mixture of magmatic water,formation water and metamorphic water.

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