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首页> 外文期刊>Journal of Geochemical Exploration: Journal of the Association of Exploration Geochemists >Geology, fluid inclusion, and stable isotope systematics of the Dongyang epithermal gold deposit, Fujian Province, southeast China: Implications for ore genesis and mineral exploration
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Geology, fluid inclusion, and stable isotope systematics of the Dongyang epithermal gold deposit, Fujian Province, southeast China: Implications for ore genesis and mineral exploration

机译：福建省东阳膜金矿床地质，流体包容性和稳定同位素系统，东南部：对矿石创世纪和矿产勘探的影响

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摘要

The Dongyang gold deposit is a recently discovered large gold deposit located within the Dehua-Youxi-Yongtai mining camp in central-east Fujian Province, southeast China. The deposit contains two individual ore sections: the northwestern Jitou section and the southeastern Dadongkeng section. Most of the mineralization is hosted by rhyolite porphyry and volcanic rocks of the Nanyuan Formation. The locations of subvolcanic intrusions in this area are controlled by NE-SW and NW-SE trending faults that are also closely related to mineralization. Detailed drillhole logging and adit mapping indicates that the deposit contains massive, polymetallic quartz-sulfide veins, and cryptoexplosive breccia type ores. Ore minerals consist of gold, electrum, silver minerals, pyrite, marcasite, and arsenopyrite with lesser amounts of sphalerite and chalcopyrite. The mineralization is hosted by quartz, sericite, illite, chalcedony, and calcite gangue and is associated with sericite and argillic alteration as well as silicification. Fluid inclusion microthermometry indicates that the inclusions within quartz from auriferous quartz-sulfide veins formed during the main stage of mineralization and homogenize at temperatures (T-h) of 172 degrees C-217 degrees C (average of 192 degrees C) and have salinities of 0.4-2.6 wt% NaCl equivalent These low to moderate temperatures and low salinities suggest that the mineralization occurred in an epithermal environment The precipitation of gold mineralization at Dongyang was most likely caused by the mixing of a large amount of meteoric fluid with a smaller amount of magmatic fluid. Quartz-hosted fluid inclusions have H and O isotope compositions (delta D-H2O = -63.1 to - 54.2 parts per thousand; delta O-18(H2O) = -5.7 parts per thousand to -3.8 parts per thousand) that are indicative of derivation from a predominantly meteoric source. The S isotope values of pyrite vary from a narrow range of - 3.4 parts per thousand to 0.9 parts per thousand, suggesting that the S within the deposit was derived from a homogeneous magmatic source. The mineralization and alteration, gangue and ore mineral assemblages, fluid inclusion and H-O-S isotope compositions indicate that the Dongyang gold deposit is a low-sulfidation epithermal-type deposit The estimated ore formation depth of Donyang is nearly identical to its actual depth, indicating minor denudation in the region. These results imply a great prospecting potential for other epithermal mineralization at the Dehua-Youxi-Yongtai mining camp.
机译：东阳金矿床是最近发现的大型金矿床，位于中国东南部的中东福建省Dehua-Youxi-Yongtai采矿营地。该矿床包含两个单独的矿石部分：西北部九口段和东南部的东南部。大多数矿化由南苑形成的流石岩斑岩和火山岩。该区域中亚氰入侵的位置由NE-SW和NW-SE趋势故障控制，其与矿化密切相关。详细的钻孔测井和Adit映射表明矿床包含大规模的，多金属石英 - 硫化物静脉和密码爆发性Breccia型矿石。矿石矿物质由金，电，银矿物质，黄铁矿，马基酯和亚苯甲酸盐等组成，具有较少量的斯巴尔和硫代铜矿。矿化由石英，绢云母，伊利米特，龙糖胺和方解石甘蓝托管，与绢云母和纤毛改变以及硅化相关。流体包容性微温表明石英内的夹杂物在矿化的主阶段形成的耳芳瑞氏 - 硫化物静脉，并在172℃-217℃的温度（Th）（192℃）的温度（Th）均匀化并且盐度为0.4- 2.6重量％NaCl当量这些低温度和低盐素表明，矿化发生在膜状环境中，东阳金矿化的降水最有可能由大量的岩浆液混合造成较少量的岩浆流体引起的。石英宿主的流体夹杂物具有H和O同位素组合物（Delta D-H2O = -63.1至-54.2份每千份; Delta O-18（H2O）= -5.7个零件每千至-3.8份每千份），这是指示的从主要的陨石源衍生。黄铁矿的S同位素值因窄范围 - 3.4份千分之一至0.9份每千份而异，表明沉积物内的S源自均匀的岩浆源。矿化和改变，煤矸石和矿石矿物组合，流体包容性和HOS同位素组合物表明，东阳金矿床是一种低硫化术术沉积物，Donyang的估计矿石形成深度几乎与其实际深度相同，表明轻微剥蚀在该区域。这些结果意味着Dehua-Youxi-Yongtai采矿营地区其他曲线矿化的巨大勘探潜力。

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  • 来源
  • 作者

    Li Su-Ning; Ni Pei; Bao Tan; Li Chang-Ze; Xiang Hong-Liang; Wang Guo-Guang; Huang Bao; Chi Zhe; Dai Bao-Zhang; Ding Jun-Ying;

  • 作者单位

    Nanjing Univ Sch Earth Sci &

    Engn Inst Geofluids State Key Lab Mineral Deposits Res Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Earth Sci &

    Engn Inst Geofluids State Key Lab Mineral Deposits Res Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Earth Sci &

    Engn Inst Geofluids State Key Lab Mineral Deposits Res Nanjing 210093 Jiangsu Peoples R China;

    Fujian Yangxing Min Co Ltd Dehua 362509 Peoples R China;

    Fujian Shuangqishan Min Co Ltd Dehua 362509 Peoples R China;

    Nanjing Univ Sch Earth Sci &

    Engn Inst Geofluids State Key Lab Mineral Deposits Res Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Earth Sci &

    Engn Inst Geofluids State Key Lab Mineral Deposits Res Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Earth Sci &

    Engn Inst Geofluids State Key Lab Mineral Deposits Res Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Earth Sci &

    Engn Inst Geofluids State Key Lab Mineral Deposits Res Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Earth Sci &

    Engn Inst Geofluids State Key Lab Mineral Deposits Res Nanjing 210093 Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地球化学勘探;
  • 关键词

    Epithermal gold deposit; Low sulfidation; Fluid inclusions; Stable isotopes; Dongyang; Southeast China;

    机译：膜状金矿床;低硫化;流体夹杂物;稳定同位素;东阳;中国东南部;

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