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首页> 外文期刊>Journal of Geochemical Exploration: Journal of the Association of Exploration Geochemists >Geology and fluid inclusion geochemistry of the Zijinshan high-sulfidation epithermal Cu-Au deposit, Fujian Province, SE China: Implication for deep exploration targeting
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Geology and fluid inclusion geochemistry of the Zijinshan high-sulfidation epithermal Cu-Au deposit, Fujian Province, SE China: Implication for deep exploration targeting

机译：福建省紫金山高硫酸综合化学的地质和流体包涵体地球化学，福建省，SE中国：深度勘探靶向的含义

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摘要

The giant Zijinshan Cu-Au deposit in the Zijinshan orefield, Fujian Province, southeastern China, is the first high-sulfidation epithermal deposit identified in mainland China. The Cu and Au orebodies occur as veins and pods in the NW-trending faults and breccias zones. Intensive and pervasive alteration is characterized by downward and outward zoning from intensively leached silicic alteration (or vuggy quartz, Q), through alunite-quartz-pyrite alteration (advanced aragillic alteration, Q-Alu) and the quartz-alunite alteration overprinting the sericite alteration (Q-Alu-Di-Srt), to sericite (or phyllic) alteration zone. Gold mineralization mainly occurs in the silicic alteration zone, while the copper mineralization is confined in the alunite-quartz alteration zone. On the basis of detailed petrographic study, an early porphyry type mineralization stage, characterized by chalcopyrite-bornitemolybdenite- pyrite-sericite assemblage is recognized at Zijinshan, which is subsequently and strongly overprinted by the sulfate alteration and high-sulfidation Cu-Au mineralization stages. A supergene stage is also identified at shallow depth of the deposit, with gold largely enriched but copper commonly leached. The ore-forming fluids related to the early sericite alteration and possibly porphyry type mineralization are high-temperature, high-salinity magmatic water, characterized by the presence of the halite-bearing inclusions. The CO2H2O (C-type) inclusions are mostly vapor-rich and abundantly identified in the samples with advance argillic alteration (alunite alteration). They are regarded to be the buoyant vapor phase by fluid boiling of a single-phase, low-to moderate-salinity magmatic fluid at depth, where a separated saline phase and related porphyry mineralization might be expected. A group of secondary inclusions coexisting with enargite grains are recognized in the samples with alunite alteration and suggested to be trapped from the ore-forming fluids of the Cu-Au mineralization stage. The total homogenization temperatures and salinities of the secondary inclusions are below 300 degrees C (peaking at 260-280 degrees C) and under 10 wt% NaCl eqv., respectively. Intensive fluid boiling is the major mechanism for the formation of the giant high-sulfidation Cu (covellite-, digenite-dominated) orebodies in the Zijinshan deposit. It is a deep-seated high-sulfidation epithermal deposit according to the estimated depth of 1.4-2.1 km from the C-type inclusions in quartz grains from the alunite alteration zone. By fluid inclusion mapping of a nearly NW-trending cross section profile, the isotherms are extrapolated using the average total homogenization temperatures and the possible heat source is suggested. It is indicated that the heat source and possible concealed porphyry mineralization nearly coeval to the high-sulfidation Cu-Au mineralization at Zijinshan might be located at the southeastern Zijinshan deposit or the northern area between the Zijinshan and Wuziqilong deposits, where deep drilling is encouraged.
机译：中国东南部的紫竹山厄菲尔德省巨津山铜矿矿床是中国大陆确定的第一个高硫化术术沉积物。 Cu和Au orebodies在NW趋势断层和BECCIAS区域中作为静脉和荚。密集和普遍的改变的特点是从集中浸出的硅改变（或vuGGY石英，Q）向下和向外分区，通过大使 - 石英 - 黄铁矿改变（先进的aragillic改变，Q-Alu）和石英 - alunite改变叠印绢云母改变（Q-Alu-Di-SRT），氨基石（或文学）改变区。金矿化主要发生在硅状改动区，而铜矿化被限制在Alunite-Quartz改变区中。在详细的岩体研究的基础上，在紫荆山以硫铜矿 - 脱硫戊二氢盐 - 丝状晶体组合物特征的早期斑岩型矿化阶段被识别，随后通过硫酸盐改变和高硫化Cu-Au矿化阶段强烈地叠印。在沉积物的浅层深度也识别了叠加阶段，黄金大部分富含富含铜，但铜通常浸出。形成与早期绢云母改变和可能斑岩型矿化有关的矿石流体是高温，高盐度岩浆水，其特征在于存在含氮含的夹杂物。 CO 2 H 2 O（C型）夹杂物大多是富含蒸汽的，并在预先骨质改变（ALUNITE改变）中的样品中大量鉴定。它们被视为通过在深度流体沸腾的单相，低于中良盐度岩浆流体的浮能阶段，其中可以预期分离的盐期和相关斑氏矿化。将一组与烯颗粒共存的次级夹杂物在具有alunite改变的样品中被认可，并建议从Cu-Au矿化阶段的矿石形成液中捕获。二次夹杂物的总均化温度和盐度低于300℃（在260-280℃下达到峰值），分别为10wt％NaCl EQV。密集的液体沸腾是在Zijinshan沉积物中形成巨型高硫化Cu（Covelite-，Digenite-Compated）矿物的主要机制。这是根据距离石英谷物中的C型夹杂物的估计深度为1.4-2.1公里的深层高硫酸覆盖物。通过近NW趋势横截面轮廓的流体包裹映射，使用平均总均匀化温度和可能的热源推断等温。结果表明，热源和可能的隐藏式斑纹矿化与紫金山的高硫化Cu-Au矿化术中可能位于紫金山和紫津山和武子宫矿床之间的北部地区，鼓励深钻。

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