| 陈志方,毕文军,王昊,李杰,张德会,刘宁强,白阳,谢晋强,马坤元,田毓仁,王超.山西右玉火烧滩金矿床流体包裹体特征研究及矿床成因浅析[J].矿产勘查,2025,16(7):1663-1675 |
| 山西右玉火烧滩金矿床流体包裹体特征研究及矿床成因浅析 |
| Fluid inclusion characteristics and genesis of Huoshaotan gold deposit at Youyu, Shanxi Province |
| 投稿时间：2024-05-11 |
| DOI：10.20008/j.kckc.202507009 |
| 中文关键词: 火烧滩金矿床 流体包裹体 金的迁移与沉淀 |
| 英文关键词: Huoshaotan gold deposit fluid inclusions gold migration and precipitation |
| 基金项目:本文受山西省基础研究计划(202103021223120；202303021212041)、山西省地质勘查基金项目“山西省右玉县后窑子—火烧滩金矿外围普查”(2018-3)联合资助。 |
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| 中文摘要: |
| 山西右玉火烧滩金矿床位于乌拉山—大青山矿集区东南部，了解其成矿流体特征以及金的迁移和沉积过程不仅有助于在该地区开展下一步的找矿工作，同时可为研究同类型矿床提供理论指导意义。为了解决上述问题，本文开展矿床地质特征以及石英流体包裹体的温度、压力、盐度和密度的研究。野外地质调查和工程勘查结果显示研究区矿体空间产出状态与韧性剪切带一致，矿石类型为构造蚀变岩型。流体包裹体特征显示包裹体以气液包裹体和气体包裹体为主，少量为气液固流体包裹体；成矿流体总体具有中—高温(160~400 ℃)、低盐度(0~10%)、低密度(0.741~1.107 g/cm3)的特点。此外，该矿床成矿压力均值为 |
| 英文摘要: |
| The Huoshaotan gold deposit in Youyu County of Shanxi Province is located in the southeast of theWulashan-Daqingshan gold district. The characteristics of ore-forming fluids and the gold migration and precipita-tion mechanisms not only play an important role in carrying out the next step of mineral exploration in the region,but also provide the theoretical guidance for studying the similar mineral deposits. To address the above-mentionedissues, we conduct the studies of the geological characteristics of mineral deposits and the temperature, pressure, sa-linity, and density of fluid inclusions in quartz. The results of the field geological investigation and the engineeringexploration show that the attitude of the ore bodies is consistent with the ductile shear zone in the study area, andthe ore type belongs to the structural altered rock type. The characteristics of fluid inclusions in quartz indicate thatthe inclusions consist of the gas-liquid inclusions and gas inclusions with a few gas-liquid-solid fluid inclusions.The ore-forming fluids are mainly characterized by the medium-high temperature (160-400 ℃ ), low salinity (0-10%), and low density (0.741-1.107 g/cm3). In addition, the average pressure and depth of mineralization are lim-ited to 46.2 MPa and 3.66 km, respectively. Integrated with our results and previous studies, we deem that the mi-gration and precipitation of gold is related to the numerous factors, such as the hydrothermal channels provided bythe ductile shear zones (brittle structure), the total sulfur concentration decrease, the reduction of temperature andpressure, the increase of oxygen fugacity, the fluid-rock reactions, the fluid immiscibility. The formation of theHuoshaotan gold deposit is related to the Triassic regional brittle extension and the activities of the ore-formingfluid along the ductile shear zone. |
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