首页|豫西铁炉坪银铅矿床银的赋存状态和富集机制研究

豫西铁炉坪银铅矿床银的赋存状态和富集机制研究

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铁炉坪矿床是豫西重要的大型脉状银多金属矿床之一,为了查明该矿床银的赋存状态和富集机制,开展了矿物学、C-O-S同位素和流体包裹体显微测温研究.结果显示,铁炉坪矿床中银主要以(银)黝铜矿、硫锑铜银矿、辉银矿和自然银等含银矿物产出,少量以次显微包裹体银赋存在硫化物中;碳酸盐矿物的δ13CV-PDB和δ18OSMOW值分别为-3.03‰～-0.61‰和7.93‰～13.73‰,硫化物的δ34S值为-4.49‰～+1.75‰(平均值为-1.53‰),指示铁炉坪矿床成矿流体具有岩浆流体特征.流体包裹体显微测温结果显示,铁炉坪矿床成矿流体具有中低温(113～296℃、中低盐度(2.07％～12.51％)特征.综合研究表明,成矿流体温度、盐度降低以及pH升高是导致铁炉坪矿床矿石矿物沉淀的主要因素.
Occurrence and enrichment mechanism of silver in the Tieluping Ag-Pb deposit in the western Henan,China
The large-scale Tieluping deposit is one of the most important vein-type Ag polymetallic deposits in the western Henan,China.In this paper,we have carried out studies of mineralogy,C-O-S isotopes and fluid inclusion microthermometric measurement to reveal the occurrence and enrichment mechanism of silver in this deposit.The results show that silver mainly occurred in the form of independent silver minerals including argentiferous tetrahedrite,polybasite,argentite,and native silver,with a small amount of invisible silver presented as sub-micron inclusions in sulfides.The δ13CV-PDB and δ18OSMOW values of various carbonates range from-3.03‰to-0.61‰and from 7.93‰to 13.73‰,respectively.Theδ34S values of sulfides rang from-4.49‰to+1.75‰,with a mean value of-1.53‰.These C-O-S isotopes indicate that the ore-forming fluid of the Tieluping deposit has the characteristics of magmatic hydrothermal fluid.Microthermometric data of fluid inclusions reveal that the ore-forming fluid was characterized with medium-low temperatures(113～296℃)and medium-low salinities(2.07％～12.51％).Comprehensive studies suggest that the decrease of temperatures and salinities and the increase of pH values of the ore-forming fluid were main factors that triggered the precipitation of ore minerals in the Tieluping deposit.

occurrence of Agenrichment mechanismvein-type Ag polymetallic depositTielupingwestern Henan

徐进鸿、吴承泉、张正伟、姜玉平、胡书礼、郑超飞、李溪遥、靳子茹

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铜仁学院 旅游地理系,贵州 铜仁 554300

中国科学院 地球化学研究所,矿床地球化学国家重点实验室,贵阳 550081

中国科学院大学,北京 100049

河南省豫地科技集团有限公司,郑州 450053

五邑大学 企业(行业)联盟联络服务中心,广东 江门 529000

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银的赋存状态 富集机制 脉状Ag多金属矿床 铁炉坪 豫西

铜仁学院博士科研启动基金贵州省教育厅高等学校科研项目青年项目铜仁市科技计划NSFG-新疆联合基金国家自然科学基金

trxyDH2016黔教技[2022]349号铜市科研[2022]64号U160324541703051

2024

10.19658/j.issn.1007-2802.2023.42.049

矿物岩石地球化学通报
中国矿物岩石地球化学学会 中国科学院地球化学研究所

矿物岩石地球化学通报

CSTPCD北大核心
影响因子：0.912
ISSN：1007-2802
年,卷(期)：2024.43(2)
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