兰坪盆地科登涧脉状铜矿床地质、地球化学特征
Geology and geochemistry of the Kedengjian vein-type copper deposit in western Lanping basin
查看参考文献34篇
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文摘
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兰坪盆地西缘发育一系列脉状铜矿床,科登涧铜矿床是其组成之一。该矿床矿体主要产出于上三叠统崔依比组(T_(3C))中基性火山岩内部的断层破碎带中。热液期成矿作用可大致划分为2个成矿阶段:主成矿阶段主要发育大量含铜硫化物石英脉,晚成矿阶段主要发育贫硫化物方解石脉。流体包裹体结果表明,主成矿期石英和成矿后期石英/方解石中均主要发育两相水溶液包裹体,含CO_2包裹体极少出现。主成矿期石英脉中包裹体均一温度变化幅度较小,集中在180~240℃,盐度(NaCl_(eq),质量分数)集中在8%~14%。成矿流体主要表现出盆地热卤水的特征,这与兰坪盆地内其它Pb、Zn、Cu等贱金属矿床的成矿流体特征较为一致。成矿流体的δ~(18)O值为3.5‰~5.5‰,δD值为-62‰~ -38‰,介于岩浆水/变质水和大气降水之间。热液硫化物黄铜矿、黄铁矿、斑铜矿的δ~(34)S值显示较低的负值(-20.8‰~-9.4‰),明显有别于赋矿围岩(安山岩)的δ~(34)S值(11.1‰~11.6‰),推测该矿床成矿所需还原硫主要来自于地层硫酸盐。综合分析认为,该矿床成矿物质主要来源于地层,成矿流体主要为源于大气降水或建造水的盆地热卤水。 |
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其他语种文摘
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A series of sediments-hosted vein-tpye copper deposits have been discovered in the western part of the basin. The Kedengjian vein-type copper deposit is one of these deposits in Lanping basin. The Cu mineralization mainly occurs as sulfide-bearing quartz-carbonate veins in faults and fractures, hosted by volcanic rocks of Triassic Cuiyibi Formation (T_(3C)). Ore-forming process of the Kedengjian copper deposit can be divided into two stages: the major stage (massive polymetallic sulfide quartz vein stage), and the late stage (carbonate-quartz stage). A detailed study of fluid inclusions led to the recognition of two types of fluid inclusions, i.e., aqueous water, and CO_2-H_2O inclusions, with the aqueous water inclusions being dominant. Total homogenization temperatures range from 180℃ to 240℃,with corresponding salinities from 8% to 14% NaCl equivalent. These characteristics of fluid inclusions in the Kedengjian copper deposit are comparable with those of basinal mineralization systems, which formed most Pb-Zn deposits in the Lanping basin. The H, O isotope studies of inclusions in quartz suggest that the ore-bearing fluid was derived from atmospheric water. The δ~(34)S of sulfide minerals are widely variable between - 20.8‰ and - 9.4‰, indicating that the sulfur was derived from the sedimentary rocks of the basin. Comprehensive studies indicate that the ore-forming materials originated mainly from sedimentary rocks, and the ore-forming fluids were mainly composed of basinal brines, derived from formation water in strata and meteoric water. |
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来源
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岩石矿物学杂志
,2016,35(4):692-702 【核心库】
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关键词
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地质特征
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地球化学
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科登涧脉状铜矿床
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兰坪盆地
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地址
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中国地质调查局成都地质调查中心, 四川, 成都, 610081
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中国科学院地球化学研究所, 贵州, 贵阳, 550002
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成都理工大学地球科学学院, 四川, 成都, 610059
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-6524 |
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学科
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地质学 |
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基金
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国家自然科学基金国家杰出青年科学基金
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国土资源部中国地质调查局项目
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文献收藏号
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CSCD:5756621
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