| 云南兰坪金满中生代沉积岩中的铜矿成矿作用 |
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| 引用本文： | 肖荣阁,陈卉泉.云南兰坪金满中生代沉积岩中的铜矿成矿作用[J].现代地质,1994,8(4):490-496. |
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| 作者姓名： | 肖荣阁 陈卉泉 |
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| 作者单位： | China University of Geosciences，Meijing，100083 |
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| 摘 要： | 兰坪－思茅中新生代盆地沉积岩中产出一系列热液型铜矿床（矿点），以石英、铁白云石与含铜硫化物（包括黄铜矿、斑铜矿、黝铜矿和辉铜矿）为主，呈脉状产于砂岩、页岩中，而单独的黝铜矿、方解石和重晶石脉则产于底部碳酸盐岩中．红色碎屑岩中的浅色还原层内的细脉和裂隙中也具有铜矿化。矿石构造以角砾状、脉状最为发育，矿脉多位于褶皱与走向断裂破碎带的叠加部位。金满铜矿的Ｓｒ、Ｓ、Ｐｈ同位素证据、稀土元素地球化学及液体包裹体资料表明，成矿元素主要来自沉积岩层，合矿卤水属于盆地卤水，流来自于硫酸盐的还原作用及沉积硫化物的淋滤溶解作用。含矿流体是Ｈ。Ｏ－ＮａＣＩ～ＣＯ。体系卤水，成矿温度为１５０～３００Ｃ，流体盐度为５％～２０％ＮａＣＩ。据含ＣＯ２包裹体的测温资料估算成矿压力大于６Ｘ１０＇Ｐａ，相当于３ｋｍ深的静岩压力。根据铜矿床成因研究，笔者提出了含矿热卤水储备与突发成矿作用的成矿模式。成矿前，矿化卤水象石油天然气一样，首先集中到一定的构造部位，在构造活动期突然爆炸成矿。成矿期由３个阶段组成，即爆炸充填、渗透充填与改造阶段，热液活动主要在前两个阶段。
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| 关 键 词： | 沉积岩铜矿，热液型铜矿，成矿作用 |
MINERALIZATION OF JINMAN COPPER DEPOSIT IN MESOZOIC SEDIMENTARY ROCKS IN LANPING, YUNNAN PROVINCE |
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| Xiao Rongge, Chen Huiquan, Shuai Kaiye, Yang Zhongfang.MINERALIZATION OF JINMAN COPPER DEPOSIT IN MESOZOIC SEDIMENTARY ROCKS IN LANPING, YUNNAN PROVINCE[J].Geoscience——Journal of Graduate School,China University of Geosciences,1994,8(4):490-496. |
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| Authors: | Xiao Rongge Chen Huiquan Shuai Kaiye Yang Zhongfang |
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| Abstract: | The epihydrothermal copper deposits occur within red sedimentary rocks of LanpingSimao Mesozoic-Cenozoic basin, Yunnan Province. The assemblage of quartz-ankerite-copper sulfides, including chalcopyrite, bornite and clinoedrite, is prevalent in veins withinsand and shale rocks, whereas cilnoedrite, calcite and barite fill vugs within fundamentalcarbonates. Ore structure are characterized by brecciated and vein structure. Ore veins aresituated in regions of fold associating longitudinal fault breccia zones.Strontium, sulfur and lead isotopes, REE evidence and fluid inclusion data from Jinman copper deposits suggest that ore-forming elements origined from sedimentary rock,copper-bearing fluid from basinal brines and sulfur from reduced sulfate and leached sedimentary sulfides. Ore-bearing fluid with salinities ranging from 5% to 20% NaCl, consistsof H2O-NaCl-CO2 type brine, which homogenized at temperatures between 150℃ and300℃. CO2-bearing fluid inclusions suggest the pressures more than 6 ×107 Pa during mineralization. This pressure corresponds to rock pressure at depths of 3 km. Minerogenesisof the ore-bearing brine deposits and abrupt metallogenesis are suggested. The ore-bearingbrine, being amassed into suitable stuctural regions like oil and natural gas before metallization., explodes abruptly and deposits metallic minerals during mobilization. Mineralization stages consist of distinct phases, explusion filling, infiltration filling and structural reforming phases. The hydrothermal movement was included during the first and secondphases. |
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| Keywords: | copper deposits epihydrothermal copper deposits mineralization |
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