滇西北雪鸡坪斑岩铜矿流体包裹体初步研究
Study of fluid inclusions in quartz veinlets in the Xuejiping porphyry copper deposit, Northwest Yunnan, China
查看参考文献77篇
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文摘
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雪鸡坪中型斑岩铜矿床位于三江地区义敦岛弧南端的中甸弧,成矿斑岩为石英闪长玢岩和石英二长斑岩,属于印支期产物.含矿岩体蚀变分带明显,由中心向外发育强硅化带→石英绢云母化带→粘土化-石英绢云母化带→青磐岩化带,工业矿体赋存于斑岩体中心强硅化和石英绢云母化带内.矿化类型以网脉状矿化为主,细脉浸染状矿化不发育.本文对主要矿化阶段石英脉中的流体包裹体系统进行了包裹体岩相学、显微测温学和激光拉曼谱学研究,发现与成矿有关的流体包裹体可以分为水溶液包裹体、CO2包裹体和含子矿物包裹体3类,子矿物主要为石盐、方解石、赤铁矿和少量CaCl2水合物及不透明硫化物.其中含子矿物包裹体均一温度为230～420℃,盐度为33.48%～75.40%NaClequiv.,密度为1.01～1.09g/cm3.激光拉曼光谱分析表明,包裹体的液相成分主要为H2O,气相成分为H2O和CO2.早期水溶液包裹体和CO2包裹体共生,其均一温度相近,以及纯CO2包裹体的发现,指示成矿流体存在不混溶现象,这种不混溶是由原始岩浆流体"二次沸腾"作用产生的.CO2相分离、温压条件降低和pH值升高是雪鸡坪斑岩铜矿硫化物沉淀的主要原因.晚期低温、低盐度的流体可能来源于大气降水与岩浆流体的混和,对矿化的意义不大. |
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来源
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岩石学报
,2008,24(9):2017-2028 【核心库】
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关键词
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流体包裹体
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雪鸡坪斑岩铜矿
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中句
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滇西北
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地址
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1.
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, 贵州, 贵阳
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云南省地质调查院矿产调查所, 云南, 大理
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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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1000-0569 |
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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
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国家973计划
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文献收藏号
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CSCD:3499995
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