西藏仲巴县玛浪勒铜矿床地质特征及流体包裹体研究

发布时间：2018-05-29 17:33

  本文选题：流体包裹体 + 火山热液矿床　； 参考：《地质科技情报》2017年05期

【摘要】：玛浪勒铜矿床位于西藏仲巴县隆格尔乡,大地构造位置属于措勤-申扎火山岩浆弧。矿体呈脉状产于灰岩与则弄群安山岩及安山质晶屑凝灰岩的接触带及其附近。基于矿床野外地质特征、室内岩矿鉴定以及流体包裹体显微测温的研究表明:玛浪勒铜矿床至少存在2个阶段的成矿作用,即方解石-硫化物阶段和后期地下水热液叠加改造阶段。石英和方解石主要发育富液相的气液两相包裹体,其中,方解石-硫化物成矿阶段的包裹体均一温度为177~271℃,盐度w(NaCl_(eqv))为5.26%~20.37%;地下水热液叠加改造阶段的均一温度为118~170℃,盐度w(NaCl_(eqv))为1.91%~16.15%。成矿流体密度为0.90~1.07g/cm~3,估算成矿压力为9.16~26.84 MPa,对应的成矿深度为0.92~2.68km。基于赋矿安山岩富集大离子亲石元素、亏损高场强元素的地球化学特征分析表明,该矿床形成于班公湖-怒江特提斯洋南向俯冲的构造背景下,为与火山期后热液相关的浅成低温热液矿床。区域该类型矿产勘查最新进展的综合分析表明,在措勤-申扎火山岩浆弧上寻找与火山期后热液相关铜矿床的潜力较大。
[Abstract]:The Malanle copper deposit is located in Longer Township, Zhongba County, Tibet. The tectonic location belongs to the Cuoqin-Shenza volcanic magmatic arc. The orebody occurs in the contact zone between limestone and Zelong group andesite and Anshan crystalline tuff. Based on the field geological characteristics of the deposit, the identification of indoor rock deposits and the microthermometry of fluid inclusions, it is shown that there are at least two stages of mineralization in the Malanle copper deposit. That is calcite-sulphide stage and late stage of groundwater hydrothermal superposition transformation stage. Quartz and calcite mainly develop liquid-rich gas-liquid two-phase inclusions, in which the homogenization temperature of inclusions in calcite and sulphide metallogeny stage is 177 鈩，

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