内蒙古红彦镇地区山神府花岗岩熔融-流体包裹体特征及其成矿意义

发布时间：2018-06-02 04:13

本文选题：山神府花岗岩 + 熔-流包裹体　；参考：《地球科学》2016年01期

【摘要】：通过内蒙古红彦镇地区山神府花岗岩的包裹体研究来探讨岩浆-热液过渡阶段的流体特征和成矿潜力.研究表明,山神府花岗岩包裹体类型可分为熔融包裹体、熔-流包裹体和流体包裹体3大类.熔-流包裹体的存在表明花岗岩经历岩浆-热液过渡阶段,而岩体中心相-边缘相流体包裹体均一温度从281℃变化到大于550℃,盐度从1.1%NaCl eqv变化到大于66.8%NaCl eqv同样指示了这一特征.根据不同温度、盐度包裹体等容线和水饱和花岗质岩浆固相线相交法可计算岩浆出溶流体温压范围,结合CO_2三相包裹体对岩体最小侵位压力有较好限制,估算出山神府花岗岩最小侵位深度为7.6~9.5km,出溶温度为580~700℃,出溶深度集中在6.0~14.9km.包裹体拉曼特征表明,熔-流包裹体固相成分含有重晶石、蓝铜矿和赤铁矿等强氧化性物质,说明岩浆-热液体系具有高氧逸度,而在高温高压高盐条件下非常有利于岩浆中Cu等金属向出溶流体中富集,结合野外矿化蚀变特征,分析得出山神府地区具有较好寻找岩浆热液型Cu矿床的成矿潜力.
[Abstract]:Through the study of the inclusions in the granite in the Hongyan Town, Inner Mongolia, the fluid characteristics and metallogenic potential of the magma hydrothermal transition phase are discussed. The study shows that the types of granite inclusions in the mountain Shen Fu can be divided into 3 types: melt inclusions, melt fluid inclusions and fluid inclusions. The existence of molten fluid inclusions shows that granite is experienced magma - The homogenization temperature of the fluid inclusions in the central phase and marginal phase of the rock mass varies from 281 to 550, and the salinity varies from 1.1%NaCl EQV to greater than 66.8%NaCl EQV. The minimum emplacement pressure of rock mass is limited by the CO_2 three phase inclusions. It is estimated that the minimum emplacement depth is 7.6~9.5km, the dissolution temperature is 580~700 C, the dissolution depth is concentrated on the Raman characteristics of the 6.0~14.9km. inclusions, and the solid phase composition of the melt fluid inclusions contains barite, blue copper mine and hematite and other strong oxygen. It shows that the magma thermal fluid system has high oxygen fugacity, and it is very beneficial to the enrichment of Cu and other metals in magma under high temperature, high pressure and high salt conditions. In combination with the characteristics of mineralized alteration in the field, the metallogenic potential of the magmatic hydrothermal type Cu deposit is obtained.
【作者单位】：中国地质大学资源学院;中国地质大学地质过程与矿产资源国家重点实验室;
【基金】：中国地质调查局地质调查项目(No.NMKD2010-3)
【分类号】：P588.121;P611

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