东昆仑东段哈陇休玛斑岩型钼矿成矿流体特征及成矿机制探讨

发布时间：2018-03-07 03:29

  本文选题：东昆仑东段　切入点：哈陇休玛矿床　出处：《矿物岩石》2017年03期 　论文类型：期刊论文

【摘要】：哈陇休玛钼矿位于东昆仑造山带东段,是近年来新发现的斑岩型钼矿床,规模已达中型。与成矿有关的岩体是晚三叠世花岗闪长斑岩流体包裹体的研究表明,石英-辉钼矿阶段流体包裹体类型主要有气液两相和含CO_2三相包裹体两种类型,前者盐水溶液盐度集中在6NaCI.eqv~12 NaCI.eqv间,后者盐度较大主要集中在16%NaCI.eqv~20%NaCI.eqv,该阶段包裹体均一温度集中于260℃~360℃;石英-多金属硫化物阶段流体包裹体主要以气液两相为主,包裹体均一温度集中于200℃~260℃,盐度集中在6%NaCI.eqv~10%NaCI.eqv。成矿流体由中高温、中-低盐度、富CO_2的流体向中低温、低盐度、低CO_2流体演化。沸腾流体包裹体组合的存在暗示了成矿流体的沸腾作用,可能由于压力急剧降低而形成。通过等容线相交法获得沸腾包裹体组合捕获时的压力为84MPa~120 MPa之间,成矿深度估算为3.2km~4.5km。总体上,成矿流体由中高温、中-低盐度、富CO_2的流体向中低温、低盐度、低CO_2流体演化。该矿床形成于东昆仑造山带印支晚期后碰撞环境,成矿花岗闪长斑岩体主要源自下地壳的部分熔融,金属Mo主要来源于下地壳底部,部分萃取于上部地壳,成矿流体中含CO_2组分是大陆环境含Mo岩浆系统的普遍特征。
[Abstract]:The Halong Xiuma molybdenum deposit is located in the eastern section of the East Kunlun orogenic belt. It is a newly discovered porphyry type molybdenum deposit in recent years and has a medium scale. The study of fluid inclusions of granodiorite porphyry related to ore-forming shows that the ore-forming rock mass is of late Triassic granodiorite fluid inclusions. The types of fluid inclusions in quartz-molybdenum stage are mainly gas-liquid two-phase and three-phase inclusions containing CO_2. The salinity of the former brine solution is concentrated in the range of 6NaCI.eqvn 12 NaCI.eqv. The latter is mainly concentrated in 16NaCI.eqvn20NaCI.eqv.The homogenization temperature of inclusions at this stage is 260 鈩，

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