青海省果洛龙洼金矿多因复成成矿作用

发布时间：2017-12-28 02:25

本文关键词：青海省果洛龙洼金矿多因复成成矿作用　出处：《中国有色金属学报》2016年02期 　论文类型：期刊论文

【摘要】：果洛龙洼金矿位于东昆仑造山带东段,华力西.印支期是最重要的成矿期。矿体受近东西向断裂控制,地-层为矿源层和隔挡层,对矿质进行圈闭,变质热液及岩浆提供热源和物质。成矿作用分为变质热液期和岩浆热液期,前者包括乳白色石英脉阶段(A)和含金石英黄铁矿阶段(B),为主成矿期,后者对应石英硫化物再富集阶段(C),起叠加改造作用。综合稳定同位素及包裹体的特征,从多因复成的角度探讨其成矿作用。稳定同位素反映成矿物质及流体为多来源。包裹体研究表明:B、C阶段发育3种包裹体:Ⅰ型水溶液包裹体、Ⅱ型水溶液-CO_2包裹体、Ⅲ型纯CO_2包裹体。B阶段发育的3种包裹体温度集中于260~360℃,Ⅰ型、Ⅱ型包裹体盐度分别为10.70%~22.69%和3.52%~12.42%,流体可能来源于变质热液,属变质热液期。C阶段发育Ⅰ型包裹体及少量Ⅱ型包裹体,温度集中于160~320℃,Ⅰ型、Ⅱ型包裹体盐度分别为15.90%~23.32%和10.62%~13.57%,成矿热液可能主要来源于岩浆热液,为岩浆热液期。矿床在变质热液期成矿,后期受到岩浆热液叠加改造,矿质进行再富集。因此,矿床具多大地构造阶段、多控矿因素、多成矿物质来源、多成矿作用及多成因类型,属多因复成矿床。
[Abstract]:The GUOLUOLONGWA gold deposit is located in the eastern section of the East Kunlun orogenic belt. The Variscan Indosinian metallogenic period is the most important. The ore body is controlled by the near East-West fracture, the ground layer is the ore source layer and the barrier layer, and the mineral is trapped, the metamorphic hydrothermal fluid and the magma provide the heat source and the material. The mineralization is divided into metamorphic hydrothermal period and magmatic hydrothermal stage. The former includes the stage of A and B, which is the main metallogenic epoch, and the latter corresponds to the quartz sulfide reenrichment stage (C), which is superimposed and reformed. Based on the characteristics of stable isotopes and inclusions, the mineralization is discussed from the point of view of multiple causes. Stable isotopes reflect the multiple sources of minerals and fluids. The inclusions study showed that 3 kinds of inclusions developed in the B and C stages: type I aqueous solution inclusions, -CO_2 inclusions in type II aqueous solution and type III pure CO_2 inclusions. The temperature of the 3 inclusions in the B stage is concentrated at 260~360 C. The salinity of type I and type II inclusions is 10.70%~22.69% and 3.52%~12.42% respectively. The fluid probably comes from the metamorphic hydrothermal solution and belongs to the metamorphic hydrothermal period. In the C stage, type I inclusions and a small number of type II inclusions are developed. The temperature is concentrated at 160~320 C. The salinity of type I and type II inclusions is 15.90%~23.32% and 10.62%~13.57% respectively. The ore forming hydrothermal fluid may be the main source of Yu Yanjiang hydrothermal solution, which is the magmatic hydrothermal stage. The deposit is formed in the metamorphic hydrothermal period, and the later is reformed by the superposition of the magmatic hydrothermal solution, and the mineral is reenriched. Therefore, the deposit has multiple tectonic stages, multiple ore controlling factors, multiple mineral sources, multiple mineralization and multiple genetic types, which belong to the multi cause complex deposit.
【作者单位】：中南大学有色金属成矿预测与地质环境监测教育部重点实验室;中南大学地球科学与信息物理学院;
【基金】：中南大学“创新驱动项目”(2015CX008) 国家“十一五”科技支撑计划(2006BAA01B06)~~
【分类号】：P618.51
【正文快照】： 东昆仑造山带位于青藏高原东北缘,在构造上具出十分可靠的地质依据,亦未对成矿流体特征作深入有多岛洋、软碰撞和多旋回造山的特征[1],是我国著探讨。本文作者通过综合稳定同位素及流体包裹体特名的成矿带之一,素有“金腰带”之称。果洛龙洼金征,从多因复成的角度对果洛龙洼金

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