| 陈国忠,李康宁,李注苍.夏河—合作矿集区印支期TTG岩石组合、构造意义及其与金成矿关系[J].矿产勘查,2019,(6):1425-1434 |
| 夏河—合作矿集区印支期TTG岩石组合、构造意义及其与金成矿关系 |
| TTG rock assemblage, tectonic significance and its relation with gold mineralization in the indosinian period of XiaHe-Hezuo ore-gathering area |
| 投稿时间：2019-01-10 |
| DOI： |
| 中文关键词: 夏河-合作矿集区 TTG岩石组合 构造意义 成矿关系 |
| 英文关键词: XiaHe-Hezuo ore concentration area, TTG rocks assemblage, tectonic significance, metallogenic relationship |
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| 中文摘要: |
| 西秦岭造山带岩浆活动发育,成矿作用密集,是近年来研究的热点地区。夏河—合作矿集区是西秦岭地区重要的矿集区之一,区内目前已发现早子沟、加甘滩两个特大型金矿及多处中小型金矿床(点),目前对区内的研究主要集中于构造演化、成岩成矿时代等方面,取得一些成果,但对区内的构造环境存在诸多争议,本文通过分析矿集区内侵入岩时空分布、岩石学特征及其TTG岩石组合,讨论了矿集区TTG岩石组合的岩石成因及构造性质,进而分析了其与矿集区内金成矿的关系。根据矿集区内花岗岩类岩石的岩石学、地球化学特征分析与投图研究,矿集区内岩浆岩岩性主要为闪长岩一花岗闪长岩一石英二长岩一黑云母花岗岩,多属于I型花岗岩,具大陆边缘弧花岗岩(CAG)的特征。岩浆主要来源于玄武质洋壳的脱水熔融,为洋壳基性岩浆和大陆上地幔岩浆的混合物。结合区域地质特征分析,该TTG岩石组合与其西延出露的高镁安山岩构成组成极性,表明西秦岭造山带是由一系列微板块与许多小洋盆组成的具有多幕俯冲的多岛洋盆。在石炭纪—三叠纪经历了洋壳俯冲、板片断离及陆陆碰撞的演化过程,在此期间岩浆活动为金矿成矿提供了热液,促使地层中早期汇聚的含金物质再富集,在热动力驱动下沿有利构造方向运移,并不断萃取周围岩层中的金,在构造有利部位富集成矿。 |
| 英文摘要: |
| West Qinling orogenic belt magmatic activity development, mineralization concentration, is the research hotspots in recent years, XiaHe -Hezuo ore concentration area is one of the important ore concentration area in West Qinling mountain area, the area has been found that early child ditch, gump beach two super large gold deposits and several small and medium-sized gold deposits (points), at present the study of area mainly concentrated in tectonic evolution, diagenesis metallogenic epoch, etc., made some achievements, but for the area of the tectonic environment, the argument in this article, through analysis of mineralization intrusive rocks in space and time distribution, petrology characteristics and TTG rocks combination, Ore concentration area is discussed TTG rocks combination of rock formation and then analysis the structure properties and its relation with mineralization zone of gold mineralization, according to the mineralization zone of granite rock lithology, geochemical analysis and figure study, magmatite lithology mainly diorite mineralization zone a granodiorite quartz monzonite biotite granite, belongs to the type I granite, with the characteristics of the continental margin arc granite (CAG). The magma mainly comes from the dehydration and melting of the basaltic oceanic crust, which is a mixture of the oceanic basement magma and the continental upper mantle magma. Analysis in combination with regional geological features, the TTG rocks combination and its west extension of magnesia andesite formation exposed polarity, shows that the west qinling orogenic belt is composed of a series of micro plate with many little basin has a multi-stage subduction island ocean basin, oceanic crust subduction in the carboniferous, Triassic manager, fragments of plate and the evolution process of the Liu Liu collision, magmatic activity in this period offers gold metallogenic hydrothermal and prompted the formation of early convergence of gold material enrichment, along the direction favorable structure under dynamic drive migration, surrounding rock in gold, and extraction in the advantage position for mineralization. |
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