新疆觉罗塔格地区东戈壁钼矿床花岗斑岩的成因研究

发布时间：2018-03-07 03:00

本文选题：地质学　切入点：I型花岗岩　出处：《矿床地质》2017年02期 　论文类型：期刊论文

【摘要】：东戈壁钼矿床处于东天山觉罗塔格成矿带的中部,是该地区三叠纪钼成矿带的代表性矿床之一。东戈壁矿床赋存于石炭系干墩组一套浅变质碎屑岩中,隐伏于矿体下部的花岗斑岩为其成矿岩体。文章对东戈壁钼矿床成矿岩体进行了地质特征、岩相学、电子探针和地球化学分析,结果显示东戈壁花岗闪长斑岩的斜长石为中长石-更长石-钠长石系列,钾长石为正长石,黑云母为铁质黑云母。全岩地球化学分析显示东戈壁花岗斑岩为高硅(w(SiO_2)73.36%~74.34%)、高钾(w(K_2O)4.49%~5.61%)、弱过铝质(A/CNK:1.03~1.14)的特点。成因研究显示东戈壁花岗斑岩为I型花岗岩,形成于挤压环境的地壳源区,在上升过程中经历了显著分离结晶形成的高分异岩浆岩。通过对同一时空背景下的东戈壁和白山2个钼成矿岩浆岩开展的矿物学和地球化学等方面的对比研究,表明东戈壁钼矿床花岗斑岩与白山花岗斑岩分别具有地壳源区和地幔源区的特点,是不同岩浆-热事件的产物。
[Abstract]:The East Gobi molybdenum deposit is located in the middle of the eastern Tianshan Jolotag metallogenic belt, and is one of the representative deposits of the Triassic molybdenum metallogenic belt in this area. The East Gobi deposit occurs in a set of shallow metamorphic clastic rocks of the Carboniferous dry Dun formation. The granitic porphyry hidden in the lower part of the orebody is the ore-forming rock mass. The geological characteristics, petrography, electron probe and geochemistry of the ore-forming rock mass of the East Gobi molybdenum deposit are analyzed. The results show that the plagioclase of the granodiorite porphyry in the East Gobi is of the series of meso-feldspar, feldspar and albite, and the potash feldspar is orthoclase. Biotite is iron biotite. The whole rock geochemical analysis shows that the East Gobi granitic porphyry is characterized by high silicon high SiO73.36D 74.34, high potassium WK2O4.495.61G, weak analuminite CNK1.031.14). The genetic study shows that the East Gobi granitic porphyry is I-type granite, formed in the crustal source region of the compressional environment, and is characterized by the formation of the East Gobi granitic porphyry, which is characterized by the formation of the East Gobi granitic porphyry, which is formed in the crustal source region of the compressional environment. In the process of rising, the high grade heteromorphic magmatic rocks were formed through the separation and crystallization. The mineralogy and geochemistry of the two molybdenum ore-forming magmatic rocks in the same time and space background were compared and studied in East Gobi and Baishan. It is shown that granitic porphyry and Baishan granitic porphyry are characterized by crustal source and mantle source respectively and are the product of different magmatic and thermal events.
【作者单位】：合肥工业大学资源与环境工程学院;中国科学院新疆生态与地理研究所新疆矿产资源研究中心;中国地质调查局天津地质调查中心;新疆地质矿产勘查开发局第六地质大队;
【基金】：国家自然科学基金项目(编号:41302050) “十二五”国家科技支撑计划项目(编号:2011BAB06B01) 博士后科学基金第56批面上项目(编号:2014M562488) 中国地质调查局地质调查项目(编号:DD20160039) 中央高校基本科研业务费专项(编号:JZ2016HGTB0730) 中国科学院“西部之光”人才培养引进计划项目新世纪优秀人才支持计划项目(编号:NCET-100324)联合资助
【分类号】：P618.65

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