新疆阿尔泰造山带乌希里克地区奥陶纪岩浆活动及其地质意义

发布时间：2018-03-13 16:07

本文选题：花岗岩　切入点：U-Pb年龄　出处：《岩石学报》2017年08期 　论文类型：期刊论文

【摘要】：阿尔泰乌希里克地区位于阿尔泰造山带的核心部位,本文首次报导该地区出露的早古生代奥陶纪花岗质侵入岩和火山岩。年代学结果表明该地区原来划为中-上奥陶统哈巴河群中的英安岩时代为486±7Ma,斜长角闪岩的原岩时代为482±5Ma,属早奥陶世,而侵位于这套地层中的阿斯恰套岩体、杜洛埃岩体和哈拉尔次岩体的结晶年龄分别为461±2Ma、452±5Ma、455±3Ma,属中-晚奥陶世。这些岩体和围岩的时空关系表明乌希里克地区哈巴河群应属下奥陶统。现有资料表明哈巴河群时间跨度很大,应该通过详细工作将其解体。这些侵入岩和喷出岩均属钙碱性到高钾钙碱性系列,准铝质到过铝质,具有相似的右倾稀土配分模式,亏损高场强元素Nb、Ta、Zr、Hf,富集大离子亲石元素K、Rb、Ba等,具弧岩浆岩的地球化学特征。哈拉尔次岩体和英安岩富K贫Na,尔齐斯-斋桑洋向北俯冲作用的产物。
[Abstract]:The Altaiuhirik region is located at the heart of the Altai orogenic belt. The early Paleozoic Ordovician granitic intrusive rocks and volcanic rocks are first reported in this area. The geochronological results show that the area was originally classified as the dolomite age of 486 卤7 Main in the middle and upper Ordovician Habahe group, and the proto-amphibolite of the amphibolite. The rock age is 482 卤5 Ma. it belongs to early Ordovician. And transgression of the Ascatsuthian rock body, which is located in this set of strata, The crystallization age of the Drouet and Harald subbodies is 461 卤2Ma-452 卤5Ma-455 卤3Marespectively, belonging to the Middle-Late Ordovician. The temporal and spatial relationships between these bodies and the surrounding rocks indicate that the Habahe Group in the Uxirik area belongs to the Ordovician. The available data show that the Habahe Group has a long time span. It should be disintegrated through detailed work. These intrusive and exhaled rocks are of a calc-alkaline to high-potassium calc-alkaline series, quasi-aluminous to peraluminous, with a similar right-dip rare-earth distribution pattern, The depleted high field strength element NbLi Tahszr Hf, enriched in the large ion lithophile element Knr Rbnb Ba and so on, has the geochemical characteristics of arc magma. The Harald secondary body and the dolomite are rich in K, Na, Erchis-Zhai and Sangyang subduction to the north.
【作者单位】：中国地质大学地球科学与资源学院;中国人民武装警察部队黄金第八支队;中国地质调查局成都地质调查中心;
【基金】：中国地质调查局地质调查项目(12120113071900)资助
【分类号】：P534.42;P588.1

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