东昆仑它温查汉西花岗岩地质地球化学特征及其构造意义

发布时间：2018-02-27 20:14

本文关键词： 矽卡岩 Ⅰ型和A型花岗岩碰撞-后碰撞转化阶段壳-幔岩浆混合它温查汉西铁多金属矿床东昆仑　出处：《高校地质学报》2017年03期 　论文类型：期刊论文

【摘要】：它温查汉西铁多金属矿床是东昆仑祁漫塔格成矿带新发现的又一典型矽卡岩型矿床,与成矿密切相关的花岗闪长斑岩和二长花岗斑岩成岩时代分别为236.0±2.3 Ma和229.9±2.0 Ma。二者均为弱过铝质高钾钙碱性系列,成因类型分别属于Ⅰ型和A型;二者稀土元素配分表现为富LREE、贫HREE以及中等Eu负异常的特征,微量元素具有Th、U、K、Zr、Hf相对富集和Nb、Ta、Ti、Sr、Ba相对亏损的特征。花岗闪长斑岩和二长花岗斑岩形成于晚古生代—早中生代构造—岩浆旋回的碰撞—后碰撞转化阶段,与区域上的大规模幔源岩浆底侵及壳—幔岩浆混合作用有关,从形成花岗闪长斑岩到二长花岗斑岩过程中地壳具有由厚减薄的趋势。
[Abstract]:It is another typical skarn type deposit newly discovered in Qimantage metallogenic belt of East Kunlun. The diagenetic ages of granodiorite and Erchang granodiorite are 236.0 卤2.3 Ma and 229.9 卤2.0 Ma, respectively. The REE partitioning of the two elements is characterized by rich LREE, poor HREE and moderate negative EU anomalies. The trace elements are characterized by the relative enrichment of Th _ (U) K _ (K) Zr _ (Zr) H _ f and the relative depletion of NB _ (T) _ T _ (Ti) ~ (Sr) Ba. Granodiorite porphyry and Erchang granitic porphyry were formed in the late Paleozoic to early Mesozoic tectonic-magmatic cycle during the collisional and post-collisional transformation stage. The crustal thickness decreases from granodiorite porphyry to Erchang granodiorite porphyry in the process of large scale mantle magma underplating and crust mantle magma mixing in the region, and the crustal thickness tends to be thinned during the formation of granodiorite porphyry to Erchang granodiorite porphyry.
【作者单位】：中国地质调查局西安地质调查中心;长安大学地球科学与资源学院;
【基金】：中国地质调查局青海省岩浆岩时空分布与成矿作用研究项目(1212011121089) 青海省都兰县察汗乌苏河地区1∶5万地质矿产综合调查子项目(12120115022101)
【分类号】：P588.121;P612

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