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The age of granitic intrusion from Dongliushuquanzi in Urad Zhongqi, Inner Mongolia and its tectonic implications
Geological Journal ( IF 1.8 ) Pub Date : 2020-11-23 , DOI: 10.1002/gj.4039
Xingchen Yang 1, 2 , Fengbao Ji 3 , Peisheng Ye 1, 2 , Jinbao Yang 4 , Maotang Cai 1, 2 , Yuchun Guan 5
Affiliation  

The Dongliushuquanzi magmatism contains two units: granitic intrusion and multiple intrusive dioritic veins. LA‐ICP‐MS zircon dating results have revealed that the magmatism developed in two distinct episodes: the first episode, which occurred in the Late Carboniferous–Early Permian, is characterized by the main granitic intrusion and the Phase I dioritic veins, Phase II dioritic veins developed during the second magmatic episode in the late Early Permian. The analysing results of major and trace elements indicate that the granitic intrusion are enriched in light rare earth elements and large‐ion lithophile elements such as Rb, Ba, K, but depleted in high‐field‐strength elements, such as Nb, Ta, P, and Ti. These geochemical signatures, in addition to their weak negative Eu anomalies, are similar to those of continental arc magmatic rocks. The main body of the granitic intrusion and the Phase I dioritic veins are characterized by negative and inhomogeneous ε Hf (t) values (include ε Hf (t) < −10 and −10 < ε Hf (t) < −5 two subgroups), they were derived from mixture of decompression melting basaltic juvenile lower crustal materials and partial melting ancient materials in middle‐upper crust. Phase II dioritic veins are characterized by positive and homogeneous zircon εHf(t) values (~ + 10), record predominantly juvenile crustal sources, formed by partial melting of basaltic juvenile lower crustal materials. The two magmatic episodes are in response to slab rollback, slab break‐off and final amalgamation of the Palaeo‐Asian Ocean. The ages of inherited zircons record ~499 and ~365 Ma magmatic activity, imply that there also exist Cambrian and Devonian magmatism in the west section of the northern margin of the North China Craton.

中文翻译:

内蒙古乌拉特中旗东柳树泉子花岗岩侵入时代及其构造意义

东柳树泉子岩浆包含两个单元:花岗质侵入岩和多个侵入性闪长岩脉。LA‐ICP‐MS锆石测年结果表明,岩浆作用有两个不同的时期发生:第一个时期发生在石炭纪-早二叠世晚期,其特征是主要的花岗岩侵入和I期闪闪生脉,II期闪闪生辉在早二叠世的第二岩浆事件中形成了静脉。主要元素和痕量元素的分析结果表明,花岗岩侵入体富含轻稀土元素和大离子嗜石元素,例如Rb,Ba,K,但缺乏高场强元素,例如Nb,Ta, P和Ti。这些地球化学特征,除了其较弱的负Eu异常外,还与大陆弧岩浆岩相似。Hf(t)值(包括εHf(t)<-10和-10 < εHf(t)<-5两个子组),它们来自减压熔融玄武质下地壳下部物质和部分熔融古物质的混合物。中上地壳。相II闪长脉的特征在于正极和均匀锆ε(t)值(〜+ 10),主要记录了由玄武质下地壳物质的部分融化形成的幼年地壳来源。这两个岩浆事件是对板块回滚,板块折断和古亚洲洋最终合并的反应。继承的锆石的年龄记录了约499和〜365 Ma的岩浆活动,这表明在华北克拉通北缘的西部也存在寒武纪和泥盆纪的岩浆活动。
更新日期:2020-11-23
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