青海省那陵郭勒河中游晚三叠世侵入岩地球化学特征及地质意义

吉明甲; 魏丽琼; 徐博; 刘博; 白洪溪; 陈晓琳; 李兄

doi:10.19751/j.cnki.61-1149/p.2021.01.004

青海省那陵郭勒河中游晚三叠世侵入岩地球化学特征及地质意义

1. 青海省地质调查局, 青海西宁 810001;
2. 中国地质大学(北京), 北京 100083

基金项目:

青海省地勘基金项目“青海省格尔木市浑德伦地区J46E021011、J46E021012两幅1∶5万区域地质矿产调查”（青国土资矿[2011]404号）

详细信息

作者简介:
吉明甲(1990-),男,地质矿产工程师,主要从事地质勘查管理及地质资料管理工作。E-mail:jimingjiahyj@163.com

中图分类号: P595
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出版历程
- 收稿日期: 2020-04-13
- 修回日期: 2020-11-03
- 网络出版日期: 2022-07-28
- 发布日期: 2021-03-04

Geochemical Characteristics and Geological Significance of Late Triassic Intrusive Rocks in the Middle Reaches of Naling Guole River, Qinghai Province

1. Qinghai Geological Survey Bureau, Xining 810001, Qinghai, China;
2. China University of Geosciences(Beijing), Beijing 100083, China

摘要

摘要: 那陵郭勒河中游位于东昆仑西段祁漫塔格地区，分布着大量的花岗岩。对该地区晚三叠世侵入岩的研究有助于认识东昆仑造山带印支期构造-岩浆演化历史。对研究区内花岗岩进行了岩石学、年代学及岩石地球化学分析。分析结果表明，研究区花岗闪长岩和二长花岗斑岩锆石LA-ICP-MS U-Pb年龄分别为（225.7±1）Ma、（213.74±1）Ma，为晚三叠世岩浆活动产物。岩石地球化学分析结果显示，该地区晚三叠世侵入岩属高钾钙碱性系列，饱和铝指数显示为偏铝质到过铝质，富集Rb、Th、K等大离子亲石元素和轻稀土元素，明显亏损Nb、P、Ti等高场强元素。花岗岩具有I型花岗岩特征，具有板块俯冲阶段的特征。通过分析认为岩浆岩形成于板块碰撞前的火山弧环境中。
- 花岗岩 /
- 地球化学 /
- 晚三叠世 /
- 那陵郭勒河河中游 /
- 东昆仑
Abstract: The middle reaches of Naling Guole River is located in the western part of Qimantage area in East Kunlun Mountains, where a large number of granites are distributed. The study of the Late Triassic intrusive rocks in this area is of help to understand the Indosinian tectono-magmatic evolution history of the East Kunlun orogenic belt. Petrological, chronological and geochemical analyses of granites in the study area were carried out. The results show that the zircon LA-ICP-MS U-Pb ages of granodiorite and monzogranite porphyry in the study area are (225.7+1) Ma and (213.74+1) Ma respectively, which are the products of late Triassic magmatism. The results of petrogeochemical analysis show that the Late Triassic intrusive rocks in this area belong to the high-K calc-alkaline series. The saturated aluminium index shows that they are meta-aluminous to peraluminous, enriched with large ion lithophile elements such as Rb, Th, K and light rare earth elements, and obviously depleted with high field strength elements such as Nb, P and Ti. Granite is characterized by highly differentiated I-type granite and plate subduction stage. The analysis shows that the magmatite formed in the volcanic arc environment before plate collision.
- granite /
- geochemistry /
- Late Triassic /
- middle reaches of the Naling Guole River /
- East Kunlun

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