青海省天峻县阳康地区花岗岩岩体锆石U-Pb年代学及地球化学特征研究

方永坤; 曹成刚; 董峻麟; 李领贵

doi:10.11720/wtyht.2021.1185

青海省天峻县阳康地区花岗岩岩体锆石U-Pb年代学及地球化学特征研究

1.青海省环境地质勘查局,青海西宁 810001;

2.青海九零六工程勘察设计院,青海西宁 810001;

3.青海省环境地质重点实验室,青海西宁 810001;

4.青海省地质环境保护与灾害防治工程技术研究中心,青海西宁 810001;

5.青海省第五地质勘查院,青海西宁 810000

基金项目:
青海省地质勘查基金项目

青海省天峻县阳康地区J47E13011等五幅1

5万区域地质矿产调查(青国土资矿[2011]277)

详细信息

作者简介: 方永坤(1986-),男,硕士,工程师,矿床地球化学方向。Email:36529429@qq.com

中图分类号: P632

收稿日期: 2020-04-19

修回日期: 2021-12-20

刊出日期: 2021-12-21

Geochronology and geochemistry of the granodiorite intrusion in Yangkang area of Qinghai Province and its geological significance

1. Qinghai Environmental Geological Exploration Bureau, Xining 810000, China;

2. No.906 Engineering Survey and Design Institute of Qinghai Province, Xining 810000, China;

3. Key Laboratory of Environmental Geology Qinghai Province,Xining 810000, China;

4. Qinghai Engineering Research Center of Geoenvironment Pritection and Geohazard prevention,Xining 810000, China;

5. No.5 Geological and Mineral Survey Institute of Qinghai Province, Xining 810000, China

Received Date: 19 April 2020

Revised Date: 20 December 2021

Publish Date: 21 December 2021

摘要

摘要: 对南祁连阳康地区花岗闪长岩岩体进行了锆石U-Pb年代学及岩石地球化学研究,以便对其岩石成因和中—南祁连消减拼合作用的开始时间给予制约。花岗闪长岩中LA-ICP-MS锆石U-Pb定年结果表明,该岩体形成于晚奥陶世(444±1.2 Ma, MSWD=1.14),属于高钾钙碱性系列,A/CNK值介于1.007~1.104,属弱过铝质,为I型花岗岩,并且明显富集大离子亲石元素(如K、Ba、Rb)、轻稀土元素(LREE)及Th,相对亏损高场强元素(如Ta、Nb)。上述结果表明,该类岩体的原始岩浆应起源于地壳的部分熔融。综合区域同时代火成岩的研究成果,认为花岗闪长岩岩体形成于活动大陆边缘的构造背景。
- 晚奥陶世 /
- 锆石U-Pb测年 /
- 岩石地球化学 /
- 阳康花岗岩 /
- 南祁连块体
Abstract: The formation age and petrogenesis of the Yangkang granites in the Qilian block remain controversial. In this study, LA-ICP-MS zircon U-Pb dating and whole-rock geochemical analysis were conducted to constrain the petrogenetic and tectonic processes during the formation of the granites. The results show that U-Pb age of granodiorite in Yangkang pluton is 444±1.2Ma, (MSWD=1.14), indicating that it was formed in the early Late Ordovician and that the rocks belong to weak peraluminous-strong peraluminous I-type granite.The rocks are enriched with large ion lithophile elements (K,Ba, Rb) and Light Rare Earth Elements (LREEs) and Th, but depleted in the high field strength elements (e.g., Ta-Nb). The above results show that Yangkang granites were derived from partial melting of continental crust. Combined with the regional data, the authors suggest that the Yangkang granites were probably formed in an active continental margin during Late Ordovician.
- late Ordovician /
- zircon U-Pb dating /
- rock geochemistry /
- Yangkang granite /
- south Qilian block

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中国自然资源航空物探遥感中心	主办
地质出版社	出版

青海省天峻县阳康地区花岗岩岩体锆石U-Pb年代学及地球化学特征研究

作者简介: 方永坤(1986-),男,硕士,工程师,矿床地球化学方向。Email:36529429@qq.com

Geochronology and geochemistry of the granodiorite intrusion in Yangkang area of Qinghai Province and its geological significance

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