| 青海玉树地区扎喜科岩体形成时代、地球化学特征及构造意义研究 |
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| 关键词:Yushu area Xijinwulan-Jinshajiang suture zone Zhaxike quartz diorite tectonic setting 40Ar/ 39Ar age |
| 基金项目:国土资源部公益性行业科研专项经费课题(编号: 201011027-1B);地质矿产调查评价项目(编号: 1212011120294) |
| 作者 | 单位 | E-mail | | 李洁 | 中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室, 同位素热年代学实验室
中国地质大学(北京) | huaer3312@sina.com | | 陈文 | 中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室, 同位素热年代学实验室 | chenwenf@vip.sina.com | | 雍拥 | 中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室, 同位素热年代学实验室 | | | 陈岳龙 | 中国地质大学(北京) | | | 孙敬博 | 中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室, 同位素热年代学实验室 | | | 张彦 | 中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室, 同位素热年代学实验室 | | | 刘新宇 | 中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室, 同位素热年代学实验室 | | | 杨莉 | 中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室, 同位素热年代学实验室 | |
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| Emplacement Age, Geochemical Characteristics and Tectonic Significance of Zhaxike Quartz Diorite in Yushu Area, Qinghai Province |
| Zhaxike quartz diorite is located in Yushu area of Qinghai province, and is exposed along the western Jinshajiang suture zone. Petrologic and geochemical studies suggest that the samples have the characteristics of negative Eu anomalies (δEu=0.6–0.76) and LREE enrichment ((La/Yb)N=2.56–4.37). All rock samples are enriched in large ion lithophile elements (LILE) and depleted in high field strength elements (HFSE), K* values range from 4.18 to 4.89, and RbN/YbN ratios range from 9.77 to 12.09. These data show that Zhaxike quartz diorite is magmatic rocks of island arc. The authors used both major elements and trace elements to determine its tectonic setting. The tectonic discrimination diagrams show that Zhaxike quartz diorite is island arc granitoids (IAG) related to plate subduction. The 40Ar/39Ar plateau age of hornblende shows that the intrusion of Zhaxike quartz diorite took place at about (222±1.7) Ma in Indosinian period. Based on the study of petrology, geochemistry and chronology, the authors preliminarily hold that Xijinwulan-Jinshajiang suture zone remained in the island arc setting in the late Triassic period, and the subduction of the plate still continued. The results of the study provide the petrologic and chronologic constraints for the last evolution of the Paleo-Tethys. |
| LI Jie,CHEN Wen,YONG Yong,CHEN Yue-long,SUN Jing-bo,ZHANG Yan,LIU Xin-yu,YANG Li.2012.Emplacement Age, Geochemical Characteristics and Tectonic Significance of Zhaxike Quartz Diorite in Yushu Area, Qinghai Province[J].Acta Geoscientica Sinica,33(5):773-786. |
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