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东昆仑造山带大水沟中酸性侵入岩的形成时代及岩石地球化学特征
引用本文:邓红宾, 谢启兴, 魏华财, 孙萍, 姚波. 东昆仑造山带大水沟中酸性侵入岩的形成时代及岩石地球化学特征[J]. 中国地质调查, 2018, (1): 51-59. doi: 10.19388/j.zgdzdc.2018.01.08
作者姓名:邓红宾  谢启兴  魏华财  孙萍  姚波
作者单位:四川省地质矿产勘查开发局川西北地质队,绵阳,621000;; 四川省地质矿产勘查开发局川西北地质队,绵阳,621000;; 四川省地质矿产勘查开发局川西北地质队,绵阳,621000;; 四川省地质矿产勘查开发局川西北地质队,绵阳,621000;; 四川省地质矿产勘查开发局川西北地质队,绵阳,621000
基金项目:青海省国土资源厅地质勘查基金“青海省格尔木市大水沟地区J46E024022、J46E024023、I46E001022、I46E001023四幅1:5万区域地质矿产调查(编号: 青国土资矿[2009]243号)”项目资助
摘    要:对东昆仑造山带东段大水沟一带开展锆石U-Pb测年和岩石地球化学研究.获得英云闪长岩锆石U-Pb定年为(402±2)Ma,属早泥盆世华力西期.岩石地球化学特征显示:Al饱和指数A/CNK集中在0.946~1.077之间;轻重稀土比值LREE/HREE在2.94~18.93范围,显示轻稀土富集;δEu在0.01~0.85之间,属于Eu亏损型;δCe在0.95~1.23之间,反映出无异常—轻微富集.岩体整体显示以I型花岗岩为主的特点,结合构造环境判别图解,综合判断大水沟一带中酸性侵入岩属东昆仑东段早泥盆世后碰撞造山花岗岩.

关 键 词:东昆仑造山带   中酸性侵入岩   锆石U-Pb定年   早泥盆世
收稿时间:2017-05-27

Formation age and petrological geochemical characteristics of intermediate-acid intrusive rocks in Dashuigou of East Kunlun organic belt
DENG Hongbin, XIE Qixing, WEI Huacai, SUN Ping, YAO Bo. Formation age and petrological geochemical characteristics of intermediate-acid intrusive rocks in Dashuigou of East Kunlun organic belt[J]. Geological Survey of China, 2018, (1): 51-59. doi: 10.19388/j.zgdzdc.2018.01.08
Authors:DENG Hongbin  XIE Qixing  WEI Huacai  SUN Ping  YAO Bo
Affiliation:Northwest Sichuan Geological Team, Bureau of Geology and Mineral Exploration and Development of Sichuan Province, Mianyang 621000, China
Abstract:The authors investigated zircon U-Pb dating and petrological geochemical characteristics in the east of East Kunlun orogenic belt. The results show that the U-Pb age of zircons in tonalite is (402±2) Ma, belonging to Early Devonian of Variscan. The petrological geochemical characteristics show that the aluminium saturation A/CNK index ranges from 0.946 to 1.077, and the ratio of light rare earth elements and heavy rare earth elements (LREE/HREE) is from 2.94 to 18.93, which indicates the enrichment of light rare earth elements. And the δEu parameter is between 0.01 and 0.85, belonging to europium depletion type. The δCe parameter is between 0.95 and 1.23, reflecting normal-slightly enrichment. Overall, the rocks are mainly by I-type granite. Combined with the tectonic discrimination diagrams, the authors concluded that intermediate-acid intrusive rocks in Dashuigou are orogenic granite formed after Early Devonian.
Keywords:East Kunlun organic belt  intermediate-acid intrusive rocks  zircon U-Pb dating  Early Devonian
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