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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第45卷

期数:

2023年第05期

页码:

1176-1191

栏目:

庆贺汤中立院士从事地质工作七十周年专辑

出版日期:

2023-09-15

文章信息/Info

Title:

Petrography, Geochronology, Geochemical Characteristics of Pingtai Pluton in Wulonggou Gold Orefield, East Kunlun Orogen, China and Their Tectonic Significance

文章编号:

1672-6561(2023)05-1176-16

作者:

李君阳¹; 薛春纪^1*; 王 斌²; 3; 赵晓波¹; 赵伟策⁴; 刘洋涛¹; 李 鹏²; 3; 韩 玉²; 3

(1. 中国地质大学(北京)地球科学与资源学院,北京 100083; 2. 青海省第一地质矿产勘查院,青海 海东 810699; 3. 青海省柴达木周缘大型超大型金矿深部探测技术创新工程技术中心,青海 海东 810699; 4. 北京矿产地质研究院有限责任公司,北京 100012)

Author(s):

LI Jun-yang¹;  XUE Chun-ji^1*;  WANG Bin²; 3;  ZHAO Xiao-bo¹;  ZHAO Wei-ce⁴;  LIU Yang-tao¹;  LI Peng²; 3;  HAN Yu²; 3

(1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; 2. The First Geological Exploration Institute of Qinghai Province, Haidong 810699, Qinghai, China; 3. Deep Exploration Technology Innovation Engineering Technology Center of Large and Super Large Dold Deposits Around Qaidam of Qinghai Province, Haidong 810699, Qinghai, China; 4. Beijing Institute of Geology for Mineral Resources Co., Ltd., Beijing 100012, China)

关键词:

花岗闪长岩;  地球化学;  锆石U-Pb年龄;  中三叠世;  构造演化;  东昆仑造山带;  古特提斯洋

Keywords:

granodiorite;  geochemistry;  zircon U-Pb age;  Middle Triassic;  tectonic evolution;  East Kunlun orogen;  Paleo-Tethyan ocean

分类号:

P597

DOI:

10.19814/j.jese.2022.10046

文献标志码:

A

摘要:

东昆仑五龙沟金矿田东南部出露中三叠世侵入体——平台岩体,为探究古特提斯洋俯冲演化过程提供了新的线索。对平台岩体内的花岗闪长岩开展了详细的岩相学、LA-ICP-MS锆石U-Pb年代学、岩石地球化学和Hf同位素研究。结果表明:平台岩体内的花岗闪长岩主要由斜长石(体积分数为45%～50%)、石英(20%～25%)、钾长石(20%～25%)、角闪石(5%)、黑云母(5%)组成; 花岗闪长岩锆石U-Pb加权平均年龄为(247±1)Ma,侵位于中三叠世; 主量元素特征显示SiO₂含量(质量分数)为64.88%～65.90%, FeO^T/MgO平均值为3.70,Fe₂O₃/FeO平均值为1.48,锆石饱和温度平均值为 770 ℃,因此,花岗闪长岩属于I型花岗岩; 球粒陨石标准化稀土元素配分模式表现为轻稀土元素富集、重稀土元素亏损的特征,并具有弱负Eu异常; 原始地幔标准化微量元素蛛网图具有富集大离子亲石元素(Cs、Rb、Ba)、亏损高场强元素(Nb、Ta等)的特征; 花岗闪长岩的锆石ε_Hf(t)值为-4.51～0.64,Hf二阶段模式年龄为1.54～1.22 Ga。综合地球化学特征和区域构造演化,东昆仑五龙沟金矿田平台岩体内的花岗闪长岩源区为陆壳物质,形成于与古特提斯洋俯冲有关的活动大陆边缘环境,进一步表明古特提斯洋在中三叠世时仍处于北向俯冲阶段。

Abstract:

The Middle Triassic Pingtai pluton, which occurs in the southeastern part of Wulonggou gold orefield, East Kunlun orogen, provides new insights into the subduction history of the Paleo-Tethyan ocean. The detailed petrology, whole-rock geochemistry, zircon U-Pb age and Hf isotopic data of granodiorite from Pingtai pluton were conducted. The results show that the granodiorite of Pingtai pluton mainly comprises plagioclase(the volume fraction is 45%-50%), quartz(20%-25%), K-feldspar(20%-25%), hornblende(5%), and biotite(5%), and it yields a zircon U-Pb weighted mean age of(247±1)Ma, suggesting an emplacement age of Middle Triassic; whole-rock geochemistry characteristics show that SiO₂ content varies from 64.88% to 65.90%, average ratios of FeO^T/MgO and Fe₂O₃/FeO are 3.70 and 1.48, respectively, and average saturation temperature for zircon is calculated to be 770 ℃. Therefore, it is suggested that the granodiorite belongs to strong peraluminous and high-potassium calcium alkaline series, which is similar to typical I-type granite. Chondrite-normalized REE pattern shows that the granodiorite is enriched in LREEs and depleted in HREEs with weak negative Eu anomaly. The ε_Hf(t)values range from -4.51 to 0.64, and the Hf model age is 1.54-1.22 Ga. In combination with regional geological data, it is suggested that the granodiorite of Pingtai pluton is generated in a continental magmatic arc setting, which is related to the northward subduction of the Paleo-Tethyan ocean, and its parental magma is derived from meta-sandstone of continental crust. It is further indicated that the subduction of the Paleo-Tethyan ocean might have lasted until the late Middle Triassic.

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备注/Memo

备注/Memo:

收稿日期:2022-10-23; 修回日期:2022-12-15投稿网址:http:∥jese.chd.edu.cn/
基金项目:青海省重点研发与转化计划项目(2021-SF-155); 国家重点研发计划项目(2017YFC0601202)
作者简介:李君阳(1993-),男,新疆库尔勒人,理学硕士研究生,E-mail:1664438067@qq.com。
*通讯作者:薛春纪(1962-),男,陕西眉县人,教授,博士研究生导师,理学博士,E-mail:chunji.xue@cugb.edu.cn。

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