吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (6): 1754-1768.doi: 10.13278/j.cnki.jjuese.201606113

• 地质与资源 • 上一篇    下一篇

西准噶尔包古图I号岩体的锆石U-Pb年代学和地球化学特征

尹继元1,2, 陈文1, 肖文交2, 罗勇3, 张斌1, 杨莉1, 喻顺1, 徐翠4   

  1. 1. 中国地质科学院地质研究所同位素热年代学实验室/大陆构造与动力学国家重点实验室, 北京 100037;
    2. 中国科学院地质与地球物理研究所/岩石圈演化国家重点实验室, 北京 100029;
    3. 南阳师范学院南阳市独山玉研究重点实验室, 河南 南阳 473061;
    4. 河北省区域地质矿产调查研究所, 河北 廊坊 065000
  • 收稿日期:2016-03-25 出版日期:2016-11-26 发布日期:2016-11-26
  • 作者简介:尹继元(1983),男,副研究员,博士,主要从事同位素年代学和地球化学研究,E-mail:yinjiyuan1983@163.com
  • 基金资助:
    国家重点基础研究发展计划项目（2014CB448000）；中国地质调查项目（DD20160123-02）；中国地质科学院地质研究所基本科研业务费项目（J1517）；同位素地球化学国家重点实验室开放基金（中国科学院广州地球化学研究所）项目（SKLIG-KF-13-05）

Geochronology and Geochemistry in Pluton I in Baogutu Area, West Junggar

Yin Jiyuan1,2, Chen Wen1, Xiao Wenjiao2, Luo Yong3, Zhang Bin1, Yang Li1, Yu Shun1, Xu Cui4   

  1. 1. Laboratory of Isotope Thermochronology, Institute of Geology, Chinese Academy of Geological Sciences/State Key Laboratory of Continental Tectonics and Dynamics, Beijing 100037, China;
    2. State Key Laboratory of Lithospheric Evolution/Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
    3. Nanyang City Key Laboratory of Dushan Jade, Nanyang Normal University, Nanyang 473061, Henan China;
    4. Regional Geology and Mineral Resources Survey of Hebei Province, Langfang, 065000, Hebei, China
  • Received:2016-03-25 Online:2016-11-26 Published:2016-11-26
  • Supported by:
    Supported by the Major Basic Research Project of the Ministry of Science and Technology of China (2014CB448000), the China Geological Survey (DD20160123-02), the Outlay Research Fund of Institute of Geology, Chinese Academy of Geological Sciences (J1517) and the Rresearch Grant of State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (SKLIG-KF-13-05)

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摘要： 西准噶尔包古图地区发育一些小型的闪长质岩体。前人对这些小岩体开展了岩石学、年代学和地球化学等研究，然而，其成因机制和构造背景仍然存在争议，阻碍了区域构造演化和成矿作用的认识。本文在前人研究的基础上，选择包古图I号岩体为研究对象，有望揭示包古图岩体的岩石成因和构造背景。锆石U-Pb年代学研究显示，包古图I号岩体形成于（313.8±1.1）Ma。包古图I号闪长岩体以富SiO2（58.0%~59.0%）、Al2O3（16.6%~17.4%）和Sr（757×10-6~882×10-6），低的Y（14.6×10-6~15.7×10-6）和Yb（1.51×0-6~1.60×0-6）质量分数为特征，具有高的Sr/Y（50~59）值和弱的Eu异常，类似于俯冲成因的埃达克岩。另外，这些闪长岩具有较高的Mg（w（MgO）=3.46%~3.77%，Mg#=52.8~53.2），高的Cr（63.8×10-6~74.7×10-6）和Ni（45.2×10-6~49.8×10-6）质量分数，亏损HFSE（Nb，Ta和Ti）。该闪长质岩体可能由俯冲的板片熔体与上覆地幔相互作用而成。它的形成可能与西准噶尔地区晚石炭世的洋脊俯冲作用有关。

关键词: 西准噶尔, 包古图I号岩体, 埃达克岩, 洋脊俯冲, 地球化学

Abstract: Some small-size dioritic plutons widely occur in the Baotutu area, west Junggar. The petrology, geochronology and geochemistry of thse plutons had been researched, while their petrogenesis and tectonic setting still existed controversy, which restricts the knowledge of the tectonic evolution and mineralization. To reveal the petrogenesis and tectonic setting of Baogutu dioritic plutons during Late Caberniferious, on basis of previous researches, this paper chooses pluton I in the Baogutu area as research subjects. The LA-ICP-MS zircon U-Pb for dioritic pluton I yield 206Pb/238U age of(313.8±1.1)Ma. The dioritic pluton is characterized by relatively high SiO2 (58.0%-59.0%), Al2O3 (16.6%-17.4%), Sr ((757-882)×10-6), and low Y ((14.6-15.7)×10-6) and Yb ((1.51-1.60)×10-6) contents, with high Sr/Y (50-59) ratios and slight Eu anomalies, which are analogous to those of slab-derived adakites. In addition, the dioritic pluton is relatively rich in MgO (MgO=3.46%-3.77%; Mg#=52.8-53.2), Cr ((63.8-74.7)×10-6), Ni ((45.2-49.8)×10-6), with negative Nb-Ta-Ti anomalies. The dioritic pluton is generated by partial melting of a subducted oceanic slab and subsequent melt-mantle interaction. The formation of the adakitic pluton in the Baogutu area was probably associated with the ridge subduction during Late Carboniferous period.

Key words: west Junggar, pluton I of Baogutu area, Adakite, ridge subduction, geochemistry

中图分类号: 

  • P588.122
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