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2024 Vol. 30, No. 5
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WANG Bingzhang, LI Wufu, ZHENG Ying, WANG Chuntao, ZHAO Zhongguo, JIN Tingting, CAO Jinshan, FU Changlei. 2024. Petrogenesis and geological significance of the Late Indosinian adakitic granites in the East Kunlun Orogen. Journal of Geomechanics, 30(5): 834-864. doi: 10.12090/j.issn.1006-6616.2024030
Citation: WANG Bingzhang, LI Wufu, ZHENG Ying, WANG Chuntao, ZHAO Zhongguo, JIN Tingting, CAO Jinshan, FU Changlei. 2024. Petrogenesis and geological significance of the Late Indosinian adakitic granites in the East Kunlun Orogen. Journal of Geomechanics, 30(5): 834-864. doi: 10.12090/j.issn.1006-6616.2024030
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Petrogenesis and geological significance of the Late Indosinian adakitic granites in the East Kunlun Orogen

  • 1.

    Bureau of Geological Exploration & Development of Qinghai Province, Xining 810008, Qinghai, China

  • 2.

    Key Laboratory of the Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources, Xining 810012, Qinghai, China

  • 3.

    Qinghai Geological Survey Institute, Xining 810012, Qinghai, China

  • 4.

    University of Chinese Academy of Sciences, Beijing 100049, China

  • 5.

    State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China

  • 6.

    Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

    • Fund Project: This research is financially supported by the Second Tibetan Plateau Scientific Expedition and Research (Grant No. 2019QZKK0702), Geological and Mineral Exploration Project of the Qinghai Provincial Development Bureau (Grant No. [2021]61)，and Qinghai Provincial Geological Exploration Special Funding (Grant No. 2024524015jc015).
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  • Author Bio: 王秉璋，青海省地质矿产勘查开发局正高级工程师，博士生导师。2023年获得第十八次李四光地质科学奖野外奖。从事青藏高原地质工作30余年，入选国务院政府特殊津贴专家、国土资源高层次创新型科技人才培养工程（科技领军人才），自然资源部高层次科技创新人才，青海省昆仑英才（杰出人才）。发现青藏高原东北部茶卡北山印支期Li-Be矿化伟晶岩带、三江北段草陇−尕朵伟晶岩型Li-Be矿集区；首次在东昆仑发现铌磷矿化碱性岩−碳酸岩杂岩体，铌矿找矿取得重要进展；“358”找矿行动中主持4个整装勘查区找矿勘探和找矿部署研究，新发现矿产地10处、大—中型矿床7处，组织开展中—大比例尺矿产远景调查，圈定找矿靶区500余处，发现了大量后备勘查基地；参加国土资源大调查，填补青藏高原北部地质空白。出版专著5部，发表SCI和EI论文40余篇，获国家科技进步特等奖1项（R21）、省部级一等奖3项（R2、R4、R12）、二等奖4项（R1、R2、R3、R4）等
Received Date:  24 March 2024
Revised Date:  30 July 2024
Accepted Date:  01 August 2024
Available Online:  02 August 2024
Publish Date:  28 October 2024
    Abstract
  • Objective

    The Indosinian collision process of the East Kunlun Orogenic Belt remains a subject of debate. The newly discovered Triassic adakitic granites in the Xiaonanchuan area of East Kunlun provide new geological evidence that constrains the evolution of collisional orogenesis.

    Methods

    This study conducted petrological, geochemical, zircon U-Pb, and Lu-Hf isotopic analyses of the Moshigou and Bentoushan granitic intrusions in the Xiaonanchuan area to investigate their petrogenesis and tectonic settings. By integrating previous research on magmatism and sedimentation during the late Indosinian period within the East Kunlun Orogenic Belt, a preliminary discussion was conducted on collisional orogensis process.

    Results and Conclusion

    The Moshigou intrusion consists of granodiorite and monzogranite with zircon U-Pb ages of 209–208 Ma. The Bentoushan intrusion is composed of granodiorite with zircon U-Pb ages of 201–200 Ma. These granitoids have high SiO2 and Al2O3 contents and are rich in sodium. They also have high Sr contents (398×10−6–613×10−6) and Sr/Y ratios (50–97) and are depleted in heavy rare earth elements without Eu anomalies, exhibiting typical geochemical characteristics of adakitic rocks. The Moshigou granitoids have negative whole-rock εNd(t) (−3.60 to −3.34) and variable zircon εHf(t) (−1.3 to +5.9), indicating their derivation from the partial melting of the thickened lower crust. The Bentoushan granitoids have negative whole-rock εNd(t) (−1.65 to −1.55) and positive zircon εHf(t) (+3.4 to +7.3), suggesting their origin from meta-basic rock-dominated thickened lower crust with eclogite residue. Significance These results suggest that they were formed in a post-collisional extension setting. A comprehensive analysis indicates that the East Kunlun Orogenic Belt was in the collision and post-collision stages during the Late Triassic. The post-collision stage can be further divided into two phases of magmatic activity: early and late phases of the Late Triassic.
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