南拉萨地块中部早侏罗世仁钦则花岗闪长岩成因及其地质意义

邹洁琼; 余红霞; 王保弟; 黄丰; 曾云川; 黄文龙; 文雅倩; 张钊; 范子尘; 谈荣钰

doi:10.3799/dqkx.2018.589

Volume 43 Issue 8

Aug. 2018

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Article Navigation > Earth Science > 2018 > 43(8): 2795-2810

Zou Jieqiong, Yu Hongxia, Wang Baodi, Huang Feng, Zeng Yunchuan, Huang Wenlong, Wen Yaqian, Zhang Zhao, Fan Zichen, Tan Rongyu, 2018. Petrogenesis and Geological Implications of Early Jurassic Granodiorites in Renqinze Area, Central Part of Southern Lhasa Subterrane. Earth Science, 43(8): 2795-2810. doi: 10.3799/dqkx.2018.589

Citation:

Zou Jieqiong, Yu Hongxia, Wang Baodi, Huang Feng, Zeng Yunchuan, Huang Wenlong, Wen Yaqian, Zhang Zhao, Fan Zichen, Tan Rongyu, 2018. Petrogenesis and Geological Implications of Early Jurassic Granodiorites in Renqinze Area, Central Part of Southern Lhasa Subterrane. Earth Science, 43(8): 2795-2810. doi: 10.3799/dqkx.2018.589

Citation:

Zou Jieqiong, Yu Hongxia, Wang Baodi, Huang Feng, Zeng Yunchuan, Huang Wenlong, Wen Yaqian, Zhang Zhao, Fan Zichen, Tan Rongyu, 2018. Petrogenesis and Geological Implications of Early Jurassic Granodiorites in Renqinze Area, Central Part of Southern Lhasa Subterrane. Earth Science, 43(8): 2795-2810. doi: 10.3799/dqkx.2018.589

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Petrogenesis and Geological Implications of Early Jurassic Granodiorites in Renqinze Area, Central Part of Southern Lhasa Subterrane

doi: 10.3799/dqkx.2018.589

1.
State Key Laboratory of Isotope Geochemistry of Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
School of Earth Science, Guilin University of Technology, Guilin 541004, China
4.
Chengdu Center of China Geological Survey, Chengdu 610081, China
5.
School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2018-04-09
Publish Date: 2018-08-15

Abstract

Abstract

The opening and subduction time of the Neo-Tethys ocean in the southern part of the Lhasa block on the Qinghai-Tibet Plateau ramains controversial.The widely developed Mesozoic granitoids in the southern Lhasa subterrane of Tibetan Plateau, are essential samples to explore the prolonged evolution of subduction process of the Neo-Tethys before collision between the Asia and India continents.Here, we present detailed zircon U-Pb dating, trace element and Hf isotope, whole-rock major and trace elements, and Sr-Nd isotope data for the granodiorites from the Renqinze area, central part of southern Lhasa subterrane.The granodiorites were crystallized at ca.180 Ma, which belongs to Early Jurassic.They are characterized by relatively high SiO₂ (62.77%-64.18%) contents and low K₂O/Na₂O (0.29-0.60) and A/CNK values (0.90-0.98).These geochemical characteristics are similar to Ⅰ-type calc-alkaline rocks.Renqinze granodiorites are enriched in LILEs (e.g. Ba and U) and depleted in HFSEs (e.g. Nb and Ta), showing the geochemical affinity of arc-related magmatism.The granodiorites fall into the range of partial melts of meta-basaltic rocks due to their high CaO, low total alkaline and Al₂O₃ contents.The accordant results of Ti-in-zircon and whole-rock zircon saturation temperature suggest that the Renqinze granitoid rocks were derived from the lower continental crust.Moreover, the granodiorites show low (⁸⁷Sr/⁸⁶Sr)_i(0.703 671-0.703 794), high ε_Nd(t)(5.41-5.66) and zircon ε_Hf(t)(12.6-14.8) values, indicating they were likely generated from partial melting of a juvenile mafic lower crust.The Renqinze granitodiorites represent the products of subduction of the Neo-Tethys ocean.The timing for the opening of the Neo-Tethys is at least before Late Triassic.
- Renqinze,
- granodiorites,
- Sr-Nd-Hf isotopes,
- southern Lhasa subterrane,
- Neo-Tethys ocean,
- subduction,
- geochemistry,
- geochronology

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References(52)

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