亚东地区高喜马拉雅结晶岩系部分熔融的时限：来自乃堆拉混合岩锆石U-Pb年代学的约束

苟正彬; 刘函; 段瑶瑶; 李俊; 张士贞

doi:10.3799/dqkx.2020.110

Volume 45 Issue 8

Aug. 2020

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Article Navigation > Earth Science > 2020 > 45(8): 2894-2904

Gou Zhengbin, Liu Han, Duan Yaoyao, Li Jun, Zhang Shizhen, 2020. Timescales of Partial Melting in Yadong Region of Higher Himalayan Crystalline Sequence: Constraints from Zircon U-Pb Geochronology of Naiduila Migmatites. Earth Science, 45(8): 2894-2904. doi: 10.3799/dqkx.2020.110

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Gou Zhengbin, Liu Han, Duan Yaoyao, Li Jun, Zhang Shizhen, 2020. Timescales of Partial Melting in Yadong Region of Higher Himalayan Crystalline Sequence: Constraints from Zircon U-Pb Geochronology of Naiduila Migmatites. Earth Science, 45(8): 2894-2904. doi: 10.3799/dqkx.2020.110

Citation:

Gou Zhengbin, Liu Han, Duan Yaoyao, Li Jun, Zhang Shizhen, 2020. Timescales of Partial Melting in Yadong Region of Higher Himalayan Crystalline Sequence: Constraints from Zircon U-Pb Geochronology of Naiduila Migmatites. Earth Science, 45(8): 2894-2904. doi: 10.3799/dqkx.2020.110

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Timescales of Partial Melting in Yadong Region of Higher Himalayan Crystalline Sequence: Constraints from Zircon U-Pb Geochronology of Naiduila Migmatites

doi: 10.3799/dqkx.2020.110

Chengdu Center of China Geological Survey, Chengdu 610081, China

Received Date: 2020-04-13
Publish Date: 2020-08-15

Abstract

Abstract

The Higher Himalayan Crystalline Sequence is composed mainly of middle-high grade metamorphic rocks and leucogranites, forming a natural laboratory for studying the formation and evolution of the Himalayan orogen. However, the geological significance of the U-Pb ages remains controversial because zircons and monazites of the migmatites and leucogranites from the Higher Himalayan Crystalline Sequence commonly have yielded variable U-Pb ages, which significantly restricts our understanding of timing and duration of metamorphism, partial melting and melt crystallization of the orogen.Here it presents zircon U-Pb geochronological study of the Naiduila migmatites in Yadong region from the upper structural level of the Higher Himalayan Crystalline Sequence, middle Himalaya. The results show that zircons from the melanosomes of the migmatites in Naiduila area have variable U-Pb ages ranging from 29.1 to 24.7 Ma, and zircons from the leucosomes of the migmatites yield various U-Pb ages of 25.0-13.7 Ma. The former may be interpreted as the timing and duration of prograde metamorphism and partial melting, and the latter represents timescales of retrogressive metamorphism and melt crystallization.Therefore, it is proposed that the partial melting of the Higher Himalayan Crystalline Sequence in the Yadong region initiated at ca.30 Ma and lasted to ca.13 Ma, indicating that it is a long-term and sustained process. The study also indicates that the timing of partial melting of the Higher Himalayan Crystalline Sequence is earlier than the starting activation of the South Tibetan detachment and the Main Central Thrust. This may further indicates that the partial melting occurred during subduction. The study provides new information on the structural evolution model of the orogen.
- Higher Himalayan Crystalline Sequence,
- partial melting,
- duration,
- migmatite,
- zircon U-Pb,
- geochronology

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Timescales of Partial Melting in Yadong Region of Higher Himalayan Crystalline Sequence: Constraints from Zircon U-Pb Geochronology of Naiduila Migmatites

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