喜马拉雅造山带东段拉隆淡色花岗岩的成因及其与藏南拆离系的关系

吴健; 田世洪; 李光明; 付建刚; 郭伟康; 许伟; 李浩通; 李文强; 向开义; 黄昌祺; 刘文斌

doi:10.3799/dqkx.2025.049

Volume 50 Issue 7

Jul. 2025

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Article Navigation > Earth Science > 2025 > 50(7): 2593-2612

Wu Jian, Tian Shihong, Li Guangming, Fu Jiangang, Guo Weikang, Xu Wei, Li Haotong, Li Wenqiang, Xiang Kaiyi, Huang Changqi, Liu Wenbin, 2025. Petrogenesis of Lalong Leucogranites in Eastern Himalayan Orogenic Belt and Relationship with South Tibetan Detachment System. Earth Science, 50(7): 2593-2612. doi: 10.3799/dqkx.2025.049

Citation:

Wu Jian, Tian Shihong, Li Guangming, Fu Jiangang, Guo Weikang, Xu Wei, Li Haotong, Li Wenqiang, Xiang Kaiyi, Huang Changqi, Liu Wenbin, 2025. Petrogenesis of Lalong Leucogranites in Eastern Himalayan Orogenic Belt and Relationship with South Tibetan Detachment System. Earth Science, 50(7): 2593-2612. doi: 10.3799/dqkx.2025.049

Citation:

Wu Jian, Tian Shihong, Li Guangming, Fu Jiangang, Guo Weikang, Xu Wei, Li Haotong, Li Wenqiang, Xiang Kaiyi, Huang Changqi, Liu Wenbin, 2025. Petrogenesis of Lalong Leucogranites in Eastern Himalayan Orogenic Belt and Relationship with South Tibetan Detachment System. Earth Science, 50(7): 2593-2612. doi: 10.3799/dqkx.2025.049

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Petrogenesis of Lalong Leucogranites in Eastern Himalayan Orogenic Belt and Relationship with South Tibetan Detachment System

doi: 10.3799/dqkx.2025.049

Wu Jian^{1, 2
,
,},
Tian Shihong^{1, 3
,
,},
Li Guangming⁴,
Fu Jiangang⁴,
Guo Weikang⁴,
Xu Wei^{1, 3},
Li Haotong^{1, 2},
Li Wenqiang^{1, 2},
Xiang Kaiyi^{1, 2},
Huang Changqi^{1, 2},
Liu Wenbin^{1, 2}

1.
National Key Laboratory of Uranium Resources Exploration-Mining and Nuclear Remote Sensing, Nanchang 330013, China
2.
School of Earth Sciences, East China University of Technology, Nanchang 330013, China
3.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
4.
Chengdu Center, China Geological Survey, Chengdu 610081, China

Received Date: 2024-10-30
Publish Date: 2025-07-25

Abstract

Abstract

As a product of collision orogenic belt, leucogranites are not only closely related to rare metal mineralization, but also have great significance to orogenesis and plateau uplift mechanism. The petrogenesis of leucogranites is still controversial. Earlier studies suggested that leucogranites were generated by low-degree in-situ partial melting of metasedimentary rocks, but in recent years, more scholars have pointed out that they may be highly fractionated granites, and the magma had undergone an intensive fractional crystallization. In order to explore the petrogenesis of leucogranites, we collected Lalong leucogranites and their sedimentary surrounding rocks (marbles and slates) in the eastern Himalayan orogenic belt to analyze the major and trace elements, Sr-Nd isotopes and monazite U-Th-Pb dating. Lalong leucogranites are located in the core of the Lalong dome, where two-mica granites, muscovite granites and albite granites are exposed in turn from inside to outside. The dating results show that these three leucogranites have similar emplacement ages (22-23 Ma). Generally, the leucogranites show high SiO₂ (73.0%-75.7%), high K₂O (3.50%-6.53%), low MgO (0.03%-0.22%) and peraluminum (A/CNK=1.05-1.24). From two-mica granites through muscovite granites to albite granites, the negative Eu anomalies became intensified, Rb, Rb/Sr and Y/Ho gradually increased, while Sr, Ba, K/Rb and Zr/Hf gradually decreased. In addition, these leucogranites have consistent Sr-Nd isotopic compositions: (⁸⁷Sr/⁸⁶Sr)_i=0.736 456-0.737 929, ε_Nd(t)=-12.4 to -12.1, which are more depleted than that of the surrounding rocks (ε_Nd(t)=-16.9 to -15.1). Two-mica granites have consistent Sr-Nd isotopic compositions with the higher Himalayan crystallines, the high CaO/Na₂O ratio values (0.33-0.42) and Al₂O₃/TiO₂ ratio values (197-459), indicating that their source region is dominated by clastic rocks. The spatial distribution characteristics in the field and data results show that the Lalong leucogranites may have originated from muscovite dehydration melting of metagreywacks in higher Himalayan crystallines, which had undergone certain degree of fractional crystallization rather than generated by in-situ partial melting of metasedimentary rocks. The trace element Rayleigh fractionation modeling results also prove that when two-mica granite is used as the initial melt, it could generate muscovite granites and albite granites after fractional crystallization of about 70% and about 90%, respectively. Considering the overlapping relationship between the South Tibetan Detachment System and the Lalong leucogranites, this paper considers that the South Tibetan Detachment System may have triggered partial melting of the leucogranites source region by decompression and provided space for the flowage differentiation of the leucogranites.
- leucogranite,
- monazite U-Th-Pb dating,
- whole-rock geochemistry,
- Sr-Nd isotopes,
- petrogenesis,
- Lalong dome,
- South Tibetan Detachment System,
- Tethyan Himalaya,
- geochemistry

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References(79)

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Petrogenesis of Lalong Leucogranites in Eastern Himalayan Orogenic Belt and Relationship with South Tibetan Detachment System

doi: 10.3799/dqkx.2025.049

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