Vestiges of the Kerguelen Mantle Plume in Southern Tibet: Evidence from 123–117 Ma Magmatism in the Dingri Area of the Central Tethys Himalaya

doi:10.1111/1755-6724.15038

首页 > 过刊浏览>2023年第97卷第4期 >1163-1180. DOI:10.1111/1755-6724.15038

Vestiges of the Kerguelen Mantle Plume in Southern Tibet: Evidence from 123–117 Ma Magmatism in the Dingri Area of the Central Tethys Himalaya
DOI:
                        10.1111/1755-6724.15038
                    
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                        YAN SongtaoYAN Songtao

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WU QingsongWU Qingsong

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LI HuLI Hu

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DAI XuejianDAI Xuejian

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ZHU LidongZHU Lidong

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WANG JieWANG Jie

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XIN ChongyangXIN Chongyang

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YAN Songtao
YAN Songtao
1 Civil-Military Integration Center of China Geological Survey, China Geological Survey, Chengdu 610036, China 2 Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
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WU Qingsong
WU Qingsong
1 Civil-Military Integration Center of China Geological Survey, China Geological Survey, Chengdu 610036, China
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LI Hu
LI Hu
1 Civil-Military Integration Center of China Geological Survey, China Geological Survey, Chengdu 610036, China 3 College of Earth Science, Chengdu University of Technology, Chengdu 610059, China
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DAI Xuejian
DAI Xuejian
1 Civil-Military Integration Center of China Geological Survey, China Geological Survey, Chengdu 610036, China
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ZHU Lidong
ZHU Lidong
2 Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
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WANG Jie
WANG Jie
1 Civil-Military Integration Center of China Geological Survey, China Geological Survey, Chengdu 610036, China
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XIN Chongyang
XIN Chongyang
1 Civil-Military Integration Center of China Geological Survey, China Geological Survey, Chengdu 610036, China
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We greatly appreciated Editor-in-Chief and reviewers for their constructive comments and suggestions that greatly improved this manuscript. We sincerely thank LIU Tao, DAI Hongrui, WEI Yangchun, HUANG Hao and CHEN Peng for their help in sample collection and data analysis. This research was supported by the Geological Survey Project of China Geological Survey (Grant No. DD20211547) and the Basic Survey Project of Command Center of Natural Resources Comprehensive Survey (Grant No. ZD20220508).

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Abstract:

The widely distributed Early Cretaceous magmatism in the Tethys Himalaya (TH) of southern Tibet is related to the Kerguelen mantle plume. Associated magmatic activity products are distributed in the eastern TH, where the active age is earlier than the peak ages of the Kerguelen mantle plume. This study investigated magmatic activity of the Dingri area in the central TH which was coeval with the Kerguelen mantle plume. The intrusion in the Dingri area contains diabases and monzonites. The zircon age of diabase is 123 ± 1 Ma, and that of monzonite is 117 ± 1 Ma. Geochemistry and Sr-Nd isotopic analyses show that the mafic–intermediate dikes were formed in an intraplate extensional environment. The diabase is derived from the enriched lithospheric mantle and monzonite is derived from partial melting of the lower crust, with both magmatic evolutions being contaminated by crustal materials. These characteristics are similar to those of the Rajmahal–Sylhet basalt, a typical Kerguelen mantle plume product. The discovery of the Dingri mafic–intermediate dikes of the central TH suggests that the TH and Rajmahal–Sylhet Traps formed a continuous mantle plume overflow magmatic belt which was a product of the continuous eruption of the Kerguelen mantle plume.

Key words:geochronology, mafic–intermediate dikes, Kerguelen mantle plume, central Tethys Himalaya, East Gondwana

引用本文

YAN Songtao, WU Qingsong, LI Hu, DAI Xuejian, ZHU Lidong, WANG Jie, XIN Chongyang.2023. Vestiges of the Kerguelen Mantle Plume in Southern Tibet: Evidence from 123–117 Ma Magmatism in the Dingri Area of the Central Tethys Himalaya[J]. ACTA GEOLOGICA SINICA(English edition),97(4):1163~1180

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收稿日期:2022-08-29
最后修改日期:2023-01-10
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在线发布日期: 2023-08-17
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