藏北班公湖-怒江缝合带西段沙木罗组火山岩年代学、Hf同位素及地球化学特征

吴建亮; 刘文; 尹显科; 雷传扬; 王波

doi:10.3799/dqkx.2020.104

Volume 46 Issue 2

Feb. 2021

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Article Navigation > Earth Science > 2021 > 46(2): 444-459

Wu Jianliang, Liu Wen, Yin Xianke, Lei Chuanyang, Wang Bo, 2021. Geochronology, Zircon Hf Isotope and Geochemistry of Volcanic Rocks from Shamuluo Formation in Western Banggongco-Nujiang Suture Zone, North Tibet. Earth Science, 46(2): 444-459. doi: 10.3799/dqkx.2020.104

Citation:

Wu Jianliang, Liu Wen, Yin Xianke, Lei Chuanyang, Wang Bo, 2021. Geochronology, Zircon Hf Isotope and Geochemistry of Volcanic Rocks from Shamuluo Formation in Western Banggongco-Nujiang Suture Zone, North Tibet. Earth Science, 46(2): 444-459. doi: 10.3799/dqkx.2020.104

Citation:

Wu Jianliang, Liu Wen, Yin Xianke, Lei Chuanyang, Wang Bo, 2021. Geochronology, Zircon Hf Isotope and Geochemistry of Volcanic Rocks from Shamuluo Formation in Western Banggongco-Nujiang Suture Zone, North Tibet. Earth Science, 46(2): 444-459. doi: 10.3799/dqkx.2020.104

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Geochronology, Zircon Hf Isotope and Geochemistry of Volcanic Rocks from Shamuluo Formation in Western Banggongco-Nujiang Suture Zone, North Tibet

doi: 10.3799/dqkx.2020.104

Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resources Key Laboratory of Sichuan Province, Sichuan Geological Survey, Chengdu 610081, China

Received Date: 2020-02-09
Publish Date: 2021-02-15

Abstract

Abstract

The tectonic-magmatic evolution of the Banggongco-Nujiang suture zone is one of the hottest scientific problems related to fundamental geology of the Tibetan Plateau. The Mesozoic volcanic-intrusive rocks are widely distributed in the North Gangdese belt, which is also located in the southern of the Banghongco-Nujiang suture zone. However, the petrogenesis and geodynamic setting of those rocks remain under debate. It reports the newly found vocalic rock dissections from Shamuluo Formation in Awengcuo area, which are located at the west segment of Bangongco-Nujiang suture zone to explore these issues. Those rocks consist of lower dissection named Zhaguo andesite and central dissection named Angmuguo andesistic crystal tuff. Zircon U-Pb dating indicates that the Zhaguo andesite was emplaced at 141.3±1.7 Ma, and the Angmuguo andesistic crystal tuff was formed in the age of 134.0±0.4 Ma, which provides new chronological data for the Shamuluo Formation. The Zhaguo andesite exhibits SiO₂contents of 52.58%-55.35%, Al₂O₃ contents of 14.43%-15.44% with A/CNK ranging from 0.58 to 0.75, MgO contents of 6.12%-8.51%, Na₂O contents of 1.55%-5.03%, with Na₂O/K₂O ratios of 1.81-3.61 and Mg numbers of 57.6-63.2 (average in 59.8), which can be assigned to high-Mg andesite. The Angmuguo andesistic crystal tuff has contents of SiO₂ (55.83%-61.88%), MgO (2.73%-4.51%), Al₂O₃(17.75%-19.62%) with A/CNK of 0.90-1.08, Na₂O(1.55%-5.03%), and Na₂O/K₂O (1.81-3.61). All these samples are sodic low-K calc-alkaline series, and enriched in large ion lithopile elements (LILE) and depleted in high field strength elements (HFSE), showing a similar character of island arc-type magmas. The zircon ε_Hf(t) of Zhaguo andesite values are +15.5 to +18.7, and the Angmuguo andesistic crystal tuff values from +13.8 to +16.2, indicating that these rocks came from the partial melting of newly-formed lower crust. The Zhaguo high-Mg andesite has low contents of Y (11.9×10^-6-13.5×10^-6), Yb (1.32×10^-6-1.43×10^-6), and high Sr (481×10^-6-794×10^-6) with the ratios of Sr/Y (35.6-65.6) and La_N/Yb_N(8.2-10.4). The melt of subducted slab and metasomic mantle peridoite played a great role on its forming process. Based on the above data, it is proposed that the volcanic rock magma from Shamuoluo Formation formed in inland-arc setting, which can be the early magma response of Bangongco-Nujiang Tethyan Ocean's southward subduction.
- Shamuluo Formation,
- high-Mg andesite,
- Bangongco-Nujiang suture zone,
- North Tibet,
- geochemistry,
- geochronology

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References(87)

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Geochronology, Zircon Hf Isotope and Geochemistry of Volcanic Rocks from Shamuluo Formation in Western Banggongco-Nujiang Suture Zone, North Tibet

doi: 10.3799/dqkx.2020.104

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