西藏中冈底斯成矿带晚三叠世铍铷稀有金属矿化:独居石U-Pb年代学证据

李应栩; 李光明; 黄永高; 韩飞; 杨青松; 严刚; 张林奎; 魏启荣

doi:10.3799/dqkx.2019.010

Volume 44 Issue 7

Jul. 2019

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Article Navigation > Earth Science > 2019 > 44(7): 2379-2391

Li Yingxu, Li Guangming, Huang Yonggao, Han Fei, Yang Qingsong, Yan Gang, Zhang Linkui, Wei Qirong, 2019. Late Triassic Beryllium and Rubidium Rare Metals Mineralization in the Central Gangdise Metallogenic Belt, Tibet, China: Evidence from Monazite U-Pb Geochronology. Earth Science, 44(7): 2379-2391. doi: 10.3799/dqkx.2019.010

Citation:

Li Yingxu, Li Guangming, Huang Yonggao, Han Fei, Yang Qingsong, Yan Gang, Zhang Linkui, Wei Qirong, 2019. Late Triassic Beryllium and Rubidium Rare Metals Mineralization in the Central Gangdise Metallogenic Belt, Tibet, China: Evidence from Monazite U-Pb Geochronology. Earth Science, 44(7): 2379-2391. doi: 10.3799/dqkx.2019.010

Citation:

Li Yingxu, Li Guangming, Huang Yonggao, Han Fei, Yang Qingsong, Yan Gang, Zhang Linkui, Wei Qirong, 2019. Late Triassic Beryllium and Rubidium Rare Metals Mineralization in the Central Gangdise Metallogenic Belt, Tibet, China: Evidence from Monazite U-Pb Geochronology. Earth Science, 44(7): 2379-2391. doi: 10.3799/dqkx.2019.010

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Late Triassic Beryllium and Rubidium Rare Metals Mineralization in the Central Gangdise Metallogenic Belt, Tibet, China: Evidence from Monazite U-Pb Geochronology

doi: 10.3799/dqkx.2019.010

1.
Chengdu Center, China Geological Survey, Chengdu 610081, China
2.
Sichuan Institute of Geological Survey, Chengdu 610081, China
3.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2018-12-13
Publish Date: 2019-07-15

Abstract

Abstract

Beryllium and rubidium mineralization is newly found in northern Namling, Tibet, China. However, the U-Pb ages are not reliable representation of magmatic emplacement age since U concentration in zircons from the mineralized pegmatitic muscovite monzogranite is too high. LA-ICP-MS is taken on monazites from this pyrogenic rock using 24 μm spot 193 nm laser, yielding reliable age. The weighted average age of ²⁰⁶Pb/²³⁸U is 207.0±0.7 Ma (n=22, MSWD=0.101), and the lower intercepted age is 207.0±0.8 Ma (MSWD=0.107). These ages obtained by LA-ICP-MS analysis show the mineralized pegmatitic muscovite monzogranite emplaced in Late Triassic and later than granodiorite in this region. It may represent an important diagenetic event that has not yet been fully identified in the late stage of Indosinian orogeny in Paleo-Gangdise. This new discovery may expand minerals and deposit types for further regional prospecting in the central Gangdise metallogenic belt. Furthermore, this discovery also has great importance for the re-understanding of the Mesozoic tectonic evolution, magmatic evolution and mineralization in this belt. And further enhances the orogenic and metallogenic theories related to the evolution of multi-island-arc-basin in the Qinghai-Tibet Plateau.
- Gangdise metallogenic belt,
- beryllium-rubidium mineralization,
- Late Triassic,
- monazite U-Pb,
- geochronology

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Late Triassic Beryllium and Rubidium Rare Metals Mineralization in the Central Gangdise Metallogenic Belt, Tibet, China: Evidence from Monazite U-Pb Geochronology

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