Age and protolith characteristics of metamorphic surrounding rock of Chakabeishan pegmatitic lithium-beryllium ore in the northern margin of Qaidam

ZHENG Ying; LI Wufu; ZHANG Xiaoyong; HAN Jie; JIN Xuliang; GOU Mingliang

doi:10.12097/gbc.2023.02.009

2024 Vol. 43, No. 7

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ZHENG Ying, LI Wufu, ZHANG Xiaoyong, HAN Jie, JIN Xuliang, GOU Mingliang. 2024. Age and protolith characteristics of metamorphic surrounding rock of Chakabeishan pegmatitic lithium-beryllium ore in the northern margin of Qaidam. Geological Bulletin of China, 43(7): 1104-1119. doi: 10.12097/gbc.2023.02.009

Citation:

ZHENG Ying, LI Wufu, ZHANG Xiaoyong, HAN Jie, JIN Xuliang, GOU Mingliang. 2024. Age and protolith characteristics of metamorphic surrounding rock of Chakabeishan pegmatitic lithium-beryllium ore in the northern margin of Qaidam. Geological Bulletin of China, 43(7): 1104-1119. doi: 10.12097/gbc.2023.02.009

Age and protolith characteristics of metamorphic surrounding rock of Chakabeishan pegmatitic lithium-beryllium ore in the northern margin of Qaidam

1.
Qinghai Institute of Geological Survey, Xining 810012, Qinghai, China
2.
Key Laboratory of Geological Process and Mineral Resources for Northern Qinghai-Xizang Plateau, Xining 810012, Qinghai, China

More Information

Author Bio: ZHENG Ying，female，born in 1988，master's degree，senior engineer，Engaged in regional geological and mineral survey research；E-mail：619761502@qq.com
Corresponding author: LI Wufu，female，born in 1982，master's degree，Professor senior engineer，Engaged in regional geological and mineral survey research；E-mail：15422504@qq.com。

Received Date: 06 February 2023

Revised Date: 04 May 2023

Publish Date: 15 July 2024

Abstract

Abstract

The Chakabeishan lithium beryllium deposit is located in the west of Nanshan, Qinghai Province. The region is tectonically located in the eastern segment of the Zongwulong Mountain continental margin rift belt. The orebody occurs in the granite pegmatite dike, and the surrounding rock is metamorphic rock assemblage of low amphibole-high green schist facies. The study value of this set of metamorphic rocks as the surrounding rock of lithium beryllium ore body is of great significance for discussing the regularity and prediction of lithium beryllium mineralization in the northern margin of Qaidam. Based on the rock assemblages, the schist formation was identified as the Chakabeishan Schist Formation. Based on zircon cathodoluminescence image characteristics and zircon U−Pb (LA−ICP−MS) dating tests, the formation age was determined to be Nanhuaian—Ordovician. Zircon Hf isotope analysis shows that the ε_Hf(t) values range from −19.62 to −3.07, indicating that the rocks in the source area were partially melted from paleoproterozoic to Neoarchean upper crust. The contents of SiO₂, FeO, TFe₂O₃, and MgO in schist Formation are 61.33% ~ 70.57%, 3.58% ~ 5.13%, 5.2% ~ 7.95% and 1.89% ~ 4.95% respectively. The REE partition curve of chondrites is right-leaning, and the REE curve tends to be flat, with weak europium deficit and light REE enrichment characteristics. High field strength elements such as Th, U, Nd, Zr, Hf, Nb and Ti are enriched in trace elements, while lithophilic elements such as Ba and Sr are depleted. Based on the chronology and geochemistry, the author believes that the Chakabeishan schist was formed in the Neoproterozoic and Early Paleozoic back-arc basin environment. The protolith suffered from weak weathering and denudation, and the chemical composition is stable. It is determined to be argillaceous sandstone, whose material is mainly derived from felsic igneous rocks in the island arc environment. The tectonic setting is a continental island arc, which is consistent with the source area of pegmatite dikes containing lithium beryllium ore.
- Chakabeishan /
- schist /
- detrital zircon /
- zircon U−Pb dating /
- Nanhuaian—Ordovician period /
- tectonic environment

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