Petrogenesis for Neoproterozoic granitic rocks in Altyn Qiemo-Ruoqiang area, and implications for determining the timing of Rodinia supercontinent's convergence

JIN Shengkai; XIE Zhiyuan; LI Mingjun; LIU Bo; FENG Yongcai

doi:10.12097/j.issn.1671-2552.2023.11.009

2023 Vol. 42, No. 11

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JIN Shengkai, XIE Zhiyuan, LI Mingjun, LIU Bo, FENG Yongcai. 2023. Petrogenesis for Neoproterozoic granitic rocks in Altyn Qiemo-Ruoqiang area, and implications for determining the timing of Rodinia supercontinent's convergence. Geological Bulletin of China, 42(11): 1909-1923. doi: 10.12097/j.issn.1671-2552.2023.11.009

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JIN Shengkai, XIE Zhiyuan, LI Mingjun, LIU Bo, FENG Yongcai. 2023. Petrogenesis for Neoproterozoic granitic rocks in Altyn Qiemo-Ruoqiang area, and implications for determining the timing of Rodinia supercontinent's convergence. Geological Bulletin of China, 42(11): 1909-1923. doi: 10.12097/j.issn.1671-2552.2023.11.009

Petrogenesis for Neoproterozoic granitic rocks in Altyn Qiemo-Ruoqiang area, and implications for determining the timing of Rodinia supercontinent's convergence

1.
Langfang Comprehensive Natural Resources Survey Center, China Geological Survey, Langfang 065000, Hebei, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
3.
Yantai Institute of Coastal Zone Geological Survey, China Geological Survey, Yantai 264010, Shandong, China

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Corresponding author: XIE Zhiyuan, 939815288@qq.com

Received Date: 13 July 2021

Revised Date: 06 April 2022

Publish Date: 15 November 2023

Abstract

Abstract

The Neoproterozoic granitic magma activity was widespread in the Altyn orogenic belt, with formation ages around 800~1000 Ma.These magmatic events are thought to be associated with the convergence of the Rodinia supercontinent.Therefore, the study of Neoproterozoic granitic magma is of great significance for gaining insights into the evolution processes of the Altyn orogenic belt.In this study, we present precise results from petrological, geochronological and geochemical investigations of the granitic rocks from the Qiemo-Ruoqiang area in the southern Altyn block.Our findings indicate that: ①In comparison to the enrichment of light rare earth elements(LREE), heavy rare earth elements(HREE)exhibit a pronounced right-leaning characteristic, accompanied by a distinct negative Eu anomaly(δEu=0.14~0.6).These rocks are enriched in large ion lithophile elements like Th, U, and K, while simultaneously showing depletion in high field strength elements such as Ba, Ti, Nb, Ta, and Sr.②Zircon U-Pb ages fall within the range of approximately 899 Ma to 915 Ma.Comprehensive studies have shown that the three categories of granitic rocks in the Qimo-Ruoqiang region were formed in a syn-collision tectonic environment, which were the products of subduction and collision between plates during the convergence stage of the Rodinia supercontinent.
- Altyn orogenic belt /
- granitic rocks /
- U-Pb geochronology /
- Rodinia supercontinent /
- geological survey engineering

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