LA-ICP-MS zircon U-Pb ages of the granites from Mashan of Inner Mongolia and their geological significances

YI Pengfei; LI Ning; GAO Feng; FENG Weihua; TANG Li; GAO Yunpeng; LI Qi; LIU Wei; SONG Deyun

doi:10.12097/gbc.dztb-36-2-3-331

Geological Bulletin of China > 2017 > 36(2-3): 331-341. > DOI: 10.12097/gbc.dztb-36-2-3-331

YI Pengfei, LI Ning, GAO Feng, FENG Weihua, TANG Li, GAO Yunpeng, LI Qi, LIU Wei, SONG Deyun. 2017: LA-ICP-MS zircon U-Pb ages of the granites from Mashan of Inner Mongolia and their geological significances. Geological Bulletin of China, 36(2-3): 331-341. DOI: 10.12097/gbc.dztb-36-2-3-331

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LA-ICP-MS zircon U-Pb ages of the granites from Mashan of Inner Mongolia and their geological significances

1.
Shaanxi Center of Geological Survey, Xi'an 710046, Shaanxi, China
2.
Shaanxi Nuclear Industry Geology Surveying Institute, Xi'an 710046, Shaanxi, China

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Received Date: January 26, 2016
Revised Date: May 04, 2016
Available Online: August 15, 2023

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Abstract

Abstract

This paper reports LA-ICP-MS zircon U-Pb ages and geochemistry of the granite in Mashan, east of the southern Beishan, Inner Mongolia, with the purpose of constraining its formation age and petrogenesis. The results show that the granitic body mainly consists of granodiorite which belongs to middle-K calc-alkaline series with metaluminous-peraluminous characteristics and high content of SiO₂(64.85%~79.17%), Na₂O+K₂O (5.13%~6.62%) and Na₂O/K₂O>1. In addition, the granite invariably exhibits relatively gentle light rare earth elements (LREE) enrichment with flat heavy rare earth element (HREE) and weak negative Eu anomalies (δEu=0.65~0.91) in the chondrite-normalized REE patterns, depletion of Ba, Nb, Ta, P, Ti and enrichment of Rb, Th, U, K in the spidergram. The LA-ICP-MS zircon U-Pb age of the granite is 281.8±3.2Ma. Based on regional geology, the above characteristics indicate that the Mashan granite was the mixing product of crustal and mantle derived magmas and was formed under the tectonic setting of post-collisional extension in Early Permian. This implies that the east of southern Beishan Mountain turned to the stage of rift in post-collisional extensional period during Early Permian.
- Inner Mongolia,
- southern Beishan Mountain,
- granite,
- LA-ICP-MS zircon U-Pb age,
- post-collisional extensional period,
- Mashan Mountain

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LA-ICP-MS zircon U-Pb ages of the granites from Mashan of Inner Mongolia and their geological significances

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