Genesis of Late Triassic Harasu porphyritic syenogranite in Zalantun area, Inner Mongolia: Zircon U-Pb age, Hf isotope and geochemical evidence

HU Peng; DUAN Ming; XIONG Jinlian; ZENG Wei; LIU Xing; YAN Guoqiang; WEI Jialin

doi:10.12097/j.issn.1671-2552.2023.12.007

2023 Vol. 42, No. 12

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HU Peng, DUAN Ming, XIONG Jinlian, ZENG Wei, LIU Xing, YAN Guoqiang, WEI Jialin. 2023. Genesis of Late Triassic Harasu porphyritic syenogranite in Zalantun area, Inner Mongolia: Zircon U-Pb age, Hf isotope and geochemical evidence. Geological Bulletin of China, 42(12): 2109-2120. doi: 10.12097/j.issn.1671-2552.2023.12.007

Citation:

HU Peng, DUAN Ming, XIONG Jinlian, ZENG Wei, LIU Xing, YAN Guoqiang, WEI Jialin. 2023. Genesis of Late Triassic Harasu porphyritic syenogranite in Zalantun area, Inner Mongolia: Zircon U-Pb age, Hf isotope and geochemical evidence. Geological Bulletin of China, 42(12): 2109-2120. doi: 10.12097/j.issn.1671-2552.2023.12.007

Genesis of Late Triassic Harasu porphyritic syenogranite in Zalantun area, Inner Mongolia: Zircon U-Pb age, Hf isotope and geochemical evidence

1.
Tianjin Center, China Geological Survey(North China Center for Geoscience Innovation), Tianjin 300170, China
2.
National Marine Data and Information Service, Tianjin 300171, China
3.
China University of Geosciences, Wuhan 430074, Hubei, China
4.
Jilin University, Changchun 130061, Jilin, China

More Information

Corresponding author: DUAN Ming, 279549801@qq.com

Received Date: 29 December 2021

Revised Date: 20 April 2022

Publish Date: 15 December 2023

Abstract

Abstract

In this paper, the geochronology, geochemistry and Hf isotopic composition of the Harasu porphyritic syenogranite in Zalantun, Inner Mongolia were studied.LA-ICP-MS zircon dating indicates that the Harasu porphyritic syenogranite was emplaced during the Late Triassic(213.17±0.93 Ma).The mineral assemblage is mainly composed of quartz, alkaline feldspar and plagioclase.The Harasu porphyritic syenogranite is characterized by high SiO₂(72.56%~74.36%), K₂O(4.74%~5.49%), low MgO(0.12%~0.34%), CaO(0.54%~0.95%), TiO₂(0.19%~0.29%) and P₂O₅(0.042%~0.053%), A/CNK=1~1.05, < 1.1.It is strongly depleted in Ba, Sr, Eu, P and Ti, showing the geochemical characteristics of aluminous A-type granite.The Harassu A-type granites have high ε_Hf(t) values(+9.08~+15.3), which may due to the partial melting of new meso-basic crustal materials.The Harasu A-type granite is recognized as the product of a post-orogenic tectonic.The crust in Zalantun area was thickened and transformed into a post orogenic extension mechanism, which may be affected by the remote effect of the closure of the Paleo-Asian Ocean, and then the Late Triassic Harasu porphyritic syenogranite in Zalantun area was formed.
- A-type granite /
- Late Triassic /
- geochemistry /
- zircon U-Pb dating /
- Zalantun, Inner Mongolia /
- geological survey engineering

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References

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