GEOCHRONOLOGY AND GEOCHEMISTRY OF THE GRANITE PORPHYRY IN TEGEWULA AREA OF XIN BARAG YOUQI, INNER MONGOLIA

MA Qiao-yan; SHAO Yong-xu; CAO Lei; QIU Guang-dong

doi:10.13686/j.cnki.dzyzy.2023.04.001

2023 Vol. 32, No. 4

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Article navigation > Geology and Resources > 2023 > 32(4): 373-382

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MA Qiao-yan, SHAO Yong-xu, CAO Lei, QIU Guang-dong. GEOCHRONOLOGY AND GEOCHEMISTRY OF THE GRANITE PORPHYRY IN TEGEWULA AREA OF XIN BARAG YOUQI, INNER MONGOLIA[J]. Geology and Resources, 2023, 32(4): 373-382. doi: 10.13686/j.cnki.dzyzy.2023.04.001

Citation:

MA Qiao-yan, SHAO Yong-xu, CAO Lei, QIU Guang-dong. GEOCHRONOLOGY AND GEOCHEMISTRY OF THE GRANITE PORPHYRY IN TEGEWULA AREA OF XIN BARAG YOUQI, INNER MONGOLIA[J]. Geology and Resources, 2023, 32(4): 373-382. doi: 10.13686/j.cnki.dzyzy.2023.04.001

GEOCHRONOLOGY AND GEOCHEMISTRY OF THE GRANITE PORPHYRY IN TEGEWULA AREA OF XIN BARAG YOUQI, INNER MONGOLIA

Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting/Inner Mongolia Institute of Geological Survey, Hohhot 010020, China

Received Date: 12 April 2022

Revised Date: 16 August 2022

Publish Date: 25 August 2023

Abstract

Abstract

The study on the petrology, geochemistry, genesis and tectonic environment of the granite porphyry in Tegewula area of Daxinganling Mountains show that the age of the rock is 145.9±1.2 Ma, formed in the late Early Cretaceous. The granite porphyry is rich in silicon, alkali and aluminum, belonging to the quasi aluminous-aluminous high-potassium calc-alkaline series. The mineral assemblage and geochemical characteristics show that the granite porphyry is highly differentiated I-type granite, with enriched LILEs (Rb, Th and U) and LREEs (La, Ce and Pr), and obvious negative Eu anomaly, indicating the geochemical characteristics of crust-derived magma or magma mixed with crustal materials. It is concluded that the granite porphyry in Tegewula area was formed in a post-orogenic extensional environment, which may be related to the delamination of thickened continental crust after the closure of Mongolia-Okhotsk suture zone.
- granite porphyry /
- zircon U-Pb age /
- geochemistry /
- lithogenesis /
- tectonic setting /
- Tegewula area /
- Inner Mongolia

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References

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