Geochemistry, U-Pb dating and Hf isotope characteristics of Mangzhang granite in Tengchong block

WANG Shuo; FANG Yi; TANG Xiaoyuan; DAI Junyao; WANG Mengxu

doi:10.19826/j.cnki.1009-3850.2024.12008

Sedimentary Geology and Tethyan Geology > 2025 > 45(1): 187-199. > DOI: 10.19826/j.cnki.1009-3850.2024.12008

WANG S，FANG Y，TANG X Y，et al.，2025. Geochemistry, U-Pb dating and Hf isotope characteristics of Mangzhang granite in Tengchong block[J]. Sedimentary Geology and Tethyan Geology，45(1)：187−199. DOI: 10.19826/j.cnki.1009-3850.2024.12008

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Geochemistry, U-Pb dating and Hf isotope characteristics of Mangzhang granite in Tengchong block

1.
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
2.
Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Ministry of Natural Resources, Chengdu University of Technology, Chengdu 610059, China

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Received Date: October 19, 2023
Revised Date: January 14, 2024
Accepted Date: February 15, 2024

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Abstract

Abstract

The Tengchong area, situated within the Sanjiang Tethys tectonic belt, exhibits frequent Mesozoic-Cenozoic magmatic activity and a significant presence of granite. This study investigates the petrogenesis and geological significance of Mangzhang granite in the Tengchong block through petrography, whole rock geochemistry, zircon U-Pb chronology, and Hf isotope analyses. The results show that the main types of rocks in this area are syenite granite with high SiO₂ contents (from 74.41% to 76.55%) and high potassium abundances (K₂O/Na₂O ratio is greater than 1), peraluminous (A/CNK value varies from 1.34 to 1.48), and belong to S-type granite. Eu and Sr are strongly negative anomalies, Rb and Pb are obviously enriched. At the same time, in the Al₂O₃/(MgO+FeO)−CaO/(MgO+FeO) diagram of Paleogene granite in the Mangzhang area, the samples fall in the metamorphic argillaceous rocks, metamorphic gritstone, and clay-rich source rocks. Zircon ε_Hf(t) values in this study range from －9.14 to －7.73, corresponding to a two-stage model age (t_DM2) of 1699–1613 Ma. The weighted average age of zircon U-Pb is (49.81±0.35) Ma, indicating that the magma emplacement time belongs to the early Eocene. The above characteristics suggest that the granite in this area may be the product of partial melting of the Mesoproterozoic metamorphic basement, which is derived from the ancient clay-rich metamorphic argillaceous rocks and some metamorphic greywackes. Combined with previous research results, it is believed that the syenite granite in the study area, as well as the 60–50 Ma and 50–40 Ma magmatic rocks that widely developed in the Lhasa block formed in the same collision environment, which indicating that the Eocene granite with the characteristics of the same collision in Tengchong is a response to the subduction and collision between the Indian plate and Tengchong-Lhasa block in this period.
- granitoid,
- zircon U−Pb dating,
- geochemistry,
- zircon Hf isotope,
- Tengchong block

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References (71)

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