北澜沧江结合带晚白垩世花岗岩成因及其地球动力学意义

李洪梁; 杨东旭; 田尤; 李元灵; 王灵; 李宝幸

doi:10.3799/dqkx.2022.466

Volume 48 Issue 4

Apr. 2023

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Li Hongliang, Yang Dongxu, Tian You, Li Yuanling, Wang Ling, Li Baoxing, 2023. Genesis and Its Geodynamic Significance of Late Cretaceous Granites in North Lancang River Suture. Earth Science, 48(4): 1330-1350. doi: 10.3799/dqkx.2022.466

Citation:

Li Hongliang, Yang Dongxu, Tian You, Li Yuanling, Wang Ling, Li Baoxing, 2023. Genesis and Its Geodynamic Significance of Late Cretaceous Granites in North Lancang River Suture. Earth Science, 48(4): 1330-1350. doi: 10.3799/dqkx.2022.466

Citation:

Li Hongliang, Yang Dongxu, Tian You, Li Yuanling, Wang Ling, Li Baoxing, 2023. Genesis and Its Geodynamic Significance of Late Cretaceous Granites in North Lancang River Suture. Earth Science, 48(4): 1330-1350. doi: 10.3799/dqkx.2022.466

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Genesis and Its Geodynamic Significance of Late Cretaceous Granites in North Lancang River Suture

doi: 10.3799/dqkx.2022.466

1.
Institute of Prospecting Technology, Chinese Academy of Geological Sciences, Chengdu 611734, China
2.
No. 208 Geological Team, Bureau of Geological and Mineral Exploration and Development, Chongqing 401121, China
3.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2022-05-31
Publish Date: 2023-04-25

Abstract

Abstract

Studies on granites in the North Lancang River suture were mainly focused on the Indosinian period, but little on the Cretaceous. Based on the field geological survey, the petrogeochemistry, zircon U-Pb dating and Hf isotope of the newly discovered granites in Leiwuqi area, East Tibet are carried out. The results show that the diagenetic ages of the two granites are 75.06±0.82 Ma (MSWD=1.90) and 74.89±0.65 Ma (MSWD=1.05), respectively, which are the products of Late Cretaceous magmatic activity. The granites contain muscovite (~5%) and are characterized by high SiO₂ (69.07%-69.39%), rich K₂O (5.31%-5.77%) and low Mg^# (0.30-0.33), with A/CNK ratio of 1.11-1.15, and are enriched in large ion lithophile elements (LILE, e.g., Rb, Th, U and Pb) and LREE, depleted in high field strength elements (HFSE, e.g., Ba, Nb, Sr, P and Ti) and HREE, with strong fractionation of light and heavy rare earth elements and significant negative Eu anomaly. These features suggest that the granites belong to the peraluminaceous S-type granite, and the source rocks are metamorphic argillaceous rocks and greywacke. The zircon ε_Hf(t) value of the granite (-4.6 to 1.1) varies widely and are of ancient two-stage Hf isotopic model ages (T_DM2, 1.07-1.43 Ga). Comprehensive analysis shows that the Late Cretaceous granites in the North Lancang River suture were generated by a degree of separation crystallization of parent magma, derived from mantle derived mafic magma formed by the upwelling and decompression melting of asthenosphere materials caused by the delamination of the thickened lithosphere, underplating into the ancient crust, inducing the melting of the ancient crust and mixing with it, which indicates that the orogenic evolution of the Leiwuqi area in East Tibet was in the late orogenic destruction stage during Late Cretaceous.
- S-type granite,
- Late Cretaceous,
- post-collision,
- geochemistry,
- zircon U-Pb dating and Hf isotope,
- North Lancang River suture,
- petrology

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References(123)

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Genesis and Its Geodynamic Significance of Late Cretaceous Granites in North Lancang River Suture

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