中亚造山带东南缘三叠纪解放营子岩体全岩Sr⁃Nd⁃Li同位素特征及成因

吴迪迪; 李舢

doi:10.3799/dqkx.2021.199

Volume 47 Issue 9

Sep. 2022

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Article Navigation > Earth Science > 2022 > 47(9): 3301-3315

Wu Didi, Li Shan, 2022. The Whole⁃Rock Sr⁃Nd⁃Li Isotopic Characteristics and Genesis of the Triassic Jiefangyingzi Pluton in the Southeastern Margin of the Central Asian Orogenic Belt. Earth Science, 47(9): 3301-3315. doi: 10.3799/dqkx.2021.199

Citation:

Wu Didi, Li Shan, 2022. The Whole⁃Rock Sr⁃Nd⁃Li Isotopic Characteristics and Genesis of the Triassic Jiefangyingzi Pluton in the Southeastern Margin of the Central Asian Orogenic Belt. Earth Science, 47(9): 3301-3315. doi: 10.3799/dqkx.2021.199

Citation:

Wu Didi, Li Shan, 2022. The Whole⁃Rock Sr⁃Nd⁃Li Isotopic Characteristics and Genesis of the Triassic Jiefangyingzi Pluton in the Southeastern Margin of the Central Asian Orogenic Belt. Earth Science, 47(9): 3301-3315. doi: 10.3799/dqkx.2021.199

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The Whole⁃Rock Sr⁃Nd⁃Li Isotopic Characteristics and Genesis of the Triassic Jiefangyingzi Pluton in the Southeastern Margin of the Central Asian Orogenic Belt

doi: 10.3799/dqkx.2021.199

Wu Didi^,,
Li Shan^{,
,}

Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2021-11-01
Publish Date: 2022-09-25

Abstract

Abstract

The Triassic granites in the southeastern margin of the Central Asian Orogenic Belt are of diverse types and complex genesis. In order to study their provenance and formation setting, we selected monzogranite, gneissic porphyritic granite and diorite porphyrite in the different locations of the Jiefangyingzi pluton, and performed the whole-rock elemental and Sr-Nd-Li isotope analyses, and zircon geochronology. Zircon U-Pb geochronology results show that the different rock types of the Jiefangyingzi pluton were similarly formed in the Late Triassic (234-226 Ma). Geochemical characteristics show that all of them are I-type granites undergoing different degrees of fractionation crystallization. Slightly negative to positive ɛ_Nd(t) values (-3.9-+1.5) indicate that they derived from juvenile materials with the addition of ancient crustal materials to varying degrees. The whole-rock Li isotopic characteristics of pluton in this region are reported for the first time. The range of δ⁷Li value is +1.1- +6.6‰ with an average value of +3.37‰, similar to the average value of upper mantle, indicating that there is a significant contribution of mantle-derived components. Combined with regional geology, the Jiefangyingzi pluton was formed in the post-orogenic extension stage after the closure of the Paleo-Asian Ocean. Decompression melting induced the partial melting of the juvenile mantle-derived components without obvious water-rock interaction related to the early subduction process.
- Southeast margin of Central Asian Orogenic Belt,
- Triassic,
- post-orogeny,
- Li isotope,
- geochemistry

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The Whole⁃Rock Sr⁃Nd⁃Li Isotopic Characteristics and Genesis of the Triassic Jiefangyingzi Pluton in the Southeastern Margin of the Central Asian Orogenic Belt

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