西藏东南缘早二叠世长英质凝灰岩锆石U-b年龄和Hf同位素特征

麦源君; 朱利东; 杨文光; 解龙; 童霞; 郝金月; 钟摇

doi:10.3799/dqkx.2020.397

Volume 46 Issue 11

Nov. 2021

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Article Navigation > Earth Science > 2021 > 46(11): 3880-3891

Mai Yuanjun, Zhu Lidong, Yang Wenguang, Xie Long, Tong Xia, Hao Jinyue, Zhong Yao, 2021. Zircon U-Pb and Hf Isotopic Composition of Permian Felsic Tuffs in Southeastern Margin of Lhasa, Tibet. Earth Science, 46(11): 3880-3891. doi: 10.3799/dqkx.2020.397

Citation:

Mai Yuanjun, Zhu Lidong, Yang Wenguang, Xie Long, Tong Xia, Hao Jinyue, Zhong Yao, 2021. Zircon U-Pb and Hf Isotopic Composition of Permian Felsic Tuffs in Southeastern Margin of Lhasa, Tibet. Earth Science, 46(11): 3880-3891. doi: 10.3799/dqkx.2020.397

Citation:

Mai Yuanjun, Zhu Lidong, Yang Wenguang, Xie Long, Tong Xia, Hao Jinyue, Zhong Yao, 2021. Zircon U-Pb and Hf Isotopic Composition of Permian Felsic Tuffs in Southeastern Margin of Lhasa, Tibet. Earth Science, 46(11): 3880-3891. doi: 10.3799/dqkx.2020.397

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Zircon U-Pb and Hf Isotopic Composition of Permian Felsic Tuffs in Southeastern Margin of Lhasa, Tibet

doi: 10.3799/dqkx.2020.397

Mai Yuanjun^{1
,
,},
Zhu Lidong^{1
,
,
,},
Yang Wenguang¹,
Xie Long¹,
Tong Xia¹,
Hao Jinyue²,
Zhong Yao¹

1.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
2.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2020-11-21
Available Online: 2021-12-04
Publish Date: 2021-11-30

Abstract

Abstract

The Tangjia-Sumdo Paleo-Tethys accretionary complex belt, recorded in the southeastern margin of Lhasa, provides new evidence for the understanding of the Late Paleozoic tectonic evolution of the Paleo-Tethys Ocean. In this paper, it reports new data for the felsic tuff in this accretionary complex belt, including petrology, major and trace element compositions, zircon U-Pb age, and in-situ Hf isotopic compositions. U-Pb zircon dating indicates that the timing of eruption of the Chongni tuffs was ca. 278-275 Ma. They are characterized by relatively high SiO₂ (63.47%-72.65%), and high Al₂O₃ (14.53%-21.31%), relatively low K₂O (1.30%-2.51%), TiO₂ (0.50%-1.17%), MgO (0.92%-2.00%), and Mg^# (19.9-34.2). These tuffs exhibit LILE enrichment and HFSE depletetion. The zircons participating in the weighted age calculation have positive ε_Hf(t) values of +10.2 to +14.4 and relatively young zircon Hf crustal model ages (T_DM^c=351-621 Ma). It agrees that Chongni tuffs were derived from the partial melting of the juvenile crust under the background of the northward subduction of the Tangjia-Sumdo Paleo-Tethys Ocean slab, and the beginning time of the ocean slab subduction is not later than Early Permian, before which there were the events that crust grew in the southeastern margin of Lhasa.
- Early Permian,
- Lhasa terrane,
- Hf isotope,
- U-Pb age,
- Tangjia-Sumdo Paleo-Tethys,
- petrology

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References(84)

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