Early Paleozoic tectonic framework of the Yidun Terrane, eastern Tibetan Plateau: Constraints from detrital zircon U-Pb-Hf isotopic compositions

被引：0

作者：

Tian Z. ^{[1
]}

Leng C. ^{[2
,3
]}

Guo J. ^{[4
]}

Zhang X. ^{[1
]}

Tian F. ^{[5
]}

Ma R. ^{[1
]}

机构：

[1] State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guizhou, Guiyang

[2] State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Jiangxi, Nanchang

[3] School of Earth Sciences, East China University of Technology, Jiangxi, Nanchang

[4] Suzhou Institute of Economics and Trade, Jiangsu, Suzhou

[5] Yejin Geological Team of Hubei Geological Bureau, Hubei, Shiyan

来源：

Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 04期

关键词：

detrital zircon; Qiasi Group; sedimentary provenance; tectonic evolution; Yidun terrane;

D O I：

10.19762/j.cnki.dizhixuebao.2023222

中图分类号：

学科分类号：

摘要：

The Yidun Terrane, located in the eastern Tibetan Plateau, is a key area to study the tectonic evolution of the Tibetan Plateau and the Paleo-Tethys. To date, its palcogcographic position and possible tectonic evolution during the early Paleozoic remain unclear. Detrital zircons from siliciclastic rocks record a wealth of information about their source region and have been widely used to unravel sedimentary provenance and palcogcographic construction. In this study, we conducted detrital zircon in-situ U-Pb dating and Hf isotope analysis of three lower Paleozoic meta-sedimentary rocks in the terrane. The results show that these samples have multi-peak detrital zircon age patterns, their U-Pb ages are mainly grouped into ca. 2535-2350 Ma, ca. 1000-900 Ma, ca. 890-750 Ma, and ca. 590-520 Ma, and their corresponding eHI(t) values are-8. 8 to 13. 1,-11. 8 to 10. 0,-20. 1 to 12. 6, and-27. 6 to 6. 1, respectively.combining these results with previous studies, we consider that the ca. 2535-2350 Ma and ca. 890-750 Ma detrital zircons were predominantly sourced from the nearby Songpan-Ganze Terrane and South China Block, whereas the ca. 1000-900 Ma and ca. 590-520 Ma detrital zircons were likely derived from the Rayner-Eastern Ghats, Prydz-Darling, and Kuunga orogens in the East Gondwana. By comparing the difference in sedimentary provenance between the lower Paleozoic and Neoproterozoic siliciclastic rocks in the Yidun Terrane, as well as those lower Paleozoic sedimentary rocks in the nearby terranes, we suggest that the Yidun Terrane was probably collagcd to the India Block during late Ediacaran to early Cambrian (ca. 570-520), and became part of the Gondwana supercontinent. In the early Paleozoic, the Yidun Terrane was located on the northern margin of the East Gondwana, adjacent to the Qiangtang and Tcthyan Himalaya terranes. © 2023 Geological Society of China. All rights reserved.

引用

页码：1088 / 1105

页数：17

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