Did Grenvillian Orogeny ever Happen in Tarim Craton? Evidence from Detrital Zircon Chronology

被引：4
|
作者：
Yi Z. [1 ]
Wei G. [2 ]
Guo Z. [1 ]
机构：
[1] School of Earth and Space Sciences, Peking University, Beijing
[2] PetroChina Research Institute of Petroleum Exploration & Development, Beijing
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 04期
关键词：
detrital zircon; Grenvillian orogen; Neoproterozoic; structural geology; Tarim craton;
D O I：
10.3799/dqkx.2022.272
中图分类号：
学科分类号：
摘要：
In recent years, it has been suggested that a Grenvillian orogenic belt developed in the Tarim Craton. However, associated magmatic and metamorphic evidence is absence. An orogeny provides massive detritus for the nearby basin, and hence would be reflected in the detrital zircon records.In this study, seven Neoproterozoic sandstone samples were obtained in the Tieklik area (Southwest Tarim) and the Quruqtagh area (Northeast Tarim), and studied through detrital zircon U-Pb dating. A total of 1 135 detrital zircon age data were obtained. In the Nanhua System, there are tillites in the Bolong Formation and Yutang Formation in the Southwest Tarim. The maximum depositional ages constrained by the detrital zircon records are 693.2±3.3 Ma and 642.7±4.4 Ma, respectively. Therefore, the Bolong tillite and the Yutang tillite can be correlated with the Sturtian glaciation and the Marinoan glaciation, respectively. Besides, previously published data were integrated to form a complete detrital zircon U-Pb age database of the Neoproterozoic in the Tarim craton. It shows that the detrital zircon ages are mainly distributed in the ranges of 700-900 Ma and 1 800-2 100 Ma, which is inconsistent with the age range of 980-1 250 Ma for the Grenvillian orogeny. Besides, the provenances of the Neoproterozoic clastic rocks in the three outcrop areas, i.e., the Aksu, Quruqtagh and Tieklik areas, are significantly different. It indicates that there were more than one source regions during the Nanhua-Sinian periods, which contradicts the hypothesis of a large-scale orogen across the craton. In brief, this study concludes from the detrital zircon records that no Grenvillian collisional orogen developed in the Tarim craton. © 2023 China University of Geosciences. All rights reserved.
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页码：1405 / 1420
页数：15
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