Detrital Zircon U-Pb Ages of Liangjiehe Formation in East Guizhou Province and Its Implications for Sturtian Glaciation

被引：0

作者：

Gao Y. ^{[1
]}

Zhang Y. ^{[1
]}

An X. ^{[1
]}

Liu S. ^{[1
]}

Zheng J. ^{[2
]}

Sang Y. ^{[2
]}

机构：

[1] Chengdu Center of China Geological Survey, Chengdu

[2] College of Earth Sciences, Chengdu University of Technology, Chengdu

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2020年 / 45卷 / 08期

关键词：

Detrital zircon; Geochronology; Interglaciation; Jiangkou glaciation; Liangjiehe Formation; Yangtze Block;

D O I：

10.3799/dqkx.2020.153

中图分类号：

学科分类号：

摘要：

The Liangjiehe Formation is the interglacial stratum between Chang'an and Gucheng glaciations in the southeastern Yangtze Block, and the lithology is dominated by detrital sandstone and quartz sandstone. For a better understanding of the temporal and spatial distribution of the Sturtian glacigenic strata in South China, it is important to determine the depositional age of the Liangjiehe Formation. In this study, systematical morphology and zircon U-Pb dating were carried out on detrital zircons from the Liangjiehe Formation in the eastern Guizhou. Most of the detrital zircons are of magmatic origin, and have a main 206Pb/238U age range of 740-900 Ma and minor populations of Paleoproterozoic-Archean ages, with peaks at ~760 Ma, ~780 Ma, ~800 Ma, ~820 Ma and 880-900 Ma. The youngest single-grain zircon obtained at the bottom of the Liangjiehe Formation gives the age of 708±15 Ma, and the youngest single-grain zircon from the upper part gives the age of 703±22 Ma. Taking into account the topmost age ~690 Ma of the contemporary stratum (Xieshuihe Formation), it is suggested that the Liangjiehe Formation was most likely deposited at 708-690 Ma. The detrital zircon U-Pb age spectrum of the Liangjiehe Formation records the Neoproterozoic episodic tectonic-magmatic events and the information for the early crustal evolution of Yangtze Block. The zircon morphology indicates that the provenances of the Liangjiehe Formation may include the underlying Neoproterozoic magmatic and sedimentary strata, and the basement rocks from the northwestern and southwestern Yangtze Block. The detrital zircon U-Pb dating at the bottom of the Liangjiehe Formation constrained the interglacial deposition later than ~708 Ma. Considering that the stratigraphic distribution in the early Nanhua period is partly controlled by basin tectonic activities, the Chang'an glacial deposit may exist locally in eastern Guizhou. © 2020, Editorial Department of Earth Science. All right reserved.

引用

页码：3070 / 3081

页数：11

共 36 条

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