Neoproterozoic glaciations in Yecheng area, southwestern margin of the Tarim Basin

doi:10.13745/j.esf.sf.2021.6.30

Abstract

Abstract:

The Neoproterozoic glacial events record significant geological information of the Snowball Earth. In the Tarim Basin Neoproterozoic outcrops are well developed along the basin margin, making it an ideal research base for studying Neoproterozoic glaciations. The age of the Neoproterozoic diamictite along the northeastern margin of the basin is constrained from a series of well developed Neoproterozoic volcanic rocks in the Quruqtagh area; however, such constraints are lacking for other basin margin areas due to infrequent reporting of chronology data, which leads to disagreements when comparing glacial events. This project selects the minimally studied Neoproterozoic diamictite along the southwestern margin of the Tarim Basin to perform a multidisciplinary, comprehensive analysis of the mineral's petrology, isotopic chronology and lithogeochemistry of the deposit so as to determine its glacial deposition characteristics and deposition time as well as to better understand the paleoclimatic weathering conditions. The Nanhua Bolong and Sinian Yutang Formations with low CIA (chemical index of alteration) values represent two distinct episodes of Neoproterozoic glaciations. Detrital zircon U-Pb chronology of the glacial deposits and adjacent beds indicate the starting time of the Bolong glaciation is later than (710±13) Ma and corresponds to the global Sturtian glaciation, and the starting time of the Yutang glaciation is no earlier than (656±18) Ma while its termination time can be constrained by the age of the top boundary of the Nanhuan System (635 Ma) or the detrital zircon U-Pb age of the overlying Sinian System Kulkark Formation (634±9) Ma, which corresponds to the global Marinoan glaciation.

Key words: diamictite, isotopic geochronology, snowball Earth, Neoproterozoic, Tarim Basin

CLC Number:

LI Wangpeng, LI Huili, WANG Yi, LIU Shaofeng, ZHANG Zhongpei, YANG Weili, CAI Xiyao, QIAN Tao, LI Xiaojian. Neoproterozoic glaciations in Yecheng area, southwestern margin of the Tarim Basin[J]. Earth Science Frontiers, 2022, 29(3): 356-380.

Figures/Tables 12

Fig.1 Regional geological map of the Yecheng region

Fig.2 Stratigraphic columnar section of the Neoproterozoic and related CIA values for the Yecheng area

Fig.3 Field photos of Neoproterozoic outcrops in the Yecheng area

Table 1 U-Pb dating results of detrital zircon from siltstone in the Bolong Formation ( sample S17 YT200)

Table 2 U-Pb dating results of detrital zircon from sandstone in the Bolong Formation (sample S17 YT205)

Table 3 U-Pb dating results of detrital zircon from sandstone in the Yutang Formation (sample S17Y T210)

Table 4 U-Pb dating results of detrital zircon from siltstone in the Kurkak Formation ( sample S17 YT207)

Fig.4 Representative cathodoluminescence images of detrital zircons from the Neoproterozoic outcrops in Yecheng area

Fig.5 Detrital zircon U-Pb concordia diagrams and age spectra for the Neoproterozoic outcrops in Yecheng area

Table 5 Chemical analysis of total rock principal component and values of CIA and ICV

Fig.6 A-CN-K diagram for the Neoproterozoic outcrops in Yecheng area. Adapted from [36].

Table 6 Comparison of Neoproterozoic glaciations

中国主要地区		Gaskies冰期 (583.7582.1 Ma)	Marinoan冰期 (651635 Ma)	Sturtian冰期 (718660 Ma)	Kaigas冰期 (757741 Ma)
塔里木盆地	库鲁克塔格地区^{[15⇓⇓-18,64]}	汉格尔乔克冰期 (615±6)(541±1) Ma	特瑞爱肯冰期 (642±8)(617±6) Ma	阿勒通沟冰期 (725±7)(655±4) Ma	贝义西冰期 (740±7)(732±7) Ma
	阿克苏地区^[10,21,70]		尤尔美那克冰期 (719±7)(615±5) Ma	巧恩布拉克冰期 (727±8)?Ma
	叶城地区(本文)		雨塘冰期 (656±18)635 Ma	波龙冰期 (710±13)?Ma
华南地区^{[60⇓⇓-63,72⇓-74]}			南沱冰期 (655±4)635 Ma	江口冰期 (716±3)(663±4) Ma
华北地区		罗圈冰期

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