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© 2024. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

The northeastern Sichuan area in the northern Yangtze margin has unique Ediacaran geological records, especially the Doushantuo Formation (DST), and become a hot research area in recent years. However, the Cryogenian-Ediacaran (C-E) boundary has not been precisely identified, which restricts the in-depth study of geological information during this crucial transitional period and is unfavorable for a systematic and complete understanding of the Yangtze Block and even the global paleogeographic pattern. This study conducted stratigraphy, sedimentology, and chronostratigraphy to establish the stratigraphic framework and sedimentary evolution of the C-E transition strata in northeastern Sichuan. The results showed that the Ediacaran sediments, without the cap dolomite, unconformably overlaid the Cryogenian sediments in the studied area. The Member II of the DST, characterized by 50-160 m of red-green sandstone (approximately equivalent to the original Chengkou "Guanyinya Formation"), directly overlaid the Cryogenian sediments and displayed a 623 ± 2.3 Ma maximum depositional age from the detrital zircon U-Pb dating. Regional stratigraphic correlations indicate that the C-E transition strata in northeastern Sichuan had a consistent lithological association and sedimentary sequence characteristics but differed from the Three Gorges. Typically, the upper Nantuo massive glacial diamictites transition to the icebergs rafted lonestone-bearing mudstones at the top, then change upward to DST barrier coast sandstones. The proposed DST of the northeastern Sichuan Basin was divided into three lithostratigraphic members without the regional Member I cap dolomite: (i) Member II purple-red, gray-green sandstone strata, (ii) Member III black mudstone strata, and (iii) Member IV P-Mn bearing strata. During the C-E transition, the study area experienced (i) the global deglaciation stage in the terminal Marinoan glaciation and (ii) the filling-leveling up stage with clastic rocks in the early Ediacaran. Overall, the early Ediacaran of northeastern Sichuan succeeded the paleogeographic features of the late Cryogenian.

Details

Title
Stratigraphic framework and sedimentary evolution during the Cryogenian-Ediacaran transition in northeastern Sichuan Basin, South China
Author
Zhang, Yi 1 ; Kuang, Hong-Wei 1 ; Liu, Yong-Qing 1 ; Shi, Qiang 2 ; Wang, Dong-Ge 2 ; Qi, Ke-Ning; Wang, Yu-Chong; Qiao, Da-Wei; Chen, Xiao-Shuai; Wu, Li-Zhi; Tian, Meng; Chen, Long; Wei, Yi; Song, Liao-Yuan; Li, Jian; Wu, Zi-Gang; Liu, Yun-Qian; Liu, Xuan-Chun; Chen, An-Qing; Liao, Zhi-Wei

 Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China 
 No. 205 Geological Team, Chongqing Bureau of Geology and Minerals Exploration, Chongqing, 401121, China 
Pages
823-835
Section
Original Paper
Publication year
2024
Publication date
Apr 2024
Publisher
KeAi Publishing Communications Ltd
ISSN
16725107
e-ISSN
19958226
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3073676830
Copyright
© 2024. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.