首页|Stratigraphic framework and sedimentary evolution during the Cryogenian-Ediacaran transition in northeastern Sichuan Basin,South China

Stratigraphic framework and sedimentary evolution during the Cryogenian-Ediacaran transition in northeastern Sichuan Basin,South China

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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 over-laid 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 north-eastern 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 glaci-ation 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.

Marinoan glaciationDoushantuo formationCap dolomiteDeglacial and coastal depositsDetrital zircon U-Pb dating

Yi Zhang、Hong-Wei Kuang、Yong-Qing Liu、Qiang Shi、Dong-Ge Wang、Ke-Ning Qi、Yu-Chong Wang、Da-Wei Qiao、Xiao-Shuai Chen、Li-Zhi Wu、Meng Tian、Long Chen、Yi Wei、Liao-Yuan Song、Jian Li、Zi-Gang Wu、Yun-Qian Liu、Xuan-Chun Liu、An-Qing Chen、Zhi-Wei Liao

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Institute of Geology,Chinese Academy of Geological Sciences,Beijing,100037,China

State Key Laboratory of Coal Mine Disaster Dynamics and Control,School of Resources and Safety Engineering,Chongqing University,Chongqing,400044,China

No.205 Geological Team,Chongqing Bureau of Geology and Minerals Exploration,Chongqing,401121,China

Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China

State Key Laboratory of Coal Mine Disaster Dynamics and Control,School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China

Chongqing Institute of Geological Survey,Chongqing 401122,China

Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources,Chengdu University of Technology,Chengdu,610059,Sichuan,China

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China Geological Survey国家自然科学基金国家自然科学基金国家自然科学基金重庆市基础科学与前沿技术研究专项Open Fund of Key Laboratory of Deeptime Geography and Environment Reconstruction and Applications of Ministry of Natural Resourc

DD20221649U19B60034207213542172119cstc2021jcyjmsxmX0023DGERA 20211105

2024

10.1016/j.petsci.2023.12.011

石油科学(英文版)
中国石油大学（北京）

石油科学(英文版)

EI
影响因子：0.88
ISSN：1672-5107
年,卷(期)：2024.21(2)
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