Sedimentary characteristics of the Cryogenian Nantuo Formation and stratigraphic attribution of red beds in central Yunnan, southwestern margin of Yangtze Craton
QI Kening1,2, KUANG Hongwei1, LIU Yongqing1, PENG Nan1, WANG Yuchong1,3, CHEN Xiaoshuai1
1 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China; 2 School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China; 3 College of Geosciences and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China
Abstract In the central Yunnan region of the Yangtze Craton,the “red beds” that develop in the transitional section between the Nantuo Formation and the Doushantuo Formation of the Neoproterozoic,are still debated among scholars. This study carried out detailed stratigraphic and sedimentological studies on the Nantuo Formation in the Lunacun and Feidatian sections in the central Yunnan region. The sections were located on the southwestern margin of the Yangtze craton. The conglomerate member and its overlying red mudstone member of the Nantuo Formation exhibit typical glacial sedimentary features such as striae,dropstone,and rhythmic laminae,base on which,four sedimentary subfacies can be divided,i.e.,subglacial lag,periglacial channel,pre-glacial delta front,and pre-glacial shoreline subfacies,reflecting different stages of glaciation. The youngest detrital zircon age at the top of the red mudstone is 636Ma,indicating that the deposition time of the top of the purple-red fine sandstone in the upper member of the Nantuo Formation may be later than 636Ma. The regional stratigraphic comparison reveals that the spatial distribution of the conglomerate and mudstone members of the Nantuo Formation in central Yunnan is stable;it represents accumulation of conglomerates under glacier ice,transitioning upwards to the conglomerates of periglacial river channels,and then upwards to the mudstones and fine sandstone of the pre-glacial delta front and the pre-glacial shoreline,exhibiting a pattern of gradual melting of glaciers and marine invasion. In summary,this study suggests that the Nantuo Formation should be divided into two parts,with the lower member consisting of conglomerate and the upper member consisting of purple-red mudstone. The boundary between the Nantuo Formation and the Doushantuo Formation should be placed at the top of the red layer. This study deepens the understanding of the Cryogenian palaeogeography,the southwestern margin of the Yangtze craton. It provides new sedimentological data for improving the isochronous stratigraphic framework from the Cryogenian to Ediacaran,and assists in deep oil and gas exploration in the Sichuan Basin and its surrounding areas.
Corresponding Authors:
KUANG Hongwei,born in 1969,is a professor and doctoral supervisor. She is engaged in sedimentology,stratigraphy,and oil and gas geology. E-mail: kuanghw@126.com. LIU Yongqing,born in 1960,is a research fellow and doctoral supervisor. He is engaged in sedimentology and stratigraphy.E-mail: liuyongqing@cags.ac.cn.
About author: About the first author QI Kening,born in 1990,is a Ph.D. candidate. He is mainly focused on the study of Precambrian sedimentology. E-mail: damiads@foxmail.com.
Cite this article:
QI Kening,KUANG Hongwei,LIU Yongqing et al. Sedimentary characteristics of the Cryogenian Nantuo Formation and stratigraphic attribution of red beds in central Yunnan, southwestern margin of Yangtze Craton[J]. JOPC, 2024, 26(6): 1305-1324.
QI Kening,KUANG Hongwei,LIU Yongqing et al. Sedimentary characteristics of the Cryogenian Nantuo Formation and stratigraphic attribution of red beds in central Yunnan, southwestern margin of Yangtze Craton[J]. JOPC, 2024, 26(6): 1305-1324.
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