globalchange  > 气候变化与战略
DOI: 10.1016/j.jseaes.2019.104137
Constraints on the nature of the Marinoan glaciation: Cyclic sedimentary records from the Nantuo Formation, South China
Author: Yan B.; Shen W.; Zhao N.; Zhu X.
Source Publication: Journal of Asian Earth Sciences
ISSN: 13679120
Publishing Year: 2020
Volume: 189
Language: 英语
Keyword: Episodic glacial evolution ; Marinoan glaciation ; Nantuo formation ; South China
Scopus Keyword: climate variation ; core analysis ; debris flow ; depositional environment ; glacial deposit ; glaciation ; glaciomarine deposit ; ice retreat ; lithofacies ; paleoclimate ; sedimentary sequence ; sedimentology ; China ; Guizhou
English Abstract: Detailed sedimentological investigations of the Cryogenian glacial deposits are critical for constraining the true nature of the Sturtian and Marinoan glaciations. The entire succession of the Nantuo Formation, which corresponds to the Marinoan glaciation, is well developed in South China. Here a detailed lithological and sedimentological analysis of two cores of the Nantuo Formation in Guizhou, South China, is presented in which two continuous ice advance–retreat cycles are identified. The base consists of a massive diamictite lithofacies that is representative of glacier-dominated subaqueous debris flow deposits. These proximal glaciomarine deposits are overlain by a gravel-free sandy mudstone lithofacies that is lacking in diamictites, which implies distal glaciomarine deposits. This ice advance–retreat sedimentary cycle is overlain by a weakly laminated diamictite lithofacies, which represents subaqueous debris flow deposits that formed during the second episode of ice advance. These proximal glaciomarine deposits are overlain by an interbedded sandstone–mudstone lithofacies, which is indicative of distal glaciomarine deposits that formed during another episode of ice retreat. These sedimentary cycles imply that the climate switched twice from relatively warm to extremely cold and back during the Marinoan glaciation. The global sea-level and sedimentary environments fluctuated in response to these climate changes. This co-evolution of the climate, sea-level, and sedimentary environments, which is represented by the lithofacies and sedimentary sequence of the Nantuo Formation, as well as the corresponding strata of other sections worldwide, suggests that the Marinoan glaciation is characterized by a progressive and dynamic course. © 2019 Elsevier Ltd
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Affiliation: MNR Key Laboratory of Isotope Geology, MNR Key Laboratory of Deep-Earth Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China

Recommended Citation:
Yan B.,Shen W.,Zhao N.,et al. Constraints on the nature of the Marinoan glaciation: Cyclic sedimentary records from the Nantuo Formation, South China[J]. Journal of Asian Earth Sciences,2020-01-01,189
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