Geochemistry and molybdenum isotopes of the basal Datangpo Formation: Implications for ocean-redox conditions and organic matter accumulation during the Cryogenian interglaciation

The basal Datangpo Formation in South China deposited in the Cryogenian interglacial period has gained increasing interest with the well development of organic-rich black shale and its hosted manganese (Mn) deposits (Mn carbonate), which contain important clues to the paleoclimate and ocean redox of...

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Published in:Palaeogeography, palaeoclimatology, palaeoecology palaeoclimatology, palaeoecology, 2021-02, Vol.563, p.110169, Article 110169
Main Authors: Tan, Zhaozhao, Jia, Wanglu, Li, Jie, Yin, Lu, Wang, Susu, Wu, Jinxiang, Song, Jianzhong, Peng, Ping’an
Format: Article
Language:English
Subjects:
Black shale
Mn carbonate
Nanhua Basin
Nutrient elements
Oceanic anoxia
Sturtian glaciation
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Summary:The basal Datangpo Formation in South China deposited in the Cryogenian interglacial period has gained increasing interest with the well development of organic-rich black shale and its hosted manganese (Mn) deposits (Mn carbonate), which contain important clues to the paleoclimate and ocean redox of this critical interval in Earth's history. The depositional environment of Mn deposits is still uncertain, as suggested by different suites of redox-indicating parameters. In addition, the Mn deposits are notable for their enrichment in organic matter (OM), despite the fact that the diagenetic origin for the Mn deposits would result in large consumption of OM. To gain insight into these issues, we present the geochemical and molybdenum (Mo) isotopic data of black shale and Mn carbonate samples from a new section. The Datangpo Mn carbonates are characterized by low Mo content (mostly
ISSN:0031-0182
1872-616X
DOI:10.1016/j.palaeo.2020.110169