IOCAS-IR  > 海洋地质与环境重点实验室
Contrasting Mo-U enrichments of the basal Datangpo Formation in South China: Implications for the Cryogenian interglacial ocean redox
Ye, Yuntao1,2,3; Wang, Huajian3; Zhai, Lina4; Wang, Xiaomei3; Wu, Chaodong1,2; Zhang, Shuichang3
2018-09-01
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume315Pages:66-74
Corresponding AuthorZhang, Shuichang(sczhang@petrochina.com.cn)
AbstractPaleoredox reconstructions of Neoproterozoic successions have been the subject of long-standing debates, especially concerning the precise timing of ocean ventilation and its causal relationship, if any, with the evolution of early animal life. Sponge biomarkers and putative sponge-like body fossils have been found from rocks in the Cryogenian Period, yet the contemporaneous deep-water conditions remain poorly understood. To fill this gap, we report pyrite morphology, trace metal enrichments, and total organic carbon data from interglacial black shales of the lower Datangpo Formation at Daotuo area, northeast Guizhou Province, South China. A contrasting Mo-U enrichments pattern emerges from the basal Datangpo black shales, despite the persistently euxinic local environment as testified by the presence of abundant tiny pyrite framboids. Molybdenum is markedly enriched in the basal interval and its concentration decreases sharply up section, while uranium stays relatively constant at crustal concentrations throughout the entire profile. This decoupled Mo-U signature, integrated with a simple mass balance model, suggests that euxinia only covered a small proportion of the dominantly ferruginous global seafloor, thus allowing dissolved Mo to accumulate to significant level in seawater. The enrichment degrees of Mo, although nontrivial, are still much lower than those from Phanerozoic equivalents. Contrarily, they are quite close to the total mean abundance for Mesoproterozoic euxinic shales. Such a mild increase of marine Mo-U inventory is therefore inferred as recording no dramatic rise in oxygen levels following the Sturtian glaciation. A drop of Mo contents after the basal interval could represent either limited Mo availability or inadequate hydrogen sulfide supply.
KeywordCryogenian Datangpo Formation Pyrite framboid Trace elements Seafloor redox Nanhua Basin
DOI10.1016/j.precamres.2018.07.013
Indexed BySCI
Language英语
Funding ProjectStrategic Priority Research Program of the Chinese Academy of Sciences[XDA14010101] ; State Key Program of National Natural Science Foundation of China[41530317] ; National Science and Technology Major Project of the Ministry of Science and Technology of China[2016ZX05004-001] ; Scientific Research and Technological Development Project of China National Petroleum Corporation[CNPC 2016A-0204]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000445165800004
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/160178
Collection海洋地质与环境重点实验室
Corresponding AuthorZhang, Shuichang
Affiliation1.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Minist Educ, Beijing 100871, Peoples R China
2.Peking Univ, Inst Oil & Gas, Beijing 100871, Peoples R China
3.China Natl Petr Corp, Key Lab Petr Geochem, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
4.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China
Recommended Citation
GB/T 7714
Ye, Yuntao,Wang, Huajian,Zhai, Lina,et al. Contrasting Mo-U enrichments of the basal Datangpo Formation in South China: Implications for the Cryogenian interglacial ocean redox[J]. PRECAMBRIAN RESEARCH,2018,315:66-74.
APA Ye, Yuntao,Wang, Huajian,Zhai, Lina,Wang, Xiaomei,Wu, Chaodong,&Zhang, Shuichang.(2018).Contrasting Mo-U enrichments of the basal Datangpo Formation in South China: Implications for the Cryogenian interglacial ocean redox.PRECAMBRIAN RESEARCH,315,66-74.
MLA Ye, Yuntao,et al."Contrasting Mo-U enrichments of the basal Datangpo Formation in South China: Implications for the Cryogenian interglacial ocean redox".PRECAMBRIAN RESEARCH 315(2018):66-74.
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