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Long-term evolution of terrestrial inputs from the Ediacaran to early Cambrian: Clues from Nd isotopes in shallow-marine carbonates, South China
Wei, Guang-Yi; Ling, Hong-Fei; Shields, Graham A.; Chen, Tianyu; Lechte, Maxwell; Chen, Xi; Qiu, Chen; Lei, Huanling; Zhu, Maoyan (朱茂炎)
2019-12-01
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume535Pages:12
Abstract

The emergence and radiation of metazoans have been widely attributed to a progressively more oxidizing surface environment through the Ediacaran-Cambrian transition interval. However, the root causes for atmospheric and oceanic oxygenation are still disputed. Long-term tectonic changes could possibly have led to atmospheric oxygenation but geochemical evidence for this linkage remains elusive. In this study, we analyzed the radiogenic Nd isotopic compositions (epsilon Nd) of shallow-marine carbonates from South China in order to track secular variations in terrestrial inputs from Ediacaran to early Cambrian time. Compared with most other geochemical indices, the Nd isotope system in carbonates is less susceptible to early diagenetic exchange and can thus act as a robust proxy for continental materials undergoing weathering. We interpret an abrupt excursion to lower eNd values during the middle Ediacaran as due to rapid exchange of different water masses. However, the more gradual trend towards lower Nd isotope values from the Ediacaran to early Cambrian, accompanied by increasing Sr-87/Sr-86 ratios of the studied carbonates, likely indicates the enhanced weathering of old continental rock following the assembly of Gondwana. Increased net accumulation of atmospheric oxygen as a result of enhanced organic carbon burial may have benefited from intense continental denudation.

KeywordNeodymium isotope record Continental denudation Tectonic activity Neoproterozoic oxygenation event Animal radiation
DOI10.1016/j.palaeo.2019.109367
Language英语
WOS KeywordEARTH-ELEMENT GEOCHEMISTRY ; DOUSHANTUO FORMATION ; NEODYMIUM ISOTOPES ; ATMOSPHERIC OXYGEN ; OCEAN CIRCULATION ; SEAWATER ; RISE ; DIAGENESIS ; RODINIA ; CONSTRAINTS
Funding ProjectStrategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS)[XDB26000000] ; National Natural Science Foundation of China (NSFC) program[41872002] ; National Natural Science Foundation of China (NSFC) program[41661134048] ; program A for Outstanding PhD. Candidate of Nanjing University[201802A020]
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000504786400011
Funding OrganizationStrategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; National Natural Science Foundation of China (NSFC) program ; program A for Outstanding PhD. Candidate of Nanjing University
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/29547
Collection中国科学院南京地质古生物研究所
Corresponding AuthorWei, Guang-Yi; Ling, Hong-Fei
Affiliation1.Nanjing Univ, Sch Earth Sci & Engn, Dept Earth Sci, State Key Lab Mineral Deposits Res, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China
2.UCL, Dept Earth Sci, Gower St, London WC1E 6BT, England
3.McGill Univ, Dept Earth & Planetary Sci, 3450 Univ St, Montreal, PQ H3A 0E8, Canada
4.Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Wei, Guang-Yi,Ling, Hong-Fei,Shields, Graham A.,et al. Long-term evolution of terrestrial inputs from the Ediacaran to early Cambrian: Clues from Nd isotopes in shallow-marine carbonates, South China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2019,535:12.
APA Wei, Guang-Yi.,Ling, Hong-Fei.,Shields, Graham A..,Chen, Tianyu.,Lechte, Maxwell.,...&Zhu, Maoyan .(2019).Long-term evolution of terrestrial inputs from the Ediacaran to early Cambrian: Clues from Nd isotopes in shallow-marine carbonates, South China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,535,12.
MLA Wei, Guang-Yi,et al."Long-term evolution of terrestrial inputs from the Ediacaran to early Cambrian: Clues from Nd isotopes in shallow-marine carbonates, South China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 535(2019):12.
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