气候变化领域集成服务门户(CCPortal): Long-term evolution of terrestrial inputs from the Ediacaran to early Cambrian: Clues from Nd isotopes in shallow-marine carbonates; South China

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DOI	10.1016/j.palaeo.2019.109367
	Long-term evolution of terrestrial inputs from the Ediacaran to early Cambrian: Clues from Nd isotopes in shallow-marine carbonates; South China
	Wei G.-Y.; Ling H.-F.; Shields G.A.; Chen T.; Lechte M.; Chen X.; Qiu C.; Lei H.; Zhu M.
发表日期	2019
ISSN	0031-0182
卷号	535
英文摘要	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 (εNd) 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 εNd 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 87Sr/86Sr 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. © 2019 Elsevier B.V.
英文关键词	Animal radiation; Continental denudation; Neodymium isotope record; Neoproterozoic oxygenation event; Tectonic activity
语种	英语
scopus关键词	adaptive radiation; biostratigraphy; Cambrian; carbonate; denudation; Ediacaran; emergence; Gondwana; metazoan; neodymium isotope; organic carbon; oxygenation; shallow water; tectonic setting; Animalia; Metazoa
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150770
作者单位	State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China; Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, United Kingdom; Department of Earth and Planetary Sciences, McGill University, 3450 University St., Montreal, QC H3A 0E8, Canada; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Nanjing, 210008, China
推荐引用方式 GB/T 7714	Wei G.-Y.,Ling H.-F.,Shields G.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],2019,535.
APA	Wei G.-Y..,Ling H.-F..,Shields G.A..,Chen T..,Lechte M..,...&Zhu M..(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.
MLA	Wei G.-Y.,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).