DOI: 10.1016/j.scib.2021.04.021
论文题名: The largest negative carbon isotope excursions in Neoproterozoic carbonates caused by recycled carbonatite volcanic ash
作者: Liu Y. ; Chen W. ; Foley S.F. ; Shen Y. ; Chen C. ; Li J. ; Ou X. ; He D. ; Feng Q. ; Lin J.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
语种: 英语
中文关键词: Decarbonation
; Doushantuo
; Igneous processes
; Negative δ13C excursions
; Recycled carbonatite
; Shuram Excursion
英文摘要: The late Ediacaran Shuram Excursion (SE) records the most prominent negative δ13C excursions (δ13C = −12‰) during Earth's history. It has been hypothesized to have resulted from oxidation of dissolved organic matter, diagenetic or authigenic precipitates. However, the origin of the SE remains enigmatic; current models face challenges regarding the significant amount of atmospheric oxygen needed to balance such extensive oxidation and sustained inputs of light carbon with extremely negative C isotope compositions. Here, we show that the Doushantuo Formation at the Jiulongwan section in South China, a key stratum recording the SE event, contains mineralogical and geochemical signatures related to igneous processes. Both the occurrence of ankerite, feldspar, moissanite and euhedral quartz in the SE samples and the relatively consistent Ce anomalies of carbonate and O isotopes of quartz indicate a contribution from an igneous source. In particular, the SE samples have trace element and C isotope compositions similar to those of recycled carbonatites formed by decarbonation and melting of sedimentary carbonate rocks. These observations suggest that the deep cycle of ancient carbonate rocks, which were subjected to decarbonation during subduction, melting and eruption related to the breakup of the Rodinia supercontinent, contributed to the SE. This igneous model for the SE may provide a connection between the deep and shallow carbon cycles of the Earth. © 2021 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170341
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; Department of Earth and Environmental Sciences, Macquarie University, North Ryde 2109, NSW, Australia; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
Recommended Citation:
Liu Y.,Chen W.,Foley S.F.,et al. The largest negative carbon isotope excursions in Neoproterozoic carbonates caused by recycled carbonatite volcanic ash[J]. Science Bulletin,2021-01-01