DOI: 10.1016/j.palaeo.2015.04.018
论文题名: Redox conditions in the end-Early Triassic Panthalassa
作者: Takahashi S. ; Yamasaki S.-I. ; Ogawa K. ; Kaiho K. ; Tsuchiya N.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 432 起始页码: 15
结束页码: 28
语种: 英语
英文关键词: Deep-sea
; Early Triassic
; Pyrite framboid
; Redox conditions
; Sulphur isotope
; Trace element
英文摘要: This study focuses on an upper Lower Triassic (Spathian) to lowermost Middle Triassic (Anisian) section representing the central Panthalassic deep sea. Analysed organic carbon isotope ratio (δ13Corg ) records from the section demonstrate that lower values in the Spathian increase by up to 6‰ at the Spathian-Anisian transition. This trend accords with the carbonate carbon isotope (δ13Ccarb ) record from shallow-water carbonate sections. Most horizons during late Spathian-early Anisian show features of redox conditions of not fully oxic but dysoxic conditions, inferred from low Mn, U, V, Mo and euhedral pyrite-dominated occurrences. Conversely, in the end-Spathian black-coloured beds and underlying siliceous claystone beds, relatively higher concentrations of redox-sensitive elements such as U, V, Mo and abundant pyrite framboids are detected. As enrichment factors of redox-sensitive elements are not much higher than the typical anoxic-sulphidic trend and large pyrite framboids are found, these trends suggest suboxic rather than strong anoxic conditions. These oxygen-poor conditions coincide with carbon isotope minimum values at the late Spathian. At the same time, reducing seawater conditions have been also reported in from continental sections. These coincidences imply global environmental perturbations that may have been related to the delayed recovery of life after the end-Permian mass extinction. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68904
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Planetary Science, University of Tokyo, Hongo 7-3-1, Tokyo, Japan; Graduate School of Environmental Studies, Tohoku University, Aramaki-Aza-Aoba 6-6-20, Sendai, Japan; Graduate School of Science, Tohoku University, Aramaki-Aza-Aoba 6-3, Sendai, Japan
Recommended Citation:
Takahashi S.,Yamasaki S.-I.,Ogawa K.,et al. Redox conditions in the end-Early Triassic Panthalassa[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,432