Papers

Peer-reviewed Lead author
Aug, 2015

Redox conditions in the end-Early Triassic Panthalassa

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
  • Satoshi Takahashi
  • ,
  • Shin-ichi Yamasaki
  • ,
  • Kazuhiro Ogawa
  • ,
  • Kunio Kaiho
  • ,
  • Noriyoshi Tsuchiya

Volume
432
Number
First page
15
Last page
28
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1016/j.palaeo.2015.04.018
Publisher
ELSEVIER SCIENCE BV

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 (delta C-13(org)) records from the section demonstrate that lower values in the Spathian increase by up to 6 parts per thousand at the Spathian-Anisian transition. This trend accords with the carbonate carbon isotope (delta C-13(carb)) 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. (C) 2015 Elsevier B.V. All rights reserved.

Link information
DOI
https://doi.org/10.1016/j.palaeo.2015.04.018
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000357353500002&DestApp=WOS_CPL
ID information
  • DOI : 10.1016/j.palaeo.2015.04.018
  • ISSN : 0031-0182
  • eISSN : 1872-616X
  • Web of Science ID : WOS:000357353500002

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