Multivariate analysis of geochemical compositions of bedded chert during the Middle Triassic (Anisian) oceanic anoxic events in the Panthalassic Ocean

Katsuhito Soda, Tetsuji Onoue

Research output: Contribution to journalArticle

Abstract

The Middle Triassic has been interpreted as the epoch of the biotic recovery phase from the end-Permian mass extinction. In particular, the early Middle Triassic (Anisian) oceanic anoxic events are thought to be important as the final ones before the rebuilding of marine ecosystems with complex trophic levels such as modern. However, details of global environmental and biotic changes during the Anisian oceanic anoxic events remain unclear. In this study, we applied multivariate analysis to extract geochemical components controlling chemical compositional changes on the high resolution geochemical stratigraphy of the Middle Triassic (Anisian) bedded chert sequence in central Japan, which deposited in a pelagic deep seafloor in a low- to mid-latitude zone of the Panthalassic Ocean. Two geochemical components were extracted from the major elemental compositions. The first component explained the chemical weathering intensity, whose statistics indicate that the chemical weathering intensity increased before and decreased within or after the anoxic conditions. The second component represented the biogenic apatite accumulation, whose statistics suggest that the higher biogenic apatite accumulation during the oxic conditions and the minor variations in this dataset. Integrated stratigraphic data suggest that the chemical weathering intensity controlled the timings and the durations of the middle Anisian oceanic anoxic events and these situations affected the biogenic apatite accumulation.

Original languageEnglish
Pages (from-to)91-102
Number of pages12
JournalGEOCHEMICAL JOURNAL
Volume53
Issue number2
DOIs
Publication statusPublished - Jan 1 2019
Externally publishedYes

Fingerprint

Apatites
Anisian
chert
Weathering
multivariate analysis
weathering
oceans
chemical weathering
Triassic
apatites
apatite
ocean
Chemical analysis
Statistics
Stratigraphy
Aquatic ecosystems
time measurement
statistics
stratigraphy
mass extinction

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

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abstract = "The Middle Triassic has been interpreted as the epoch of the biotic recovery phase from the end-Permian mass extinction. In particular, the early Middle Triassic (Anisian) oceanic anoxic events are thought to be important as the final ones before the rebuilding of marine ecosystems with complex trophic levels such as modern. However, details of global environmental and biotic changes during the Anisian oceanic anoxic events remain unclear. In this study, we applied multivariate analysis to extract geochemical components controlling chemical compositional changes on the high resolution geochemical stratigraphy of the Middle Triassic (Anisian) bedded chert sequence in central Japan, which deposited in a pelagic deep seafloor in a low- to mid-latitude zone of the Panthalassic Ocean. Two geochemical components were extracted from the major elemental compositions. The first component explained the chemical weathering intensity, whose statistics indicate that the chemical weathering intensity increased before and decreased within or after the anoxic conditions. The second component represented the biogenic apatite accumulation, whose statistics suggest that the higher biogenic apatite accumulation during the oxic conditions and the minor variations in this dataset. Integrated stratigraphic data suggest that the chemical weathering intensity controlled the timings and the durations of the middle Anisian oceanic anoxic events and these situations affected the biogenic apatite accumulation.",
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