Upper Triassic foraminifers from Panthalassan carbonate buildups of southwestern Japan and their paleobiogeographic implications

Jérôme Chablais, Rossana Martini, Fumio Kobayashi, Gérard M. Stampfli, Tetsuji Onoue

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Detailed sampling of the Upper Triassic atoll-type carbonates of the Sambosan Accretionary Complex throughout Southwest Japan yielded highly abundant and diversified porcelaneous, microgranular, agglutinated and hyaline foraminifers of Carnian-Rhaetian age, as well as some microproblematica and ostracods. The foraminiferal assemblages were collected from shallow-water carbonates originated upon volcanic seamounts surrounded by deep-water radiolarian chert in a mid-open oceanic realm of the Panthalassan Ocean during Triassic time. Because most studies of the Upper Triassic microfauna come from the former Tethys, counterparts of the Panthalassan Ocean are pivotal to decipher the micropalaeontological biodiversity of the western circum Pacific, as well as to evaluate the distribution patterns of organisms and their evolution trends throughout the Tethys and Panthalassa. This study reports on 42 genera and 60 species whose associations can be used as sedimentary facies indicators of carbonate buildup environments. Japanese specimens show a strong Tethyan affinity, and especially with the Peri-and Southern Tethyan forms. A palaeobiogeographic distribution analysis using a large foraminiferal database is led, in order to evaluate the extraordinary spreading of these Upper Triassic foraminifers between the Neo-Tethys and the Panthalassa. Data are finally integrated in a new plate tectonic model, where six faunistic provinces are defined, each containing a characteristic foraminiferal assemblage. This map provides for the first time a useful and visual synthesis of the Upper Triassic foraminifer palaeobiogeographic distribution.

Original languageEnglish
Pages (from-to)93-124
Number of pages32
JournalMicropaleontology
Volume57
Issue number2
Publication statusPublished - May 10 2011

Fingerprint

foraminifera
Triassic
carbonate
Tethys
Rhaetian
Carnian
faunistics
atoll
ocean
chert
seamount
plate tectonics
ostracod
shallow water
deep water
biodiversity
sampling
distribution

All Science Journal Classification (ASJC) codes

  • Palaeontology

Cite this

Upper Triassic foraminifers from Panthalassan carbonate buildups of southwestern Japan and their paleobiogeographic implications. / Chablais, Jérôme; Martini, Rossana; Kobayashi, Fumio; Stampfli, Gérard M.; Onoue, Tetsuji.

In: Micropaleontology, Vol. 57, No. 2, 10.05.2011, p. 93-124.

Research output: Contribution to journalArticle

Chablais, Jérôme ; Martini, Rossana ; Kobayashi, Fumio ; Stampfli, Gérard M. ; Onoue, Tetsuji. / Upper Triassic foraminifers from Panthalassan carbonate buildups of southwestern Japan and their paleobiogeographic implications. In: Micropaleontology. 2011 ; Vol. 57, No. 2. pp. 93-124.
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