The Kellwasser events in the Upper Devonian Frasnian to Famennian transition in the Toc Tat Formation, northern Vietnam

Toshifumi Komatsu, Ryota Urakawa, Toshitaka Inada, Kazuki Yamauchi, Takumi Maekawa, Reishi Takashima, Mark Williams, Phong D. Nguyen, Hung D. Doan, Minh T. Nguyen, Shuji Niko, Gengo Tanaka, Tatsuhiko Yamaguchi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Upper Devonian carbonates of the Toc Tat Formation in the Si Phai Pass area of Dong Van District, northern Vietnam were deposited in carbonate platform, slope, and basin environments. These carbonates yield abundant conodonts indicative of the Palmatolepis nasuta, Pa. linguiformis and Pa. triangularis zones, the Frasnian–Famennian stage boundary being identified by the first occurrence of Pa. triangularis. Two positive carbon isotope excursions are recognized, the lower excursion peaking in the interval of the lower to middle Pa. nasuta Zone, whilst the upper excursion peaks just above the local Frasnian–Famennian boundary. Based on the biostratigraphy, these excursions equate to the Lower and Upper Kellwasser events. Locally, tentaculitoid taxa (Nowakia, Styliolina, Homoctenus, and Metastyliolina?) are abundant in the interval of the Pa. nasuta Zone, but show a drastic decline in abundance before the Lower Kellwasser Event, and only two taxa survived into the Famennian.

Original languageEnglish
Article numbere12281
JournalIsland Arc
Volume28
Issue number1
DOIs
Publication statusPublished - 2019 Jan

Keywords

  • Devonian Kellwasser events
  • Frasnian–Famennian boundary
  • Vietnam
  • carbon isotopes
  • conodonts
  • depositional environments

ASJC Scopus subject areas

  • Geology

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