Preserved paleo-oceanic plateaus in accretionary complexes: Implications for the contributions of the Pacific superplume to global environmental change

Atsushi Utsunomiya, Norihito Suzuki, Tsutomu Ota

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We have reinvestigated the mid-Cretaceous plume pulse in relation to paleo-oceanic plateaus from accretionary prisms in the circum-Pacific region, and we have correlated the Pacific superplume activity with catastrophic environmental changes since the Neoproterozoic. The Paleo-oceanic plateaus are dated at 75-150 Ma; they were generated in the Pacific superplume region and are preserved in accretionary prisms. The volcanic edifice composed of both modern and paleo-oceanic plateaus is up to 10.7 × 106 km2 in area and 19.1 × 107 km3 in volume. The degassing rate of CO2 (0.82 - 1.1 × 1018 mol/m.y.) suggests a significant impact on Cretaceous global warming. The synchronous occurrence of paleo-oceanic plateaus in accretionary complexes indicates that Pacific superplume pulse activities roughly coincided at the Permo-Triassic boundary and the Vendian-Cambrian boundary interval. The CO2 expelled by the Pacific superplume probably contributed to environmental catastrophes. The initiation of the Pacific superplume contributed to the snowball Earth event near the Vendian-Cambrian boundary; this was one of the most dramatic events in Earth's history. The scale of the Pacific superplume activity roughly corresponds to the scale of drastic environmental change.

Original languageEnglish
Pages (from-to)115-125
Number of pages11
JournalGondwana Research
Volume14
Issue number1-2
DOIs
Publication statusPublished - Aug 1 2008

Keywords

  • Accretionary complex
  • Mid-Cretaceous pulse
  • Oceanic plateau
  • Paleoenvironment
  • The Pacific superplume

ASJC Scopus subject areas

  • Geology

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