A paleogene magmatic overprint on cretaceous seamounts of the Western Pacific

Naoto Hirano, Hirochika Sumino, Taisei Morishita, Shiki Machida, Takaomi Kawano, Kazutaka Yasukawa, Takafumi Hirata, Yasuhiro Kato, Teruaki Ishii

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The West Pacific Seamount Province (WPSP) represents a series of short-lived Cretaceous hotspot tracks. However, no intraplate volcanoes in advance of petit-spot volcanism erupted near a trench have been identified after the formation of the WPSP on the western Pacific Plate. This study reports new ages for Paleogene volcanic edifices within the northern WPSP, specifically the Ogasawara Plateau and related ridges, and Minamitorishima Island. These Paleogene ages are the first reported for basaltic rocks on western Pacific seamounts, in an area that has previously only yielded Cretaceous ages. The newly found Paleogene volcanisms overprint the Early–middle Cretaceous volcanic edifices, because the seamount or paleo-island material-covered reefal limestone caps on these edifices are uniformly older than the Paleogene volcanism identified in this study. This study outlines several possible causative factors for the Paleogene volcanism overprinting onto existing Cretaceous seamounts, including volcanism related to lithospheric stress, or a younger hotspot track within the northern part of the WPSP that records magmatism from ~60 Ma.

Original languageEnglish
Article numbere12386
Pages (from-to)1-16
Number of pages16
JournalIsland Arc
Volume30
Issue number1
DOIs
Publication statusPublished - 2021 Jan 1

Keywords

  • Alkali-basalt
  • Hotspot
  • Pacific plate
  • Paleogene
  • Petit-spot
  • Rejuvenation
  • Seamount

ASJC Scopus subject areas

  • Geology

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