Distribution of Holocene benthic foraminifers in the Izu-Bonin Arc

K. Kaiho, A. Nishimura

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The distribution of Holocene benthic foraminifer species in bottom sediments in the Izu-Bonin Arc region of the northwestern Pacific Ocean has been investigated on the basis of 23 samples recovered from depths between 1100 and 4100 m. The benthic foraminifer faunas identified can be grouped into four species assemblages corresponding to four bathymetric zones. The dominance of such an agglutinated foraminifer as Rhabdamminella sp. characterizes the abyssal zone, whereas assemblages devoid of calcareous foraminifers distinguish the zone deeper than the carbonate compensation depth (CCD). The occurrence of Bulimina aculeata d'Orbigny enables the recognition of the following three bathymetric zones: the lower bathyal zone, the lower middle bathyal zone and the upper middle bathyal zone. To estimate Quaternary and Pliocene paleobathymetry in the Izu-Bonin region, three water-depth indexes will work well: 3700 m for the CCD, 2300 m for the deepest habitat of B. aculeata, and 1600 m for the shallowest habitat of B. aculeata. -from Authors

Original languageEnglish
Pages (from-to)311-320
Number of pages10
JournalUnknown Journal
DOIs
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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