An Overview of Oligocene to Recent Sediments of the Western Pacific Warm Pool (WPWP) (International Ocean Discovery Program-IODP Exp. 363) Using Warm and Cool Foraminiferal Species

Authors

  • Patrícia Pinheiro Beck Eichler Programa de Pós-Graduação em Geodinâmica e Geofísica (PPGG), Universidade Federal do Rio Grande do Norte(UFRN), Campus Universitário, Lagoa Nova, 59072-970 - Natal, RN, Brazil; Ecologic Project, Boulder Creek, California, United States
  • Christofer Paul Barker Ecologic Project, Boulder Creek, California, United States
  • Moab Praxedes Gomes Programa de Pós-Graduação em Geodinâmica e Geofísica (PPGG), Universidade Federal do Rio Grande do Norte(UFRN), Campus Universitário, Lagoa Nova, 59072-970 - Natal, RN, Brazil
  • Helenice Vital Programa de Pós-Graduação em Geodinâmica e Geofísica (PPGG), Universidade Federal do Rio Grande do Norte(UFRN), Campus Universitário, Lagoa Nova, 59072-970 - Natal, RN, Brazil

DOI:

https://doi.org/10.30564/jms.v3i3.3516

Abstract

We use the excellent sediment recovery of International Ocean Discovery Program (IODP) Exp. 363, in the Western Pacific Warm Pool (WPWP) to assess down-core variations in the abundance of warm versus cool benthic foraminiferal species through a warm benthic foraminifers (WBF) curve. The total percentage of the “warm” shallower species group (Laticarinina pauperata, Cibicidoides kullenbergi, C. robertsonianus, Cibicidoides sp., Hoeglundina elegans, and Bulimina aculeata) and of the “cool” species group from deep waters (Pyrgo murrhina, Planulina wuellerstorfi, Uvigerina peregrina, and Globobulimina hoeglundi, Hopkinsina pacifica) at all sites is used to assess paleo temporal and spatial variations in preservation and marine temperature. Our study sites span water depths ranging from 875 m to 3421 m and our results indicate that well-preserved living and fossil foraminifera characterize mudline and core sediments at all water depths attesting the wide environmental tolerance of these species to temperature and pressure. Using magneto-and biostratigraphy datum, these sediments are of Oligocene age. Our low-resolution study showed that with the exception of core 1486B which the linear tendency of warmer species is toward cool sediments in old times, all of them show that older sediments indicate warmer periods than today, which is expected from Miocene to Recent. Our results provide evidence for the preservation potential of deeply buried sediments, which has implications on climate reconstructions based on the population dynamics of calcareous benthic foraminifera.

Keywords:

Miocene; Population dynamics; Climate change; Tolerance; Temporal; Spatial

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