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Gupta, Anil K; Das, Moumita; Clemens, Steven C; Mukherjee, Baidehi (2008): Benthic foraminiferal fauna and isotope record in Holocene sediments of the northwest Indian Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.832193, Supplement to: Gupta, AK et al. (2008): Benthic foraminiferal faunal and isotopic changes as recorded in Holocene sediments of the northwest Indian Ocean. Paleoceanography, 23(2), PA2214, https://doi.org/10.1029/2007PA001546

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Abstract:
Historically, the Holocene has been considered an interval of relatively stable climate. However, recent studies from the northern Arabian Sea (Netherlands Indian Ocean Program 905) suggested high-amplitude climate shifts in the early and middle Holocene based on faunal and benthic isotopic proxy records. We examined benthic foraminiferal faunal and stable isotopic data from Ocean Drilling Program (ODP) Site 723 and total organic carbon data from ODP Site 724, Oman Margin (808 and 593 m water depths, respectively). At Site 723 the mid-Holocene shift in d18O values of infaunal benthic species Uvigerina peregrina (1.4 per mil) is 3 times larger than that of epifaunal benthic species Cibicides kullenbergi recorded at Site NIOP 905 off Somalia. However, none of the five other benthic species we measured at Hole 723A exhibits such a shift in d18O. We speculate that the late Holocene d18O decrease in U. peregrina represents species-specific changes in ecological habitat or food preference in response to changes in surface and deep ocean circulation. While the stable isotopic data do not appear to indicate a middle Holocene climatic shift, our total organic carbon and benthic faunal assemblage data do indicate that the early Holocene deep Arabian Sea was influenced by increased ventilation perhaps by North Atlantic Deep Water and/or Circumpolar Deep Water incursions into the Indian Ocean, leading to remineralization of organic matter and a relatively weak early Holocene oxygen minimum zone in the northwest Arabian Sea in spite of strong summer monsoon circulation.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 18.216280 * Median Longitude: 57.680000 * South-bound Latitude: 18.051800 * West-bound Longitude: 57.609000 * North-bound Latitude: 18.463000 * East-bound Longitude: 57.786500
Date/Time Start: 1987-09-15T11:45:00 * Date/Time End: 1987-09-21T08:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Gupta, AK; Das, M; Clemens, SC et al. (2008): (Table 1) Age determination of ODP Hole 117-723A. https://doi.org/10.1594/PANGAEA.832188
  2. Gupta, AK; Das, M; Clemens, SC et al. (2008): (Table S1) Benthic foraminifera of ODP Hole 117-723A. https://doi.org/10.1594/PANGAEA.832190
  3. Gupta, AK; Das, M; Clemens, SC et al. (2008): (Table S2) Stable isotope record of benthic foraminifera of ODP Hole 117-723A. https://doi.org/10.1594/PANGAEA.832192
  4. Gupta, AK; Das, M; Clemens, SC et al. (2008): (Table 2) Age determination of ODP Hole 117-724B. https://doi.org/10.1594/PANGAEA.832189
  5. Gupta, AK; Das, M; Clemens, SC et al. (2008): (Table S3) Benthic foraminifera and TOC of ODP Hole 117-724B. https://doi.org/10.1594/PANGAEA.832191