Publication Date:
2024-04-26
Description:
This dataset contains nannofossil assemblage and planktonic foraminifera assemblage data, the total encountered abundance of diatoms from ODP Site 722B. D/V JOIDES Resolution carried out drilling of ODP Site 722 as part of ODP Leg 117 between the 6th and 8th of September 1989. The samples used for data analysis presented in this entry were sampled from drill cores cored by XCB (see Shipboard Scientific Party, 1989; doi:10.2973/odp.proc.ir.117.107.1989). Sampling was conducted in the Kochi Core Center (KCC) in 2018.
The data in this submission was generated to conduct research into upwelling and nutrient flux changes in the Oman Margin Upwelling Zone, details on data acquisition and hypothesis can be found in the associated publication.
Nannofossil data was generated at JAMSTEC, Yokosuka, Japan, in April 2019 on an Olympus X52 polarizing light microscope under 1000x magnification. Calculation of total abundances of nannofossil and diatom and the sum of all siliceous fragments (including diatoms, radiolarian fragments and silicoflagellates) are given as numbers per gram (#/g) of dry bulk sediment following the methodology of Bordiga et al. (2015; doi:10.1016/j.revmic.2015.05.002). The dataset further provides sample-specific bulk accumulation rates based on the interpolated bulk density data based on shipboard moisture and density (MAD) data present in the ODP Site 722 Site Report of ODP Leg 117 (Shipboard Scientific Party, 1989; doi:10.2973/odp.proc.ir.117.107.1989), allowing for calculating calcareous nannofossil, diatom and planktonic foraminifer fluxes. Planktonic foraminifera assemblage data was generated at the University of Graz using a Zeiss V8 stereo microscope in 2019. Samples were sieved using a standard sieve set and picked from the size factions 〈500 µm, 500 - 250 µm and 250 - 125 µm. Foraminifer assemblage data is provided as specimens per g of sediment (#/g) and percentage data (%). The percentage data of foraminifera assemblages also contains information on the habitat of the identified planktonic foraminifera taxa to reproduce the ecological grouping of the taxa as applied in Auer et al. (pre-print 2023; doi:10.5194/cp-2023-14).
The age model of all provided datasets is based on Bialik et al. (2020; doi:10.1029/2019pa003762).
Keywords:
117-722B; Arabian Sea; DRILL; Drilling/drill rig; Joides Resolution; Leg117; Miocene; Monsoon; Upwelling
Type:
Dataset
Format:
application/zip, 3 datasets
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