Jena, Sanjit Kumar; Bhushan, Ravi; Jena, Partha S; Bharti, Nisha; Sudheer, A K; Sanyal, Prasanta; Shivam, Ajay; Dhabi, Ankur (2025): Radiocarbon age and chronology of sediment core SK-312/12, along with Magnesium/Calcium and δ¹⁸O measurements on Trilobatus sacculifer (w/s), and paleotemperature and paleosalinity records [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.974306 (DOI registration in progress)
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Published: 2025-04-15
Abstract:
Sediment core SK-312/12 was collected from the Equatorial Indian Ocean at 3750m b.s.l.. Radiocarbon age-depth profile was continuous up to 70 cm of the core length. The core was sampled at each 1 cm interval. Nearly alternate sections were processed to separate foraminiferal carbonates from the bulk sediment. Radiocarbon ages were obtained from radiocarbon dating of mixed-layer species Globigerinoides ruber and Trilobatus sacculifer taken in sub-equal amounts from 250-425µm size fraction. The radiocarbon ages were calibrated with respect to the MARINE20 Calibration curve (Heaton et al., 2020) with a modern reservoir age (ΔR) of -54 + 65 yr (Dutta et al., 2001; Southon et al., 2002) under the R package "Bacon" (Blaauw & Christeny, 2011), and the Bayesian chronology was obtained. Stable oxygen isotopic analysis was carried out using 50-100µg of Trilobatus sacculifer (w/s) (250-355µm) shells from individual sample sections. Mg/Ca analysis of Trilobatus sacculifer (w/s) (250-355µm) was carried out following the cleaning protocol developed by Barker et al. 2003, the method for foraminiferal Mg/Ca analysis. Paleotemperature was reconstructed using the equation: Mg/Ca (mmol/mol) = 0.24 * exp(0.097T), given by Hollstein et al., 2017. The seawater oxygen isotopic record was obtained using the equation: T (⁰C) = 17 – 4.52 (δ18Ocarb - δ18Osw) + 0.03 (δ18Ocarb - δ18Osw)2, given by Erez & Luz, 1983. Paleosalinity was reconstructed using the equation: δ18Osw (VSMOW) = -8.89 + 0.27 * Ssw, given by Srivastava et al., 2007.
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Jena, Sanjit Kumar; Kumar, Sanjit; Bhushan, Ravi; Sarathi, Partha; Bharti, Nisha; Sudheer, A K; Sanyal, Prasanta; Shivam, Ajay; Dhabi, Ankur (preprint): The Indian Monsoon and North Atlantic Tele-climatic Controls upon the Arabian Sea High Salinity Water Variability into the Equatorial Indian Ocean during the Last Glacial-Interglacial Transition. https://doi.org/10.22541/essoar.171535394.43097288/v1
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Latitude: -0.006800 * Longitude: 65.004830
Date/Time Start: 2014-05-16T00:00:00 * Date/Time End: 2014-05-16T00:00:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
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2 datasets
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Datasets listed in this bundled publication
- Jena, SK; Bhushan, R; Jena, PS et al. (2025): Radiocarbon age and chronology of sediment core SK-312/12. https://doi.pangaea.de/10.1594/PANGAEA.974310
- Jena, SK; Bhushan, R; Jena, PS et al. (2025): Magnesium/Calcium and δ¹⁸O measurements on Trilobatus sacculifer (w/s), and paleotemperature and paleosalinity records of sediment core SK-312/12. https://doi.pangaea.de/10.1594/PANGAEA.974311