Carbonate content, carbon and oxygen stable isotopes of bulk sediment from the eastern equatorial Pacific

Daniele Reghellin, Helen K. Coxall, Jan Backman, Gerald R. Dickens, Simone Galeotti

The data consist of carbonate content and carbon and oxygen stable isotope composition of bulk sediment samples deposited since the late Miocene (~7 Ma) at the International Ocean Discovery Program (IODP) Site U1335 located in the eastern equatorial Pacific (EEP). The stable isotope composition of surface sediment at seven other locations across the EEP are also listed.

These data represent the first set of bulk carbonate content and stable isotope records spanning the last 7 million years (Myr) at a resolution of >20 thousand years (kyr) from a site located off the equator in the northwestern sector of the EEP. The data bring new information on the evolution of oceanographic conditions in the northwestern sector of the EEP.

The results extend the understanding of the evolution and geometry of the late Miocene⁠ – ⁠early Pliocene biogenic bloom in a wider of the EEP. Higher bulk carbonate δ¹⁸O between ca 5⁠ – ⁠7 Myr suggests cooler sea surface tempertures (SST) at Site U1335 compared to other off-equator sites further east.

Citation

Daniele Reghellin, Helen K. Coxall, Jan Backman, Gerald R. Dickens, Simone Galeotti (2022) Carbonate content, carbon and oxygen stable isotopes of bulk sediment from the eastern equatorial Pacific. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/reghellin-2022-sediment-1

References

Reghellin D, Coxall HK, Dickens GR, Galeotti S, Backman J (2022) The late Miocene - early Pliocene biogenic bloom in the eastern equatorial Pacific: new insights from Integrated Ocean Drilling Program Site U1335. Paleoceanography & Paleoclimatology (accepted)

Locarnini RA, Mishonov AV, Baranova OK, Boyer TP, Zweng MM, Garcia HE, Reagan JR, Seidov D, Weathers KW, Paver CR, Smolyar IV (2019) World Ocean Atlas 2018, Volume 1: Temperature. A. Mishonov Technical Editor, NOAA Atlas NESDIS 81, 52 pp.

Lyle M, Drury AJ, Tian J, Wilkens R, Westerhold T (2019) Late Miocene to Holocene high-resolution eastern equatorial Pacific carbonate records: stratigraphy linked by dissolution and paleoproductivity. Climate of the Past 15:1715⁠ – ⁠1739. https://doi.org/10.5194/cp-15-1715-2019

Data description

The data consists of carbonate content and carbon and oxygen stable isotope composition of bulk sediment from the EEP generated by Reghellin et al. (2022).

The dataset contains two data tables:

• Table S1: Carbonate content and stable isotope composition of bulk carbonate at Site U1335. The table contains the carbonate content and the carbon and oxygen stable isotopes measured on 335 sediment samples from IODP Site U1335 located in the eastern equatorial Pacific (5° 18.7’ N latitude, 126° 17.0’ W longitude). The data span the time interval from the late Miocene to recent (~0⁠ – ⁠7 Ma): the age of individual samples was calculated using the astronomically tuned age model of Lyle et al. (2019).

• Table S2: Location and oxygen stable isotope composition of surface sediment samples from the EEP. The table contains the location and the oxygen stable isotope composition of seven surface sediment collected in the eastern equatorial Pacific. Sea surface temperature (SST) estimations are closest to sample location taken from the World Ocean Atlas 2018 (Locarnini et al. 2019).

The data are provided as two xlsx spreadsheet files and also as two comma-separated values (csv) files.

Comments

Data creators and affiliations

• Daniele Reghellin, Department of Pure and Applied Sciences (DiSPeA), University of Urbino Carlo Bo, Urbino, Italy
• Helen K. Coxall, Department of Geological Sciences, Stockholm University, SE-106 91 Stockholm, Sweden
• Gerald R. Dickens, Trinity College, Dublin, Ireland
• Simone Galeotti, Department of Pure and Applied Sciences (DiSPeA), University of Urbino Carlo Bo, Urbino, Italy
• Jan Backman, Department of Geological Sciences, Stockholm University, SE-106 91 Stockholm, Sweden