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Stylasterid corals: a new paleotemperature archive

Samperiz, Ana, Robinson, Laura F., Stewart, Joseph A., Strawson, Ivo, Leng, Melanie J., Rosenheim, Brad E., Ciscato, Emily R., Hendry, Katharine R. and Santodomingo, Nadiezhda 2020. Stylasterid corals: a new paleotemperature archive. Earth and Planetary Science Letters 545 , 116407. 10.1016/j.epsl.2020.116407

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Stylasterids are a ubiquitous deep-sea coral taxon that build their skeletons from either calcite, aragonite, or both. Yet, robust geochemical proxy data from these corals are limited. In this study, 95 modern stylasterids, spanning a wide range of depths (63 to 2894 m) and ambient seawater temperatures (0 to 17 °C), were tested for their potential use as paleoceanographic archives. Stable oxygen and carbon isotopic composition (O and C) were measured from the main trunk of all specimens and five specimens were further sub-sampled to assess internal chemical variability. The isotope data show non-equilibrium precipitation from seawater for both O and C, with the growing tips of colonies yielding the isotopically lowest values. Overall, the calcitic corals showed lower isotope values for O and C than aragonitic specimens. Within the aragonite corals, we present a O:temperature calibration that exhibits a significant linear relationship with the equation Ocoral-seawater = −0.22(°C) + 3.33(±0.06) across a temperature range of 0 to 30 °C, using samples from this study and published data. This work highlights the potential application of stylasterid coral O data to reconstruct paleo seawater temperature.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Elsevier
ISSN: 0012-821X
Funders: This research was supported by the Natural Environment Research Council (NERC) grants NE/S001743/1, NE/R005117/1, NE/N003861/1, the European Research Council (ERC) grant 278705, the US National Science Foundation (NSF) grants 0636787, 0944474, and 0902957 and the Leverhulme Trust.
Date of First Compliant Deposit: 27 June 2020
Date of Acceptance: 6 June 2020
Last Modified: 01 Jul 2020 14:15

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