Stylasterid corals: a new paleotemperature archive

Samperiz, Ana; Robinson, Laura F.; Stewart, Joseph A.; Strawson, Ivo; Leng, Melanie J. ORCID: https://orcid.org/0000-0003-1115-5166; Rosenheim, Brad E.; Ciscato, Emily R.; Hendry, Katharine R.; Santodomingo, Nadiezhda. 2020 Stylasterid corals: a new paleotemperature archive. Earth and Planetary Science Letters, 545, 116407. https://doi.org/10.1016/j.epsl.2020.116407

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Official URL: http://dx.doi.org/10.1016/j.epsl.2020.116407

Abstract/Summary

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:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.epsl.2020.116407
ISSN:	0012821X
Date made live:	03 Jul 2020 12:11 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/528065

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1016/j.epsl.2020.116407

ISSN:

0012821X

Date made live:

03 Jul 2020 12:11 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/528065