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Deep-sea stylasterid delta.sup.18O and delta.sup.13C maps inform sampling scheme for paleotemperature reconstructions
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Deep-sea stylasterid delta.sup.18O and delta.sup.13C maps inform sampling scheme for paleotemperature reconstructions
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Deep-sea stylasterid delta.sup.18O and delta.sup.13C maps inform sampling scheme for paleotemperature reconstructions
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Journal Article
Deep-sea stylasterid delta.sup.18O and delta.sup.13C maps inform sampling scheme for paleotemperature reconstructions
2024
Overview
Deep-sea corals have the potential to provide high-resolution paleotemperature records to evaluate oceanographic changes in settings that are vulnerable to current and future ocean warming. The isotopic records preserved in coral skeletal carbonate, however, are limited by their large offsets from isotopic equilibrium with seawater. These \"vital effects\" are the result of biological influences (kinetic and metabolic) on the calcification of coral skeletons and are well known to drive oxygen and carbon stable isotope ratios ([delta].sup.18 O and [delta].sup.13 C, respectively) away from isotopic equilibrium with environmental variables. In this study, two calcitic stylasterid corals (Errina fissurata) are sampled via cross sections through their primary growth axes to create skeletal [delta].sup.18 O and [delta].sup.13 C maps. The maps reveal a consistent trend of increasing isotopic values toward the innermost portion of the cross sections, with minimal spatial change in carbonate mineralogy, the average center values being â¼1 0/00 and â¼3 0/00 closer to seawater [delta].sup.18 O and [delta].sup.13 C equilibrium values, respectively. We investigate possible mechanisms for these isotopic trends, including potential growth patterns that would drive spatial isotopic trends. Our results highlight the diversity of the stylasterid coral family, and because of our unique sampling strategy, we can prescribe that E. fissurata corals with minimal mineralogical variability be sampled from the center portions of their stems to achieve accurate paleotemperature reconstructions.
Publisher
Copernicus GmbH
Subject
