Abstract 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 ( δ 18 O and δ 13 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 δ 18 O and δ 13 C, with the growing tips of colonies yielding the isotopically lowest values. Overall, the calcitic corals showed lower isotope values for δ 18 O and δ 13 C than aragonitic specimens. Within the aragonite corals, we present a δ 18 O:temperature calibration that exhibits a significant linear relationship with the equation δ 18 Ocoral-seawater = −0.22 ( ± 0.01 ) × T (°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 δ 18 O data to reconstruct paleo seawater temperature.

中文翻译：

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Stylasterid 珊瑚：一个新的古温度档案

摘要 Stylasterids 是一种无处不在的深海珊瑚分类群，它们的骨骼由方解石、文石或两者兼而有之。然而，来自这些珊瑚的强大地球化学代理数据是有限的。在这项研究中，测试了 95 种现代 stylasterids，它们的深度范围很广（63 到 2894 m），环境海水温度（0 到 17 °C），它们作为古海洋档案的潜在用途进行了测试。从所有标本的主干中测量了稳定的氧和碳同位素组成（δ 18 O 和 δ 13 C），并进一步对五个标本进行了子采样以评估内部化学变异性。同位素数据显示，δ 18 O 和 δ 13 C 均来自海水的非平衡沉淀，菌落的生长尖端产生同位素最低值。全面的，方解石珊瑚的 δ 18 O 和 δ 13 C 同位素值低于文石标本。在文石珊瑚中，我们提出了一个 δ 18 O：温度校准，它与方程 δ 18 Ocoral-seawater = −0.22 (± 0.01 ) × T (°C) + 3.33(±0.06) 在整个温度范围内表现出显着的线性关系范围为 0 到 30 °C，使用本研究的样本和已发表的数据。这项工作突出了柱形珊瑚 δ 18 O 数据在重建古海水温度方面的潜在应用。