Stylasterid corals: A new paleotemperature archive

Stylasterid corals: A new paleotemperature archive
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Stylasterid珊瑚:新的古温度档案

DOI:
10.1016/j.epsl.2020.116407
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发表时间:
2020
影响因子:
5.3
通讯作者:
Samperiz A
Samperiz A
中科院分区:
地球科学1区
文献类型:
--
作者:
Samperiz A

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柱珊瑚是一种普遍存在的深海珊瑚分类群,它们的骨骼由方解石、文石或两者构成。然而,这些珊瑚的强有力的地球化学代用数据是有限的。在这项研究中,95个现代样式表,跨越了广泛的深度(63至2894米)和环境海水温度(0至17° C),测试了它们作为古海洋学档案的潜在用途。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),并对5个标本进一步取样,以评估内部化学变化。同位素数据显示,δ 18 O和δ 13 C都是来自海水的非平衡沉淀,菌落生长的尖端产生同位素最低值。总体而言,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,该校准在0至30° C的温度范围内与δ 18 O珊瑚-海水=− 0.22(±0.01)× T(° C)+3.33(±0.06)呈现出显着的线性关系。这项工作突出了柱珊瑚δ 18 O数据在重建古海水温度方面的潜在应用。
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 O coral-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.
佛罗里达群岛的珊瑚礁和布莱克高原的深海珊瑚的氧和碳同位素生长记录
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