气候变化领域集成服务门户(CCPortal): The influence of seawater chemistry on carbonate-associated sulfate derived from coral skeletons

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DOI	10.1016/j.palaeo.2019.02.011
	The influence of seawater chemistry on carbonate-associated sulfate derived from coral skeletons
	Giri S.J.; Swart P.K.
发表日期	2019
ISSN	0031-0182
起始页码	72
结束页码	81
卷号	521
英文摘要	It has long been established that seawater Mg/Ca ratios fluctuate over geological time scales (10 6 years), synchronous with seawater sulfate (SO 4 2− ) concentrations. As carbonate minerals closely track the Mg/Ca ratio of seawater and contain a substantial amount of carbonate-associated sulfate (CAS), they may therefore be excellent proxies for coeval oscillations in seawater Mg/Ca ratios and SO 4 2− concentrations. Here, we report on a series of experiments designed to understand CAS incorporation into biogenic aragonite under seawater conditions characteristic of the Mesozoic and Cenozoic. In order to understand the combined effect of fluctuations in seawater Mg/Ca ratios and SO 4 2− concentrations on CAS incorporation in coral skeletons, fragments of Pocillopora damicornis were grown in treatments in which the SO 4 2− , Ca 2+ and Mg 2+ concentrations were varied independently and Ca 2+ and SO 4 2− concentrations were varied in combination. These experiments demonstrate that CAS incorporation in coral skeletons linearly and proportionally correlates with seawater SO 4 2− concentrations, but is complicated by concomitant changes in seawater Ca 2+ concentrations. These trends do not appear to be rate dependent and are likely related to the formation of ion complexes in seawater and/or biological changes induced by increased/decreased seawater Ca 2+ concentrations. This work has important implications for understanding fluctuations in Mesozoic and Cenozoic SO 4 2− concentrations and does not necessarily exclude coral skeletons as archives for understanding fluctuations in the SO 4 2− isotopic (δ 34 S) composition of seawater. © 2019 Elsevier B.V.
英文关键词	Calcite and aragonite seas; Distribution coefficients; Mg/Ca; Pocillopora damicornis; S/Ca; δ 34 S
语种	英语
scopus关键词	aragonite; calcite; calcium; carbonate; coral reef; magnesium; paleoceanography; seawater; skeleton; spatial distribution; sulfate; sulfur isotope; water chemistry; Anthozoa; Pocillopora damicornis
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151010
作者单位	Department of Marine Geosciences, Rosenstiel School of Marine & Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, United States
推荐引用方式 GB/T 7714	Giri S.J.,Swart P.K.. The influence of seawater chemistry on carbonate-associated sulfate derived from coral skeletons[J],2019,521.
APA	Giri S.J.,&Swart P.K..(2019).The influence of seawater chemistry on carbonate-associated sulfate derived from coral skeletons.Palaeogeography, Palaeoclimatology, Palaeoecology,521.
MLA	Giri S.J.,et al."The influence of seawater chemistry on carbonate-associated sulfate derived from coral skeletons".Palaeogeography, Palaeoclimatology, Palaeoecology 521(2019).