气候变化领域集成服务门户(CCPortal): A record of the δ44/40Ca and [Sr] of seawater over the last 100 million years from fossil elasmobranch tooth enamel

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DOI	10.1016/j.epsl.2020.116354
	A record of the δ44/40Ca and [Sr] of seawater over the last 100 million years from fossil elasmobranch tooth enamel
	Akhtar A.A.; Santi L.M.; Griffiths M.L.; Becker M.; Eagle R.A.; Kim S.; Kocsis L.; Rosenthal Y.; Higgins J.A.
发表日期	2020
ISSN	0012821X
卷号	543
英文摘要	The global geochemical cycles of calcium and strontium in seawater link the chemical composition of the oceans to the global carbon cycle and Earth's climate through the precipitation, diagenetic alteration, and sedimentary recycling of marine carbonate minerals. Here we present a record of calcium isotopic composition and [Sr] of seawater over the last 100 million years using measurements from modern and fossil shark teeth. Although there is significant variability in modern elasmobranch tooth enamel associated with physiology and diet, our record suggests a first-order increase in the average calcium isotopic composition of seawater by 0.5‰ and a decline in Sr/Ca ratios of ∼40% over the last 100 million years. These observations are in agreement with trends seen in other archives. We propose that the observed changes in both the calcium isotopic composition and Sr concentration of seawater can be explained by changes in the partitioning of the global carbonate sink associated with the development of a deep-sea carbonate reservoir in the mid-Mesozoic. © 2020 Elsevier B.V.
关键词	Calcium isotopes elasmobranch teeth marine calcium cycle seawater chemistry Sr/Ca
英文关键词	Calcium; Carbonation; Earth (planet); Enamels; Geochemistry; Isotopes; Tooth enamel; Carbonate reservoir; Carbonate sinks; Chemical compositions; Diagenetic alteration; Earth's climate; Global carbon cycle; Global geochemical cycles; Isotopic composition; Seawater; calcium; enamel; fossil record; isotopic composition; paleogeography; seawater; shark; strontium; Chondrichthyes
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202467
作者单位	Department of Geosciences, Princeton University, Princeton, NJ, United States; Institute of Environment and Sustainability, University of California, Los Angeles, CA, United States; William Paterson University, Wayne, NJ, United States; Atmospheric and Oceanic Sciences Department, Ecology and Evolutionary Biology Department, University of California, Los Angeles, CA, United States; University of California Merced, Department of Life and Environmental Sciences, Merced, CA, United States; Geology Group, Faculty of Science, Universiti Brunei Darussalam, Brunei Darussalam; Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, United States
推荐引用方式 GB/T 7714	Akhtar A.A.,Santi L.M.,Griffiths M.L.,et al. A record of the δ44/40Ca and [Sr] of seawater over the last 100 million years from fossil elasmobranch tooth enamel[J],2020,543.
APA	Akhtar A.A..,Santi L.M..,Griffiths M.L..,Becker M..,Eagle R.A..,...&Higgins J.A..(2020).A record of the δ44/40Ca and [Sr] of seawater over the last 100 million years from fossil elasmobranch tooth enamel.Earth and Planetary Science Letters,543.
MLA	Akhtar A.A.,et al."A record of the δ44/40Ca and [Sr] of seawater over the last 100 million years from fossil elasmobranch tooth enamel".Earth and Planetary Science Letters 543(2020).