A record of the δ44/40Ca and [Sr] of seawater over the last 100 million years from fossil elasmobranch tooth enamel

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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过去 1 亿年软骨鱼牙釉质化石中海水的 δ44/40Ca 和 [Sr] 记录

DOI:
10.1016/j.epsl.2020.116354
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发表时间:
2020
影响因子:
5.3
通讯作者:
Higgins, John A.
Higgins, John A.
中科院分区:
地球科学1区
文献类型:
--
作者:
Akhtar, Alliya A.;Santi, Lauren M.;Griffiths, Michael L.;Becker, Martin;Eagle, Robert A.;Kim, Sora;Kocsis, László;Rosenthal, Yair;Higgins, John A.

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海水中钙和锶的全球地球化学循环通过海洋碳酸盐矿物的沉淀、成岩蚀变和沉积再循环将海洋的化学组成与全球碳循环和地球气候联系起来。在这里,我们提出了一个记录的钙同位素组成和[Sr]的海水在过去的1亿年中使用现代和化石鲨鱼牙齿的测量。尽管现代板鳃类牙齿釉质与生理和饮食有关,但我们的记录表明,在过去的1亿年里,海水的平均钙同位素组成一级增加了0.5‰,Sr/Ca比值下降了1.40%。这些观察结果与其他档案中看到的趋势一致。我们建议,所观察到的钙同位素组成和锶浓度的海水中的变化,可以解释与发展中中生代深海碳酸盐储层的全球碳酸盐汇的分区的变化。
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.
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