Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 543, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2020.116354
Keywords
calcium isotopes; Sr/Ca; elasmobranch teeth; marine calcium cycle; seawater chemistry
Categories
Funding
- Scott Vertebrate Paleontology Fund (Princeton University)
- National Science Foundation Sedimentary Geology and Paleobiology Award [1830581, 1830480]
- American Chemical Society Award Petroleum Research Fund Undergraduate New Investigator Grant [54852-UNI2]
- Directorate For Geosciences
- Division Of Earth Sciences [1830480] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1830581] Funding Source: National Science Foundation
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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 parts per thousand and a decline in Sr/Ca ratios of similar to 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. (C) 2020 Elsevier B.V. All rights reserved.
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