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- W2912800743 abstract "Abstract Isolated spherical carbonate concretions are frequently observed in finer grained marine sediments of widely varying geological age. Recent studies on various kinds of spherical carbonate (CaCO 3 ) concretions revealed that they formed very rapidly under tightly constrained conditions. However, the formation ages of the isolated spherical carbonate concretions have never been determined. Here we use 87 Sr/ 86 Sr ratios to determine the ages of these spherical concretions. The studied concretions formed in the Yatsuo Group of Miocene age in central Japan. Some formed post-mortem around tusk-shells ( Fissidentalium spp.), while other concretions have no shell fossils inside. The deformation of sedimentary layers around the concretions, combined with geochemical analyses, reveal that Sr was incorporated into the CaCO 3 concretions during their rapid formation. Strontium isotopic stratigraphy using 87 Sr/ 86 Sr ratios of all concretions indicates an age of 17.02 ± 0.27 Ma, with higher accuracy than the ages estimated using micro-fossils from the Yatsuo Group. The results imply that the 87 Sr/ 86 Sr ratio of isolated spherical carbonate concretions can be applied generally to determine the numerical ages of marine sediments, when concretions formed soon after sedimentation. The 87 Sr/ 86 Sr age determinations have high accuracy, even in cases without any fossils evidence." @default.
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- W2912800743 date "2019-01-30" @default.
- W2912800743 modified "2023-09-24" @default.
- W2912800743 title "87Sr/86Sr age determination by rapidly formed spherical carbonate concretions" @default.
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- W2912800743 doi "https://doi.org/10.1038/s41598-019-38593-9" @default.
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