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• W2774988367 abstract "Diagenetic alteration of aragonite coral skeletons causes changes in their chemical and isotopic compositions. Such altered coral samples are unsuitable for age dating or paleoclimate reconstructions. Recently developed microanalysis techniques have elucidated secondary aragonite precipitation and calcite overgrowth on primary aragonitic coral skeletons, but an effective screening method for bulk samples is still desirable. Although powder X-ray diffraction (XRD) analysis is widely used for this purpose, its detection limit for calcite (1-2% at best) is not sufficient to detect very small amounts of diagenetic calcite. Here, we propose that thermoluminescence (TL) spectra can be used to detect the presence of tiny amounts of secondary calcite in coral skeletons. We used a TL spectrometer with a Fourier-transform detector to detect the calcite component in TL spectra of powdered skeletons of modern and fossil corals (from 127 ka and 3.5 Ma) in which calcite was not detectable by XRD. The key element is manganese, because the TL emission efficiency and the partition coefficient of Mn are greater for calcite than for aragonite. As a result, the calcite spectral component becomes evident. Thus, the TL spectroscopic technique is a highly sensitive tool for screening fossil corals for diagenetic alteration." @default.
• W2774988367 created "2017-12-22" @default.
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• W2774988367 date "2017-12-01" @default.
• W2774988367 modified "2023-10-12" @default.
• W2774988367 title "Thermoluminescence of coral skeletons: a high-sensitivity proxy of diagenetic alteration of aragonite" @default.
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• W2774988367 doi "https://doi.org/10.1038/s41598-017-18269-y" @default.
• W2774988367 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5740112" @default.
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• W2774988367 hasPublicationYear "2017" @default.
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