Thermoluminescence of coral skeletons: a high-sensitivity proxy of diagenetic alteration of aragonite.

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 w

SUBMITTER: Takada N 

PROVIDER: S-EPMC5740112 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature