Host: Abstracts of Annual Meeting of the Geochemical Society of Japan
Pages 28-
Carbonates are common minerals through geologic time, and carbonate geochronology provides time constraints on evolutional history of organisms, paleoenvironmental changes, tectonic events, and subsurface fluid-flow changes. Application of in situ U-Pb dating method to carbonates has been limited by the lack of carbonate reference materials with homogeneous U and Pb concentrations and isotopic compositions. In this study, we tried to synthesize a new calcite reference material with homogeneous elemental and isotopic compositions. The calcites were synthesized by heating amorphous calcium carbonates precipitated with a dopant solution containing U, Pb, and rare earth elements with known Pb isotopic composition. The elemental and isotopic homogeneity of the synthetic calcite was evaluated using laser ablation inductively coupled plasma mass spectrometry.
