Abstract
Stable isotopic composition of biogenic carbonates has been playing an essential role to understand Earth's history. Conventional "isotope" studies are based on the determination of atomic ratios for sample materials such as 13C/12C, 18O/16O, etc. Although there are doubly-substituted isotopologues in nature, suck as <13>C<18>O<16>0, they had never been measured until recently.The clumped isotope study, which is based on the determination of these isotopologue ratios, is a promising tool for paleothermometry where hydrological environment is ambiguous. In this paper, we present the principle, how to measure, some results using biogenic carbonates of clumped isotopes as well as perspectives.
