Abstract
Abstract The distribution and the mode of occurrence of fluorine in Holocene (mainly high-Mg calcite), Pleistocene (low-Mg calcite), and Paleozoic (low-Mg calcite) limestones of Yoron-jima Island were investigated, and the geochemical behavior of F during the formation of Pleistocene limestones is discussed. The average F contents of Holocene (n = 3), Pleistocene (n = 20), and Paleozoic (n = 8) limestone samples are 680, 99, and 45 ppm, respectively, showing a marked decrease of this element during early diagenetic processes of marine carbonates. A positive correlation between the F and Mg contents of Pleistocene limestones indicates that F might have been removed together with Mg2+ from high-Mg calcite into interstitial waters during these processes. A main mode of occurrence of F (about 50%) in Pleistocene limestones is confirmed to be carbonate fluorapatite (francolite), and the rest is thought to be fluorite.
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