Study on Geological Distribution of Fluorine in Forest Aggregate within Korea

Abstract

This study was conducted to investigate the geological distribution characteristics of fluorine in rocks, which can be a major resource of forest aggregates in Korea. Samples of forest aggregates were collected from 224 sites in 22 cities and counties for this study. The national background concentration was 344 ㎎/㎏, which was significantly lower than the average fluorine concentration of crustal, which was 625 ㎎/㎏, and slightly higher than the average fluorine concentration of world soil, which was 321 ㎎/㎏. In terms of region and tectonic structure, fluorine concentrations were investigated to be highest in Gyeonggi-do(394 ㎎/㎏) and Gyeonggi massif(396 ㎎/㎏), respectively. The concentration distribution by the origin of the parent rock was in the order of metamorphic rock(362 ㎎/㎏) > sedimentary rock(354 ㎎/㎏) > igneous rock(328 ㎎/㎏), and the concentration distribution by geologic ages was the highest in the Paleozoic at 394 ㎎/㎏. The concentration distribution by rock types was in the order of diorite(515 ㎎/㎏) > gneisses(377 ㎎/㎏) > schists(344 ㎎/㎏) > phyllite(306 ㎎/㎏) > granites(305 ㎎/㎏) > quartz porphyry(298 ㎎/㎏). Consequently, it is speculated that gneisses and schists, Precambrian metamorphic rocks in the Gyeonggi massif that forms the crust of Gyeonggi-do, contain high fluorine concentrations.