회남지역(懷南地域) 옥천누층군(沃川累層群)의 변성이질암내(變成泥質岩內)에 분포(分布)하는 바나듐을 함유(含有)한 탄층(炭層)의 지구화학적(地球化學的) 특징(特徵)

Geochemistry of Vanadium-bearing Coal Formation in Metapelite of the Ogcheon Supergroup from the Hoenam Area, Korea

Clay mineral geothermometry using sericites and chlorites in Bobae sericite mine reveals that these clay minerals formed at relatively high temperature. It appears that sericites formed at around $200{\sim}350^{\circ}C$ and chlorites formed at around $250^{\circ}C$. X-ray diffraction study of these minerals reveals that sericite $2M_1$ type and chlorite IIb type are dominant phases. Both polytypes indicate that the precipitation temperatures of these minerals shows fairly good agreement with the estimated temperature by clay mineral geothermometry. The Bobae sericite mine was formed at relatively higher temperature than several non-metal ore deposits occurred in the southern part of Korea.