西南日本秋吉带石炭系高山(Ko-yama)灰岩群的褶皱构造

ThestudyareaislocatedinKawakami-cho,OkayamaPrefecture,whichisoccupiedbyLowerCarboniferoustoMiddlePermianKo-yamaLimestoneGroup(Yokoyamaetal.,1979),PermianYoshiiGroup(Sanoetal.,1987)andTriassicNariwaGroup(Tera-oka,1959).TheNariwaGroupunconformablycoversthePaleozoicsuccessions(Otoh,1985).Thesesucces-sionsbelongtotheAkiyoshiBelt.TheKo-yamaLimestoneGroupiscomposedmainlyofmassivelimestone,withbasicvolcanicrocks,acidictuffandchert.Thegroupwasdatedbyforaminiferandfusu-linidasLowerCarboniferoustoMiddlePermian(Yo-koyamaetal.,1979).