CAJ | 학술논문

在鄂尔多斯盆地西北部,中奥陶统桌子山组和马五段到马三段斑状白云岩广泛分布.通过岩石、矿物学及地球化学特征研究,发现该白云岩具有岩溶、生物遗迹、深埋藏的证据,其原岩是早成岩阶段浅埋藏环境下形成的粉晶~细晶白云岩,在晚成岩阶段深埋藏环境下发生差异白云石化,形成细~粉晶白云石组成的斑块.因此,细晶~粗粉晶斑状白云岩受生物影响,是表生岩溶作用和深埋藏环境导致的差异白云石化作用的产物.
재악이다사분지서북부,중오도통탁자산조화마오단도마삼단반상백운암엄범분포.통과암석、광물학급지구화학특정연구,발현해백운암구유암용、생물유적、심매장적증거,기원암시조성암계단천매장배경하형성적분정~세정백운암,재만성암계단심매장배경하발생차이백운석화,형성세~분정백운석조성적반괴.인차,세정~조분정반상백운암수생물영향,시표생암용작용화심매장배경도치적차이백운석화작용적산물.
The Middle Ordovician patchy dolomitite is widely exposed in the Northwest Ordos basin. Lithologic, mineralogical and geochemical studies indicate that the protolith was a crystal powder dolomite-aplite dolomite in the exogenetic stage with patchy aplite dolomite- crystal powder dolomite resulted from differential dolomitization in late diagenetic stage.