摘要
在上泥盆统桂林组及融县组灰岩中,钙球是一种重要的组分。根据钙球的形态和内部构造特征,可将其分为原始钙球、均质壳钙球、分异壳钙球及亮晶亮钙球。除原始钙球外,其它三类不但在构造形态方面,存在着继承和发展性,而且在形成环境和形成条件方面,也存在着继承和发展性。钙球,尤其是带壳的钙球,不是生物直接形成,而是灰岩中粒屑演化的产物。
Calcisphere is a common important component in the Upper DevonianGuilin Formation and Rongxian Formation limestones. Based on their shapesand textures the calcisphere is divided into four types: primary calcisphere,homogeneous-crust calcisphere, differential-crust calcisphere and sparry-crust calcisphere. Apart from the former, the other three types possessinheritance and development not only in their shapes and textures but alsoin the environment and condition of their formation. Calcisphere, speciallycrusted calcisphere, is not directly originated by organism, but is the pro-duct of the development of grains in limestone.
关键词
石灰岩
泥盆世
钙球
球形核
桂林
limestone
Upper Devonian
spherical nuclei
Guilin
