摘要
作者根据多年来参与广西煤田地质勘查、科研工作所积累的资料,结合国内当前煤变质理论。以煤炭化学组分及镜质组反射率作为划分煤种及变质阶段的依据,对广西上二叠统的煤种分布规律及煤变质因素进行探讨,根据煤种赋存分布状态,将全区划分为桂中、桂南和桂西三个变质区。后者属单一变质阶段无烟煤区,前二区变质阶段均自北向南逐步增高,形成在E—W方向上稳定分布的各三个变质带。指出深成变质是广西上二叠统煤的主要变质类型,受上覆地层厚度、区域水平挤压力及古地温的控制。
Based on the information accumulated in coal geological survey and scientific research in Guangxi, in combination with the current domestic theory of coal metamorphism, and the devision of coal mark and metamorphic stages by the chemical composition of coal rock and the vitrinite reflectance, the author has discussed the distribution regular of the Upper Permian coal mark and metamorphic factors in Guangsi. According to the pre served distribution stages of coal mark, the author has devided the whole Guangxi into three metamorphic areas such as the central Guangxi, the south Guangxi and the west Guangxi areas. The later belongs to a anthracite area at monometamorphic stage; the former two are at polymetamorphic stages where the metamorphic degrees are gradually getting higher from north to south, three metamorphic belts distributed stably in the east-west direction are formed in the whole region. The author has pointed out that deeply burying metamorphism is the main metamorphic type of Upper Permian coal in Guangsi, which is controlled by the thickness of overlying strata the regional horizontal compressional force and the paleogeotemperature.
