摘要
长冲叶蜡石呈似层状产于下二叠统梁山组底部的粘土岩中,共分上、下两层矿。矿区中部矿层较厚,向东、西两端逐渐变薄。样品经X射线衍射分析,确认为三斜叶蜡石(即1Tc型),经化验以及电子探针定量分析表明属高铝叶蜡石(Al_2O_3≥25)。叶蜡石普遍具细—粉砂结构假象,常见石英残晶,边缘被叶蜡石交代、溶蚀,说明石英——假象叶蜡石为先后交代关系。结合矿区内无火成岩、火成活动、变质现象等,故初步认为长冲叶蜡石矿是由含粘土质的石英粉砂岩在成岩后期,经含叶蜡石矿的地下热水溶液交代、改造而成。
The Changchong Pyrophyllite in the shape of layers occurs in clay rocks at the bottom of Liangshan formation in Lower Permian. It is divided into upper and lower ore beds. The ore bed in the middle part of the depositional area is thicker and gradually becomes thinner towards both east and west. The samples, through X-ray diffraction analysis, are affirmed triclinic pyrophyllite (1TC Type), through chemical examinations and electron probe quantitatve analysis, the samples are determined to be high-alumina pyrophyllite(A1203≥25). Pyrophyllite is generally in false fine powder textures, with quartz remnant cyrstal commonly seen and edges replaced and corroded by pyrophyllite, showing quartz and pseudo-pyrophyllite bear relations of early or late replacement. Considering that there were no igneous rocks, no igneous activities or no metamorphic phenomena, etc. , the Changchong pyrophyllite ore is preliminarily considered to be formed by the clay-bearing quartz powder rocks, which were replaced and transformed by the pyrophyllite-bearing ground hot water solution in the later period of rock formation.
出处
《贵州地质》
1991年第1期45-53,共9页
Guizhou Geology
