摘要
淮南下石盒子组球粒状高岭岩形成于三角洲平原上的湖泊环境。球粒是有机质与高岭石组成的复合集合体，可划分出６种结构类型。矿床中高岭石矿物主要有两种来源，一种是由陆源粘土搬运再沉积而成；另一种是由硅铝胶体沉淀并经重结晶作用而来。有机质对高岭石及球粒集合体的形成起重要作用。
he kaolinite rock, 2-6 m thick, occurs 6-19 m below NO. 4 coal seam at the bottom of Xiashihezi Formation, being a stable correlation key bed in a large area. The pelletoid kaolinite rock, formed in the lacustrine environment of delta plain, is an important type of rock. Six texture types of pellets are identified: Concentric pellets without nuclei, pellets with nuclei, radial pellets, laminae-free pellets,irregular pellets, transitional pellets. Organic matter, derived from strong degradation of algae, are amorhpous and yellow-green under fluorescence, and play a great role in the formation of pellets. The clay particles suspended in the water are linked by organic matter, forming aggregates, then sinking and rolling under the influence of water current on the bottom of basin, thus forming various types of pellets. The concentric texture is also related to the seasonal change. There are two genetic kinds of kaolinite: One is the terrigenous clay minerals, transported and deposited in the lacustrine basin, which show rounded and irregular shape, The other is precipitated by alumino-silicate gels and recrystallized in the diagenesis stage, which show radial arrangment and well hexagonal flake shape.
出处
《地质科学》
CAS
CSCD
北大核心
1995年第4期393-400,T001,共9页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金
关键词
高岭岩
球粒
有机质
石盆子组
成因
Kaolinite rock, Texture, Pellet, Organic matter
