【摘要】 在大量岩石薄片鉴定的基础上,对百色盆地东部坳陷北部陡坡带东段古近系那读组砂岩的碎屑组分特征及其物源进行了详细分析。结果表明,那读组砂岩以高成分成熟度、低结构成熟度的细砂岩为主;骨架颗粒与重矿物的特征均显示出那读组砂岩的母岩以沉积岩为主,其次为变质岩,且属近物源沉积;其沉积物主要来自北东向和北西向两个方向的物源供给。更多还原

【Abstract】 The microcosmic characteristics of detrital sediments give an important indication for the provenance of sandstones.The content variation and typomorphic characteristics of the stable fragments and heavy minerals in sandstones can be used to infer the rock type of the provenance and the paleocurrent direction.Based on detailed observation of thin sections,this paper analyzes the textural and compositional characteristics and the provenance of sandstones from the Paleogene Nadu Formation in the north of the eastern depression of the Baise basin.The fine-grained sandstones are dominant in Nadu Formation,with high compositional maturity and low textural maturity.The characteristics of detrital framework grains and heavy minerals show that the sandstones of Nadu Formation are primarily of sedimentary rocks and secondly of metamorphic derivatives,which are not carried for a long distance.The sandstones of Nadu Formation are derived mainly from two source areas lying to the northeast and northwest of the Baise basin.更多还原