摘要
利用岩石薄片和扫描电镜观察以及Ｘ－衍射资料研究了吐鲁番坳陷中上侏罗统碎屑岩中的自生粘土矿物特征，发现碎屑岩中的自生粘土矿物主要有五种类型，即蒙脱石、伊利石－蒙脱石混层、伊利石、绿泥石和高岭石。自生粘土矿物的形成和转化取决于碎屑岩原始矿物组分及其成岩环境。蒙脱石的迅速转化和高岭石的大量析出与碎屑岩的大规模溶解有着密切的关系。根据自生粘土矿物的组合特征，可以有效地确定碎屑岩的成岩阶段及其孔隙发育特征。
The properties of authigenic clay mineral in Upper and Middle Jurassic clastic rock were studied by means of thin sections, scanning election microscope and X-ray diffraction. It is suggested that the authigenic clay mineral in clastic rock may be classified into five types, nemed montmorillonite, mixedlayer of illite and montmorillonite, illite, chlorite and kaolinite. The formation and conversion of authigenic clay mincral were dominated by initial mineral components and diagenetic environment of clastic rock. The rapid conversion of montmorillonite and the mass formation of kaolinite are related to largescale dissolution of clastic rock. The diagenetic stage and poreevolution properties of clastic rock can be effectively determined according to the assemblage of authigenic clay mineral.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第2期258-268,共11页
Acta Petrologica Sinica
关键词
碎屑岩
粘土矿物
成岩意义
吐鲁番坳陷
Clastic rock
Authigenic clay mineral
Diagenesis
Tulufan depression
