米仓山构造带下寒武统筇竹寺组砂岩球状风化特征及成因机制

球状风化发育类型广泛,并且与人们的生产生活息息相关,但是人们对球状风化的研究却相对较少.为进一步研究其发育特征和形成机制,笔者通过薄片鉴定、扫描电镜、X-射线衍射、主量及微量元素分析等实验手段对米仓山构造带下寒武统筇竹寺组砂岩球状风化发育特征及成因机制开展了系统研究.研究表明,米仓山构造带下寒武统筇竹寺组砂岩的球状风化...

Characteristics and formation mechanism of sandstone spherical weathering in Lower Cambrian Qiongzhusi Formation,Micangshan structural zone

Spherical weathering has a wide range of development types and is closely related to people s production and life,but research on spherical weathering is relatively few.In order to further study its characteristics and formation mechanism,the authors conducted a systematic study on the characteristics and formation mechanism of sandstone spherical weathering in the Lower Cambrian Qiongzhusi Formation within the Micangshan structural zone by means of thin section identification,scanning electron microscope,X-ray diffraction,as well as major and trace element analysis.The research shows that the spherical weathering of sandstone in the Lower Cambrian Qiongzhusi Formation from the Micangshan structural zone is influenced by tectonic movement,climate,rainfall and other factors,and the core factors are the stratum lithology,chemical weathering and different weathering of different parts.The formation processes of weathering can be divided into three stages:the formation of the fractures and the division of rock strata,the formation of the nuclear sphere and the peeling of the edge weathered shell.