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浙江临安上奥陶统于潜组和张村坞组为一套砂泥陆屑岩石组成的海相地层,该地层具浊流沉积性质。本文侧重研究两组砂泥岩中的粘土矿物,亦发现可证实浊流沉积的某些特征:1.泥岩中的粘土矿物虽经压实但多数分布杂乱,可能与紊流掀动有关;2.砂泥岩中可见少量碎屑高岭石(<5％)和碎屑伊利石,可能与高速浊流带入较深水快速埋藏以及岩石孔渗性差等因素有关;3.岩石内的粘土矿物组合是伊利石、绿泥石、高岭石以及蒙脱石,反映陆棚远岸区特点。
The Upper Ordovician in Lin’an, Zhejiang Province is a marine facies composed of sand-shale and continental litter in the Sub-formation and Zhangcunwu formation, which has the characteristics of turbidity-flow sedimentation. This paper focuses on the study of clay minerals in two groups of sandstone and mudstone and also finds some characteristics that can confirm the turbidity flow deposition: 1. Although the clay minerals in mudstone are compacted, most of the distribution is messy, which may be related to the tilt of turbulence; A small amount of clastic kaolinite (<5%) and detritus illite can be seen in the sandstone and mudstone, which may be related to the rapid burial of high-velocity turbidite into deeper water and poor porosity and porosity of the rock. 3. The clay mineral assemblage in the rock is Illite, chlorite, kaolinite and montmorillonite, reflecting the characteristics of continental shelf far off the coast.