从粘土矿物的转变讨论沉积成岩到变质过程中的阶段划分

在沉积岩中粘土矿物是分布最广的一种矿物,它不仅存在于占沉积岩70%以上的泥岩及页岩中,而且在砂岩、石灰岩……等沉积岩中也有一定的含量,因而对粘土矿物在成岩作用过程中的转变的研究就具有普遍意义。粘土矿物这一质点性层状硅酸盐,对地球化学环境的变化的反映又十分敏感,因而选择这类矿物的转变,作为标志是十分理想的;而这些标志又直接或间接指示着生油成气的成熟度。

ON THE DIVISION OF DIAGENESIS STAGES ACCORDING TO THE TRANSFORMATION OF CLAY MINERALS

This paper discusses the regularity of evolution of clay minerals during the process starting from sedimentation,diagenesis to metamorphism.Because of the difference in measuring conditions of different X-ray diffractions,it is difficult to compare data obtained when taking the peak width of illete as half of 10Å reflections (Kubler,1966) as the crystallinity indexes.So the authors propose the opening index of illite instead of Kubler's index,that is,to take N