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一、非海相化石群的特征 (一)绪言 煤系中的非海相动物群通常赋存在页理程度发育不同的细粒沉积岩中。本文将页理发育的岩石称页岩,无页理的细粒沉积岩称泥岩,二者之间过渡类型的岩石称页质泥岩。页岩一般色泽暗黑,含丰富的有机物质。而由粘土矿物组成的泥岩一般含有较多的混入物(如石英颗粒)。细粒沉积岩产生页理的原因有很多,许多研究工作者曾专门探讨过。其中粘土矿物在岩石中呈平行排列是形成页理原因之一。但根据X-衍射仪的分析,兰开夏煤系中页岩页理的成因与此无关。下列二点因素可能起着很大作用;(1)大量植物碎屑沿岩层层面平行排列。(2)岩石中矿物成分沿纵向规律地变化。
Characteristics of Non-Marine Fossil Fossils (I) INTRODUCTION Non-marine fauna in coal measures are usually found in fine-grained sedimentary rocks with different developmental degrees. In this paper, the physical development of the shale is called shale, fine grained sedimentary rock called mudstone, the transitional type of rock called page mudstone. Shale generally dark color, rich in organic matter. Mudites composed of clay minerals generally contain more inclusions (eg, quartz particles). There are many reasons why fine-grained sedimentary rocks can be found, and many researchers have specifically explored them. Among them, clay minerals are arranged in parallel in the rock is one of the reasons for the formation of the page. However, according to the analysis of X-ray diffractometer, the origin of the shales in the Lancashi coal measures has nothing to do with this. The following two factors may play a significant role; (1) a large number of plant debris parallel to the rock formation level. (2) Mineral composition in the rock changes regularly and vertically.