摘要:
我国早二叠系沉积有海相和陆相,沉积面积占全国总面积的81%。未接受沉积的古陆和古岛仅占19%,其中海相沉积占80%,平均厚度约600米;陆相占20%,平均厚度约300米,沉积岩总体积约400—450万立方公里。海相地层中发育着大量的生物群,在碳酸盐岩为主的地区生物含量40%以上的地层占41%,最高的可达84.8%,基本上是含生物灰岩。生物种类繁多.有:珊瑚、腕足类、苔藓虫、有孔虫、棘皮类、斧足类、头足类、三叶虫、介形类、海绵、鱼类以及大量的各种藻类。在陆相地层中含大量的植物,有各种羊齿、轮木、芦木等化石群。
Abstract:
The sedimentary rock area of the Early Permian system makes up about 81% of the total area of China, in which sedimentary rocks of sea facies account about 80%, To the south of 40°N, carbonates predominate with rich biota of sea facies as well as bioherm; while to the north of 40°N are the detrital rocks. The area of land facies accounts for 20% and it is chiefly distributed in the ancient land of China.
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