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石炭纪—二叠纪旋回层是由晚古生代冈瓦纳冰川的冰期与间冰期的交替而造成的海进—海退循环沉积的层序,出现在全球尤其是北半球的很多地区。根据岩石微相和沉积构造特征,安徽巢湖凤凰山石炭系和州组,可识别出5个海进—海退沉积序列;根据和州组中有孔虫的分布特征,自下而上可分为5个有孔虫带,确定其地质年代是从维宪期晚期到巴什基尔期早期。这5个海进—海退沉积旋回,与华南其他地区和欧美地区的同时代地层中出现的大的海进—海退事件基本一致。
The Carboniferous-Permian cyclonic layer is a sequence of marine-transcendental sedimentary cycles caused by the alternation of glacial and interglacial periods of the Late Paleozoic Gondwan Glacier, appearing in many parts of the world, especially in the northern hemisphere. According to the characteristics of rock microfacies and sedimentary structure, the Carboniferous and State formations in Fenghuangshan, Chaohu, Anhui Province, five seaward-receding sedimentary sequences can be identified. According to the distribution characteristics of foraminifera in Hezhou Formation, it can be divided from bottom to top Five foraminiferal belts, to determine the geological age from the late Vishnu to early Bashkir period. These 5 sea-ocean regression sedimentary cycles are basically in line with the major sea-retreat in the contemporaries in other areas of South China and Europe and the United States.