广东二叠纪火山事件地层学研究

Study on the Permian Volcanic Eventstratigraphy In Guangdong Province

广东二叠纪曾发生两期规模较大的火山喷发事件。第一期发生在茅口期与吴家坪期之间，影响范围涉及粤中、粤西等地；第二期主要发生于长兴期，可细分为 3次喷发，其中最后一次于二叠纪末、三叠纪初发生，在粤东、粤北、粤西北均有影响，规模最大。伴随两期火山喷发，生物发生显著的更替和绝灭，并且形成的岩石等时性强、对比精度高。系统研究火山事件的岩石学特征、生物绝灭效应、火山喷发成因，对建立广东二叠纪年代地层单位，厘定粤中、粤西地区的茅口阶与长兴阶、二叠系与三叠系的界线均有重要的理论和实际意义。

During the permian period there occurred two extensive volcanisms in Guangdong. The lst time took place between the stages of Maokou and the Wujiaping, and infleuenced in the central and western Guangdong. And the 2nd time mainly occurred during the Changxingian,and three eruptions can be recognized. Of which the latest one, that is the most extensive one and occurring between the latest Permian and the earliest Triassic; mainly infleuenced the Eastern, Northern and Northwestern Guangdong. These volcanisms had an outstanding effects on the biotic extinction and the volcanic material of each eruption scattered over the whole Guangdong have an high correlatability. Therefore, systematic researches into the lithology. biotic extinction effects, geneses of volcanisms have an important theoretic and actual significance in establishing the Permian chronostratic units of Guangdong and defining the boundary between the Maokouan and Wujiapingian in the central and western Guangdong; and the boundary between the Wujiapingian and the changxingian and Permian－ Trissic boundary in the Eastern, Northern and Northwestern Guangdong Province.