贵州盘县羊槛地区安尼锡克中期凝灰岩的发现及其意义

本文在简要描述新发现于盘县羊槛地区凝灰岩产出的地质、岩石学和岩石化学特征的基础上，认为它是产于中三叠世安尼锡克中期的中性火山碎屑岩，属半局限台地环境的远火山口相产物。这对研究该时期火山活动及其产于该层位的海生爬行动物和鱼类等珍稀化石的生态和环境等都具有重要意义。

Discovery on the Tuff of the Middle Anisian Stage in the Yangkan Area, Panxian, Guizhou and Its Significance

This paper portrays the occurrence characteristic of geology, petrology and petrochemistry in the tuff of new discovery in the Yangkan area, Panxian, it is thought that its occurrence in neutral pyroclastic rocks of the middle Anisian stage of the middle Triassic, and is the product of distal volcanic vent facies in the setting of semi-limit platform. It is greatly significant either to the research of the temporal volcanic activity or the envi-ronment of the rare fossils of the marine reptiles and fish in the layer.