【摘要】 <正> 我国著名的活火山之一,东北的五大莲池火山群以其保存完好的熔岩地貌,甘美爽口的矿泉和优雅秀丽的景色为世人所向往,具独特的富钾火山熔岩更吸引岩石工作者的关注。本文就五大莲池及毗邻地区所产的一套富钾火山熔岩的归属问题给出一管之见,以期引起人们的重视和讨论。 (一) 由于环太平洋火山带的作用,东北地区新生代火山岩十分发育。据现有资料,产于辽宁宽甸、吉林敦化、黑龙江镜泊湖以及大兴安岭的新生代火山岩,基本为碧玄岩——碱性橄榄玄武岩;在长白山天池,岩石组合为橄榄玄武岩——碱性粗面岩——碱流更多还原

【Abstract】 The cenozoic volcanic rocks are distributed widely in Northaeast China. A suite of potash-rich lava was erupted successively in Pliocene, Mid-pleistocene and Holocene, and three volcanic groups （kelo, wudalianchi and Erke）were formed. The chemical composition of these rocks are characterized by the following contents: K₂O+Na₂O>8％;K₂O>4％;K₂O/Na₂O>1％, TiO₂>2％; P₂O₂>1％. The contents of MgO and CaO decreased, and that of alkali and silica increased accompaning eruptive stages. It is indicated that the lavas from the different stages possess the mutual genetic relationship and is comparable with the well—known potashrich volcanic rocks found in continental environment throughout the world. According tothe analysis of more than 200 chemical data, the authors proposed that the potash—rich volcanic lava in Northeast China is a assemblage of leucitite—leucite trachyte—leucite phonolite and can be interpreted as a evolutional example of potash—rich liquidity located in a Di—Ne—Ks—SIL tetrahedron of the alkali rock. Therefore, the lavag in Northeast China were probably derived from a parental potash—rich magma.更多还原