对江西中部寨里火山岩的新认识

New understandings of Zhaili volcanic rock in the center ofJ iangxi

摘要: “寨里火山岩”是江西中部的一个重要基础地质问题,对于它的属性及时代争议颇多。本次1∶5万洛市幅区域地质调查时,在原寨里火山岩中分辨出新元古代青白口纪早期潭头群田东组海相火山岩和中生代晚侏罗世余田群菖蒲组陆相火山岩,分别测得锆石UPb年龄（1027±36）Ma和大于（99.4±3.2）Ma。

Abstract: ThestudyonZhailivolcanicrockinthecenterofJiangxiisanimportantbasicgeologi calquestion .Thereexistmanyviewsonitscharacteristicsandage.Themarinevolcanicrockof TiandongFormationofTantouGroupofearlyQingbaikouperiodinUpperProterozoic,andthe LandvolcanicrockofChangpuFormationofYutianGroupinLateJurassicinMesozoicErawere foundinthepreviousZhailivolcanicrock ,andU Pbisotopedatingfromzirconofwhichyields agesof （1 0 2 7± 3 6）Ma,＞（99.4± 3 .2 ）Ma ,respectively .