安徽庐枞地区中生代火山岩系的时代及其意义

<正> 庐枞地区的中生代火山岩系自老而新分为:龙门院组、砖桥组、双庙组、浮山组。按古生物证据,砖桥组所含瓣鳃类和腹足类化石属晚侏罗世,叶肢介、轮藻、植物与孢粉多为早白垩世组合,介形虫类化石为晚侏罗—早白垩世。地质力学所(1979)、安徽区调队(1979)、南京地矿所岩石组(1978)、地科院地矿所(1978)、贵阳地化所(1977)、安徽地矿局327地质队(1977)等单位均将砖桥组、龙门院组及与其相应地层划归侏罗系上统。刘鸿

Age of the Cenozoic volcanic rock series in the Luzong area of Anhui and its significance

On the basis of geological studies and the determination of Rb-Sr isotopic ages of volcanic intrusives, the authors have proposed that the age of Zhuanqiao Formation in Lujiang -Zongyang district, Anhui Province, is in Late Jurassic, the time of predominant volcanic activities in Lujiang-Zongyang district is earlier than that in Nanjing-Wuhu district. The major regular pattern of the volcanic activities in southeastern China and their causes have been discussed.