福建基底时代的探讨

DISCUSSION ON THE AGE OF THE BASEMENT IN FUJIAN

福建震旦系与前震旦系之间发现有不整合界面,在不整合界面之下的麻源群和建瓯群迪口组测得地质年龄1800～2700百万年,建瓯群龙北溪组测得地质年龄868～1040百万年,在不整合面之上的震旦系测得地质年龄604～649百万年,最近陆续公布有邻省浙江和东海-南海大陆架及其岛屿都测得有类似的地质年龄,表明包括浙、闽、粤和东海-南海大陆架及其岛屿在内存在一个原始大陆。这个原始大陆从福建地质构造分析认为,原来不在现在的地方,是由南边漂移而来。

It was discovered that unconformity existed between Pre-sinian and Sinian.The isotopic age of Mayuan Group andDikou Formation of Jian'ou Group under the unconformity is 1 800～2 700Ma,and that of Longbeixi Formation ofJian'ou Group is 868～1 040 Ma,but the isotopic age of Sinian Systern overlaid the unconformity is 604～649Ma.Theisotopic age recently document from the neiphboring area,such as Zhangjiang province and continental shelf of Eastsea-Southsea and some island,is similar to that of Fujian.It is suggested that there was a protocontinent occupyingZhangiiang,Fujian,and Guangdong provinces as well as the continental shelf of Eastsea-Southsea and some islands.Byanalysing the geological tectonic of Fujian province we consider that the orginal position of the protocontinent was not insite,may be it drifted from the south。