海南抱板群同位素年龄及其地质意义

THE ISOTOPIC AGESOF THE BAOBAN GROUP IN HAINAN AND ITS GEOLOGICAL SIGNIFICANCE

摘要: 本文报导了海南岛中部抱板群中的变火山岩Sm-Nd等时线年龄为975±8.6Ma,结合已知U-Pb和谐曲线年龄1401±23Ma,初步认为抱板群为一套复理石火山—沉积建造,时代属中元古代,是华夏古陆的组成部分。

Abstract: Metavolcanic rocks in the Baoban Group in the central part of Hainan Island have a Sm-Nd isochron age of 975+8.6 and a U-Pb concordia age of 1401+23 Ma. It is preliminarily considered that the Baoban Group is a flysch volcanic-sedimentary formation of Middle Proterozoic age, which is a component part of Cathaysia.