摘要
<正>众所周知,统一的华南板块由扬子和华夏两大块体拼合而成,但其拼合时限一直广受争议。一种观点认为陈蔡群、麻源群和马面山群等出露的铁镁质-超铁镁质岩石形成时间为860-830Ma,形成于扬子与华夏碰撞后陆内拉张的裂谷环境,扬子与华夏在860Ma即完成拼合(如Shu et al,2001);另一种观点认为江南地区及华夏零星地区广泛存在新元古代岩浆弧,形成时间从970Ma到830Ma,扬子与华夏的拼合时间约为830-820Ma,其中陈蔡群原岩为880Ma-840Ma的岛弧岩浆活动的产物(如Wang et
引文
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