【摘要】 裂陷盆地岩浆活动可以反映盆地形成演化与深部动力演变过程 ,因此建立裂陷盆地同裂陷期火山岩活动序列并对其进行地球化学示踪是伸展裂谷盆地动力学研究的有效途径之一。在对南堡凹陷第三系火山岩分布、类型及其地球化学特征分析的基础上 ,认为该区第三系发育两种类型的火山岩演化序列 ,即局部裂陷型火山岩活动演化层序和区域伸展扩张型火山岩活动演化层序。不同类型的火山岩演化序列具有不同的地球化学演化特征 ,代表了不同时期岩石圈减薄及演化过程的差异。图 3表 4参 6更多还原

【Abstract】 Deep dynamic processes and evolution of a rift basin could be determined by studying the magmatic evolvement within it, and establishing active sequences of volcanic rocks and to tracing their geochemical characters should be one of the efficient and useful tools for studying the dynamics of an extensive rift basin. According to the comprehensive analyses and studies of the distribution, type and geochemical characters of the Tertiary volcanic rocks in the Nanpu sag, two types of the evolvement could be identified, that should be a local rift type of evolvement sequences of and a regional extensive volcanic rock, representing the differences of decrease of lithosphere and evolvement process.更多还原