马站盆地成因与晚白垩世郯庐断裂带的活动性

THE ORIGIN OF THE MAZHAN BASIN AND ITS RELATIONSHIP TO THE TAN LU FAULT ZONE

通过对郯庐断裂带内马站盆地中沉积岩相和同沉积构造分布特征的详细研究及盆地内凝灰岩夹层中的锆石裂变径迹年龄测定和盆内化石的研究，认为该盆地是一个形成于晚白垩世并与郯庐断裂带活动有关的走滑盆地。该盆地的形成表明郯庐断裂带，至少是其一部分，在晚白垩世时期仍存在明显的走滑活动。

Detailed investigation on the lithofacies and the syn sedimentary structures in the basin as well as the determination of the fission track ages of zircons from two tuff layers and of the fossils collected in the basin indicates that the Mazhan Basin is a typical Late Cretaceous strike slip basin related to the Tan Lu Fault Zone,which suggest that the Tan Lu Fault Zone,at least part of it,had undergone a notable sinistral strike slip during Late Cretaceous.