合肥盆地中新生代构造演化

综合地质、物探及钻井等资料，通过对合肥盆地的构造演化分析，认为合肥盆地是大别造山带和郯庐断裂带共同作用产生的中新生代残留盆地。受两大构造体系的共同作用，合肥盆地在印支期形成了盆地的基底，中新生代的演化大体可划分为以下5个时期：J1～J2坳陷盆地发育期；J3再生前陆盆地发育期；K1走滑盆地发育期；K2—E断陷盆地发育期；N—Q盆地消亡期。其中，在盆地发育早期受大别造山带影响较大，郯庐断裂作用较小；在盆地发育的中后期，郯庐断裂的影响逐渐成为主导因素。

Mesozoic-Cenozoic Tectonic Evolution of the Hefei Basin

The authors studied the tectonic evolution of Hefei Basin by using an integrated analysis on the geological,geophysical and drilling data. Results show that Hefei Basin is a Mz-Cz residual basin generated by conjunct influence of Dabie Orogeny and Tanlu (Tancheng-Lujiang) Fault Zone. During the early stage of basin development,it was strongly affected by Dabie Orogeny,and during the middle and late stages of basin evolution,the affection of Tanlu faulting gradually became more important. Due to co-affection by the Dabie and the Tanlu tectonic systems,Hefei Basin experienced a series of development stages: the basement stage during the Indosinian event,the depression basin stage during the early-middle Juvassic,the foreland basin stage during the Late Jurassic,the strike-slip basin stage during the Early Cretaceous,the fault basin stage from the Late Cretaceous to the Paleogene,and the basin closure stage from the Neogene to Quaternary.