骊山凸起隆升的时限及其地质意义

TIME LIMIT OF LISHAN UPLIFT AND ITS GEOLOGICAL SIGNIFICANCE

根据渭河盆地灞河期和游河期的地层沉积特征及分布范围,推断骊山凸起的隆升时期为晚中新世,游河期渭河盆地形成了西安凹陷和固市凹陷两个沉积中心,现今渭河盆地凸起和凹陷的并存的地貌格局很可能自晚中新世就已经形成。渭河盆地周缘在8Ma左右存在一次强烈区域隆升事件,对秦岭的隆升有显著影响。

Based on stratigraphic sedimentation and distribution in the Weihe Basin during the Bahe and Youhe periods,it is inferred that the uplift period of Lishan uplift was Late Miocene.Two sedimentary centers,Xi’an Sag and Gushi Sag,were formed in the Weihe Basin during the Youhe Period.The coexistence of uplift and depression in the Weihe Basin might be formed in the late Miocene.There was a strong regional uplift event present around the Weihe Basin at about 8Ma,which has a significant impact on the uplift of the Qinling Mountains.