鲁西隆起晚白垩世—新生代差异抬升的裂变径迹证据

裂变径迹测年技术用于确定伸展山脉的隆升时间， 进而可以研究伸展构造的演化规律。 对采自鲁西隆起中部莲花山的 9 个样品进行了磷灰石/锆石裂变径迹分析， 结合已有数据分析鲁西隆起的抬升史。 结果表明莲花山晚白垩世以来经历了两期抬升剥露过程， 一次是在晚白垩世—古新世初期 86～60 Ma， 抬升速率为 0.019 mm/yr， 另一次是在中始新世 44～38 Ma， 抬升速率为 0.10 mm/yr。 因此， 莲花山晚白垩世以来经历了加速抬升剥露过程。 综合研究认为， 鲁西隆起山脉晚白垩世以来具有自南而北、由东向西的差异抬升规律， 且最早可能始于早白垩世。 这种迁移规律受控于早白垩世以来太平洋板块俯冲方向和速度， 以及郯庐断裂带的走滑性质和强度的变化。

Fission track evidence of Late Cretaceous-Cenozoic differential uplifting of the Luxi uplift

Fission track dating is used to determine the uplift time of the extended mountain range, and then the evolution rule of the extensional structure can be studied. The apatite/zircon fission track analysis was carried out on nine samples collected from the Lianhuashan Mountain in Luxi, and the uplift history of the Luxi uplift was analyzed. The results show that there are two processes of uplift and exhumation since the Late Cretaceous in Lianhuashan, one in the Late Cretaceous-Early Paleocene 86～60 Ma, the uplift rate is 0.019 mm/yr, the other is in the Middle of the Miocene 44～38 Ma, uplift rate of 0.10 mm/yr. Therefore, the Lianhuashan Mts. has experienced accelerated lifting process since the Late Cretaceous. The comprehensive study suggests that the uplifting time of these mountains in the Luxi uplift since the Late Cretaceous migrate from south to north and from east to west, and the earliest may begin in the Early Cretaceous. This migration rule is controlled by the subduction direction and velocity of the paleo-Pacific Plate since the Early Cretaceous and the variation of the strike-slip property and intensity of the Tan-Lu fault zone.