鲁西北西向断裂系晚中生代活动的几何学、运动学及年代学研究

Geometry,Kinematics and Thermochronology Study of the Late Mesozoic Movement of NW-Trending Faults,Western Shandong

鲁西隆起区发育有大量的北西向脆性断裂。依据野外断裂构造的几何学、运动学详细解析，认为北西向断裂系经历了早期的右行压剪、右行张剪，以及后期的左行压剪等不同性质的构造活动。由与北西向断裂活动相伴生的同期侵入岩体的K—Ar测试结果分析，北西向断裂系在距今约160Ma及距今130110Ma分别经历了右行压剪与右行张剪构造活动；通过分布在隆起区不同样品的磷灰石裂变径迹数据分析、冷却史反演，厘定鲁西地体在距今90-80Ma存在一次区域性快速冷却构造事件，该构造事件与北西向断裂系的左行压剪构造活动相对应。

A great number of the North-West （NW）brittle faults developed in the uplift of West Shandong. Based on field observation and detailed geometric and dynamic analysis, it is believed that the NW faults had experienced various tectonic activities such as transpressional dextral strike-slip and transtensional dextral strike-slip at the early stage, and transpressional sinistral strike-slip at the late stage. K-Ar dating for contemporaneous intrusion rock related to the NW-trending faulting also shows that the NW-trending faulting underwent transpressinal dextral strike-slip motion and transtensional dextral strike-slip at 160 Ma and 130 - 110 Ma respectively. Apatite fission track data of various samples from the whole uplift, combined with inverse modeling of cooling history, show that there was a fast cooling event occurring the block in western Shangdong in 90-80 Ma. This event was coupled with transpressional sinistral strike-slip of the NW faults.