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本文试图通过对房山花岗闪长岩中磷灰石和榍石裂变径迹年龄测定,探讨该岩体的热历史。房山花岗闪长岩所在地区的地质情况,已做过很多工作和报道。该区位于中朝断块内的太行山断隆和华北断陷盆地的交界地带,自中生代晚期以来为相对稳定的隆起和剥蚀区。花岗闪长岩体出露面积达45平方公里,大致分为三个岩相带:边缘带、过渡带和中央带。根据岩体与周围岩层的接触关系和同位素地质年龄测定,确知该岩体的侵位时间应晚于中侏罗世。
This paper attempts to investigate the thermal history of this rock mass by measuring the age of apatite and feldspathic fission in Fangshan granodiorite. The geological conditions of the Fangshan granodiorite area have done a lot of work and coverage. The area is located at the junction of the Taihangshan fault block in the fault block of the North China and the North China fault basin and has been a relatively stable uplift and erosion area since the late Mesozoic. Granodiorite body exposed area of 45 square kilometers, roughly divided into three lithofacies: edge zone, transition zone and the central zone. According to the contact relationship between the rock mass and the surrounding rock strata and the isotopic geological age, it is confirmed that the emplacement time of the rock mass should be later than that of the Middle Jurassic.