库车—塔中—塔南剖面磁异常反演与塔里木盆地基底演化

对塔里木盆地库车—塔中—塔南剖面进行磁异常反演，提取异常体的剩磁倾角，结 合古地磁、构造热事件和岩石磁性等资料，研究盆地基底的演化。结果表明，南、北塔里木 地 块经历了不同的热演化史：北塔里木基底主要受早期古生代构造热事件的影响，中央隆起和 南塔里木基底主要受二叠纪构造热事件的影响。在南、北和中区内都有沿深部断裂发育的剩 磁倾角较陡的磁异常体，与火山岩对应。二叠纪之后，地壳相对稳定，盆地基底的演化基本 结束。

Magnetic Anomaly Inversion Of Kuche-Tazhong-Tanan Profile And The Basement Evolution In The Tarim Basin

The study of active time limit (duration) of ductile shear bel t can re veal the important restraining condition of geological event. However, there was no matured method to determine the time duration of ductile structural event di rectly. In this paper we will present some preliminary results of a study aimed to solve this problem based on the chemical and physical information of structur al rocks and stress minerals in the ductile shear belt. A specific dating method , i.e. the structural strain-rate method, has been developed and used in our pr oject. The application of this dating method includes following steps: 　　1. to obtain the strain-rate by calculating the paleo-stress; 　　2. to attain the restrained strain by calculating the volume factor; 　　3. to achieve the time duration of geological event on the base of r estrained strain and strain-rate. 　　The structural strain-rate method has been applied to date the Sushong phosphor o us deposits of ductile shear belt type and a duration time of 1±0.1Ma was obt ained for the ductile shear belt.