朱阳关-夏馆断裂带构造变形的温压条件  

Temperature and pressure conditions of tectonic deformation of Zhuyangguan-Xiaguan fault belt

作　　者：张欢[1] 宋传中[1] 王道轩[1] 任升莲[1] 涂文传[1] 李加好[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2012年第8期1101-1105,1144,共6页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(40372097;40772131);中国石化基础研究资助项目(09-02)

摘　　要：文章对朱阳关-夏馆(简称朱-夏)断裂带形成时期的变形温压条件进行一系列研究。首先对石英和长石进行动态重结晶分析,得到朱-夏断裂附近的变形温度为300～650℃,带中心温度较高,为500～650℃。越靠近构造带温度越高,往两侧递减,变形环境在绿片岩相到低角闪岩相之间。通过EBSD实验得到石英组构,岩石石英C轴组构分析结果点极密分布于边缘,可推断其变形温度为400～600℃。电子探针数据指示其变形温度为608.6℃,变质压力的上限为5 161bar,变质程度最高可达角闪岩相。研究结果反映出朱阳关-夏馆断裂带是中温-中低压条件下形成的。A series of studies have been made of the temperature and pressure conditions of tectonic deforma- tion of Zhuyangguan-Xiaguan fault belt in its ductile deformation stage. Firstly, the ddormation temperature near Zhu-Xia fault belt is obtained by the dynamic recrystallization analysis of quartz and feldspar, which is 300-650℃. The center temperature is higher, which is 500-650 ~C, and the temperature of the fault belt de- creases to both sides. The deformation environment is between greenschist facies and amphibolite facies. Sec- ondly, the EBSD test shows the quartz C-axis fabric, and most points of the analysis result of quartz C-axis fabric extremely close locate at the edge, thus it is deduced that the deformation temperature is 400-600 ℃. Finally, the electron microprobe data indicates that the deformation temperature is 608.6 ℃, the upper limit for the metamorphic pressure is 5 161 bar, and the degree of metamorphism is up to amphibo- lites facies. The results demonstrate that Zhuyangguan-Xiaguan fault belt is formed in conditions of medium temperature and low to medium pressure.

关 键 词：秦岭造山带 朱阳关-夏馆断裂带 动态重结晶 石英C轴组构 温压条件 

分 类 号：P542.2[天文地球—构造地质学]