Study on Structural Features and P—T Conditions of the Waxuezi——Qiaoduan Fault Zone in Northern Qinling Mountains
详细信息
- 责任者：Tu Wenchuan (School of Resources and Environmental Engineering ; Hefei University of Technology ; Hefei 230009 ;
- 责任者：China) ; Song Chuanzhong
- 刊名：Geological Review
- 出版年：2013
- 卷期：59(4)
- 关键词：断裂带 ; fracture zones ; 构造变形 ; tectonic deformation ; 温压条件 ; P-T conditions ; 秦岭 ; Qinling Mountains
- 页码：p.760-768
- 图表：illus., 3 tables, 24 refs.
- 分类号：0300
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
摘要
The Waxuezi—Qiaoduan fault zone is one of the most important fault zones in North Qinling Mountains, it had a long history of metamorphism and deformation, and recorded the information of the subduction and demise of the Erlangping arc basin northward to the south edge of the North China plate. This paper used several methods to do a study on geometry,kinematics,and the formation P—T conditions of the Waxuezi—Qiaoduan fault zone,and obtained the following understandings: ① the trend of the Waxuezi—Qiaoduan fault zone is NNE. Lineations developed in the fault zone indicate the kinematics characteristics of thrusting from north to south,and contained sinistral shearing component; ② the deformed rocks in fault zone had abvious characteristics of microstructures,which reflect the plastic flow under compressive stress. ③ Al-in-hornblende barometer is employed in this paper to analyze the formation pressure of the Waxuezi—Qiaoduan fault zone,and the result is about 0.64 GPa.The pressure becomes larger while closer to the fault zone center.The maximum pressure which comes from the center of the fault zone is 0.68GPa,and indicates the environment of medium-pressure phase; ④ We used hornblende—plagioclase T—P meter to limit the formation temperature of the Waxuezi—Qiaoduan fault zone,and got the range of 500~550℃, which shows a medium temperature environment.
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