| 秦岭地区城口—房县断裂带变形特征及ESR定年 |
| |
| 引用本文： | 徐亚军,杨坤光,马昌前.秦岭地区城口—房县断裂带变形特征及ESR定年[J].现代地质,2005,19(1):127-132. |
| |
| 作者姓名： | 徐亚军 杨坤光 马昌前 |
| |
| 作者单位： | 中国地质大学,地球科学学院,湖北,武汉,430074 |
| |
| 基金项目： | 国家重点自然科学基金(40334037). |
| |
| 摘 要： | 秦岭城口—房县断裂带是秦岭造山带和扬子板块的分界断裂带, 平面上呈向南西突出的弧形, 构成大巴山弧。断裂带的宏观构造组合显示了断裂带由北向南强烈逆冲, 断层岩的宏观特征和显微构造特征表明断裂带以浅层脆性变形为特点, 对断层岩的有限应变测量得出岩石发生了中等到较弱的变形。由断裂带石英脉电子自旋共振 (ESR)定年,测得 11个石英脉的年龄集中在 3个年龄段(240~230Ma, 165~130Ma, 70~60Ma), 其中 7个样品的年龄集中在 165~130Ma之间, 由此推断断裂带活动于中晚侏罗世(165~130Ma)达到其构造变形最强烈时期。
|
| 关 键 词： | 城口—房县断裂带 变形特征 ESR定年 |
| 文章编号： | 1000-8527(2004)04-0127-06 |
| 修稿时间： | 2004年7月14日 |
Deformation Characteristics and the ESR Dating of Chengkou-Fangxian Fault Zone in the Qinling area |
| |
| XU Ya-jun,YANG Kun-guang,MA Chang-qian.Deformation Characteristics and the ESR Dating of Chengkou-Fangxian Fault Zone in the Qinling area[J].Geoscience——Journal of Graduate School,China University of Geosciences,2005,19(1):127-132. |
| |
| Authors: | XU Ya-jun YANG Kun-guang MA Chang-qian |
| |
| Abstract: | The Chengkou-Fangxian fault zone is on the boundary of the Qinling Orogen and Yangtze Plate. The fault zone shows an arc-structure extruding towards SW, which composed the Dabashan tectonic arc. The macrostructures show that this fault zone thrusts strongly from north to south. The macrostructures and microstructures of these fault rocks reveal that the deformation mechanism of this fault zone is characterized by its brittle shallow. The finite strain measurements show that these rocks suffered a low-middle intensity deformation. Eleven quartz veins in the fault zone are dated by the Electron Spin Resonance(ESR),and their ages are distributed in the three stages (240-230 Ma,165-130 Ma,70- 60 Ma).Seven of them have ages from 165Ma to 130 Ma, indicating that the climax activity of this fault zone takes place at the Middle to Late Jurassic(165-130Ma). |
| |
| Keywords: | Chengkou-Fangxian fault zone the deformation characteristic ESR dating |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
