| 雪峰山安化--溆浦断裂带变形特征及ESR定年 |
| |
| 引用本文： | 杨奎锋,杨坤光,马昌前.雪峰山安化--溆浦断裂带变形特征及ESR定年[J].大地构造与成矿学,2004,28(3):263-269. |
| |
| 作者姓名： | 杨奎锋 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;中国地质大学地球科学学院,湖北,武汉,430074;中国地质大学地球科学学院,湖北,武汉,430074 |
| |
| 基金项目： | 国家自然科学基金，中国石油化工集团公司资助项目，40334037，，， |
| |
| 摘 要： | 安化—溆浦断裂是雪峰山西部一条重要的区域性断裂带。宏观上呈向NW突出的弧形 ,由数条从溆浦向南撒开的主断裂及其次级分支断层组成。显微构造、断层岩与石英脉流体包裹体均一温度 (集中在 16 0℃附近 )均显示 ,断裂带以浅层脆性变形为主 ,最深动力变质岩仅为糜棱岩化绢云母千枚岩。断层岩中石英脉ESR(电子自旋共振 )定年显示 ,断裂在燕山期 (15 6 .9～ 136 .2Ma ,119.8～ 90 .6Ma)热流体活动强烈 ;而发育在上述两个时间段内的石英脉 ,不论在野外产状、显微构造及流体包裹体均一温度上都存在明显的差异 ,由此初步推断 ,这两个时间段之间应是雪峰山中生代挤压与伸展运动的反转时期。
|
| 关 键 词： | 雪峰山 安化-溆浦断裂带 ESR(电子自旋共振) 流体包裹体 |
| 文章编号： | 1001-1552(2004)03-0263-07 |
| 修稿时间： | 2004年1月5日 |
DEFORMATION CHARACTERISTICS AND ESR DATING OF ANHUA-XUPU FAULT BELT IN THE XUEFENG MOUNATAINS, HUNAN |
| |
| YANG Kuifeng,YANG Kunguang and Ma Changqian.DEFORMATION CHARACTERISTICS AND ESR DATING OF ANHUA-XUPU FAULT BELT IN THE XUEFENG MOUNATAINS, HUNAN[J].Geotectonica et Metallogenia,2004,28(3):263-269. |
| |
| Authors: | YANG Kuifeng YANG Kunguang and Ma Changqian |
| |
| Abstract: | Anhua-Xupu fault belt plays a very important role in the formation of the western Xuefeng Mountains. The fault belt shows an arc-structure extruding towards NW, and is comprised of several main faults with accessory faults expanding toward south from the Xupu region. Fault rocks, microstructures and homogeneous temperature (concentrated around 160 ℃) of fluid inclusions in the quartz veins prove that the fault belt mainly underwent shallow brittle deformation and the highest-grade dynamic metamorphic rock is mylonitized sericite phyllite. The ESR (Electron Spin Resonance) dating from the quartz veins in the fault rocks shows that the fault belt underwent an intense fluid movement stage at Yanshanian (156.9～136.2 Ma,119.8～90.6 Ma); Moreover, not only the attitude and microstructures but also the homogeneous temperature of the quartz veins developed in that two stages show obvious diversity, which proves that there exists the reversion period of Mesozoic extension and compression movement of the Xuefeng Mountains between these two stages. |
| |
| Keywords: | the Xuefeng Mountains Anhua-Xupu fault belt ESR (Electron Spin Resonance) fluid inclusions |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
