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| 川滇菱形块体顺时针转动的构造学与古地磁学证据 | |
| 引用本文： | 徐锡伟,程国良,于贵华,宋方敏,向宏发,张兰凤,Hagai Ron,王洋龙,闻学泽. 川滇菱形块体顺时针转动的构造学与古地磁学证据[J]. 地震地质, 2003, 25(1): 61-70. DOI: ISSN:0253-4967.0.2003-01-006 |
| 作者姓名： | 徐锡伟 程国良 于贵华 宋方敏 向宏发 张兰凤 Hagai Ron 王洋龙 闻学泽 |
| 作者单位： | 1. 中国地震局地质研究所,北京,100029 2. 以色列地球物理研究所,P.O.Box,182 3. 云南省地震局,昆明,650204 4. 四川省地震局,成都,610041 |
| 基金项目： | 国家重点基础研究发展规划项目 (G19980 4 0 70 1)资助。 |
| 摘 要： | 川滇菱形块体内部受NE向丽江 -小金河断裂的切割 ,可进一步划分为川西北次级块体和滇中次级块体等南北 2个部分 ;各次级块体东边界断裂有规律地左旋滑动、西边界断裂的右旋滑动及其滑动速率值的差异 ,反映出新生代时期各次级块体作向SE的水平滑移叠加绕垂直轴顺时针转动的复合运动。其中 ,川西北次级块体SE向的水平滑移速率 5mm/a ,顺时针转动角速度 1 4°/Ma ;滇中次级块体SE向的水平滑移速率 3 5mm/a ,顺时针转动角速度约 1 5°/Ma。在滇中次级块体内部姚安、大姚、永仁、昆明北马街等地采集到约 90个古新世地层的定向样品 ,通过交变退磁和热退磁获得了它们各自的剩磁矢量 (实验磁偏角和磁倾角 ) ,由实测磁偏角与期望磁偏角相比可知川滇地区滇中次级块体中新世早期以来的顺时针转动累积量可达 30°～ 4 8°。次级块体的整体转动与块边活动断裂的左旋滑动符合左旋走滑断裂作用区块体作顺时针转动的运动学模式 |
| 关 键 词： | 活动断裂 活动块体 块体转动 磁偏角期望值 磁偏角实测值 川滇地区 |
| 文章编号： | 0253-4967(2003)01-0061-10 |
| 修稿时间： | 2001-08-14 |
TECTONIC AND PALEOMAGNETIC EVIDENCE FOR THE CLOCKWISE ROTATION OF THE SICHUAN- YUNNAN RHOMBIC BLOCK |
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| XU Xi-wei ) CHENG Guo-liang ) YU Gui-hua ) SONG Fang-min ) XIANG Hong-fa ) ZHANG Lan-feng ) Hagai Ron ) WANG Yang-long ) WEN Xue-ze ) ) Institute of Geology,China Seismological Bureau,Beijing ,China ) Institute of Geophysics,Israel,P.O. Box ) Seismological Bureau of Yunnan Province,Kunming ,China ) Seismological Bureau of Sichuan Province,Chengdu ,China. TECTONIC AND PALEOMAGNETIC EVIDENCE FOR THE CLOCKWISE ROTATION OF THE SICHUAN- YUNNAN RHOMBIC BLOCK[J]. Seismology and Geology, 2003, 25(1): 61-70. DOI: ISSN:0253-4967.0.2003-01-006 | |
| Authors: | XU Xi-wei ) CHENG Guo-liang ) YU Gui-hua ) SONG Fang-min ) XIANG Hong-fa ) ZHANG Lan-feng ) Hagai Ron ) WANG Yang-long ) WEN Xue-ze ) ) Institute of Geology China Seismological Bureau Beijing China ) Institute of Geophysics Israel P.O. Box ) Seismological Bureau of Yunnan Province Kunming China ) Seismological Bureau of Sichuan Province Chengdu China |
| Affiliation: | XU Xi-wei 1) CHENG Guo-liang 1) YU Gui-hua 1) SONG Fang-min 1) XIANG Hong-fa 1) ZHANG Lan-feng 1) Hagai Ron 2) WANG Yang-long 3) WEN Xue-ze 4) 1) Institute of Geology,China Seismological Bureau,Beijing 100029,China 2) Institute of Geophysics,Israel,P.O. Box 182 3) Seismological Bureau of Yunnan Province,Kunming 650204,China 4) Seismological Bureau of Sichuan Province,Chengdu 610041,China |
| Abstract: | The inner part of the Sichuan-Yunnan rhombic block is dissected by the Lijiang-Xiaojinhe Fault, and hence can be subdivided into Northwest Sichuan sub-block in the north and Central Yunnan sub-block in the south. The eastern boundary faults of these two sub-blocks are regularly characterized by left-lateral strike-slip, while the western boundary faults are characterized by right-lateral strike-slip. The slip rate of both the eastern and western boundary faults are significantly different. All these phenome |
| Keywords: | active fault active block block rotation expected magnetic declination measured magnetic declination Sichuan-Yunnan region |
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