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| 鄂尔多斯及其邻近块体相对运动的黄土古地磁证据 | |
| 引用本文： | 李万伦,卢演俦,丁国瑜.鄂尔多斯及其邻近块体相对运动的黄土古地磁证据[J].第四纪研究,2001,21(6):560-565. |
| 作者姓名： | 李万伦 卢演俦 丁国瑜 |
| 作者单位： | 1. 中国地震局地质研究所,北京,100029 2. 中国地震局分析预报中心,北京,100036 |
| 基金项目： | 国家自然科学基金项目 (批准号 :4 9732 0 90和 4 9872 0 6 2 )资助 |
| 摘 要： | 借助景观地理学与景观生态学原理,结合前人研究成果和野外实地考察,利用地理信息系统与遥感技术,论述了玛纳斯湖群景观第四纪以来的迁移演化过程,分析了玛纳斯湖景观动态变化的自然和人为原因,评价了玛纳斯湖景观变化产生的生态环境效应,从水资源合理利用角度提出了保护绿洲和荒漠生态环境的建设性措施. |
| 关 键 词： | 黄土 虚磁极法 鄂尔多斯块体 相对转动量 |
| 收稿时间： | 2001-08-25 |
| 修稿时间： | 2001年8月25日 |
PALEOMAGNETIC EVIDENCE FROM LOESS FOR THE RELATIVE MOTION BETWEEN THE ORDOS AND ITS ADJACENT BLOCKS |
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| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029; 2. Laboratoire de Palynologie-URA 327, University Montpellier II, France |
| Abstract: | Loess recorded stable detrimental remanent magnetization (DRM). It is possible to reveal the relative motion between the Ordos and its adjacent blocks by using the VGP (virtual geomagnetic pole) method in loess. Our preliminary results indicate that the Ordos block had rotated counterclockwise during the Quaternary period. Since 0.46MaB.P., its rotation relative to the Taihangshan block has been about 8.2°±5.8° and its rotation relative to the Xining block about 10.5°±6.4°. Its rotation relative to the Xining block has been about 29.8°±14.7° since 1 17MaB.P. and about 31.5°±11.4° relative to the Qinling block since 2.5MaB.P. From these results, the following estimates can be obtained: (1) there has been about 31.7km dextral slip along the western edge of the Ordos block (Liupanshan fault zone) since 1.17MaB.P.; (2) about 27.5km sinistral slip along the Weihe fault-bounded zone since the early Pleistocene (ca. 2.5MaB.P.); and (3) about 10.7km dextral slip along the Shanxi fault-bounded zone since 0.46MaB.P. |
| Keywords: | loess VGP method Ordos block relative rotation |
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