川滇地块东部老鹰山的构造地貌特征及其揭示的地块隆升和旋转运动
P931.2; 印-欧大陆板块的碰撞与挤压造成了青藏高原的隆升和陆内变形,同时引起川滇菱形地块的侧向逃逸与旋转,目前针对川滇菱形地块中部和西部地区的旋转量已进行了大量古地磁研究,但对其东部地区的旋转研究相对缺少.由于河流地貌对地块的旋转量十分敏感,因此,研究利用 30m分辨率的数字高程模型(DEM)提取了川滇菱形地块东部老鹰山地区的 22个流域盆地,通过分析其局部地形起伏比、河流纵剖面、河流陡峭指数以及流域方位角 4个地貌参数来确定老鹰山地区的地块旋转量和隆升量.研究结果显示:老鹰山地区自晚中新世以来,隆升量约为 358 m,隆升趋势为北高南低;河流陡峭指数值整体分布趋势由北向南逐渐降低,高值...
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| Published in | 地质力学学报 Vol. 30; no. 4; pp. 535 - 546 |
|---|---|
| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
昆明理工大学国土资源工程学院,云南昆明 650093
01.08.2024
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1006-6616 |
| DOI | 10.12090/j.issn.1006-6616.2023087 |
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| Abstract | P931.2; 印-欧大陆板块的碰撞与挤压造成了青藏高原的隆升和陆内变形,同时引起川滇菱形地块的侧向逃逸与旋转,目前针对川滇菱形地块中部和西部地区的旋转量已进行了大量古地磁研究,但对其东部地区的旋转研究相对缺少.由于河流地貌对地块的旋转量十分敏感,因此,研究利用 30m分辨率的数字高程模型(DEM)提取了川滇菱形地块东部老鹰山地区的 22个流域盆地,通过分析其局部地形起伏比、河流纵剖面、河流陡峭指数以及流域方位角 4个地貌参数来确定老鹰山地区的地块旋转量和隆升量.研究结果显示:老鹰山地区自晚中新世以来,隆升量约为 358 m,隆升趋势为北高南低;河流陡峭指数值整体分布趋势由北向南逐渐降低,高值区主要分布在老鹰山地区北部,低值区主要分布在研究区老鹰山顶部以及老鹰山地区南部;同时根据流域方位角结果表明老鹰山地区旋转量为逆时针旋转 15°左右.研究表明自晚中新世以来,川滇地块内元谋断裂以西受走滑断裂影响较小,主要为顺时针旋转;元谋断裂以东受走滑断裂等强烈的左行走滑影响,发生了逆时针旋转并伴随着差异隆升. |
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| AbstractList | P931.2; 印-欧大陆板块的碰撞与挤压造成了青藏高原的隆升和陆内变形,同时引起川滇菱形地块的侧向逃逸与旋转,目前针对川滇菱形地块中部和西部地区的旋转量已进行了大量古地磁研究,但对其东部地区的旋转研究相对缺少.由于河流地貌对地块的旋转量十分敏感,因此,研究利用 30m分辨率的数字高程模型(DEM)提取了川滇菱形地块东部老鹰山地区的 22个流域盆地,通过分析其局部地形起伏比、河流纵剖面、河流陡峭指数以及流域方位角 4个地貌参数来确定老鹰山地区的地块旋转量和隆升量.研究结果显示:老鹰山地区自晚中新世以来,隆升量约为 358 m,隆升趋势为北高南低;河流陡峭指数值整体分布趋势由北向南逐渐降低,高值区主要分布在老鹰山地区北部,低值区主要分布在研究区老鹰山顶部以及老鹰山地区南部;同时根据流域方位角结果表明老鹰山地区旋转量为逆时针旋转 15°左右.研究表明自晚中新世以来,川滇地块内元谋断裂以西受走滑断裂影响较小,主要为顺时针旋转;元谋断裂以东受走滑断裂等强烈的左行走滑影响,发生了逆时针旋转并伴随着差异隆升. |
| Abstract_FL | [Objective]Since the collision and compression of the Indo-European continental plates,the Qinghai-Tibetan Plateau has experienced uplift and intra-land deformationSince the collision and compression of the Indo-European continental plates,the Qinghai-Tibetan Plateau has experienced uplift and intra-land deformation.Similarly,the Sichuan-Yunnan block underwent lateral escape and rotationSince the collision and compression of the Indo-European continental plates,the Qinghai-Tibetan Plateau has experienced uplift and intra-land deformation.Similarly,the Sichuan-Yunnan block underwent lateral escape and rotation.Although extensive paleomagnetic studies have been conducted on the rotation of the central and western parts of the Sichuan-Yunnan rhombic block,less attention has been paid to the rotation of its eastern partSince the collision and compression of the Indo-European continental plates,the Qinghai-Tibetan Plateau has experienced uplift and intra-land deformation.Similarly,the Sichuan-Yunnan block underwent lateral escape and rotation.Although extensive paleomagnetic studies have been conducted on the rotation of the central and western parts of the Sichuan-Yunnan rhombic block,less attention has been paid to the rotation of its eastern part.This study employs fluvial geomorphology,which is highly sensitive to mass rotation,to investigate the rotation and uplift in the Laoyingshan region,situated in the eastern part of the Sichuan-Yunnan block.[Methods]A 30 m resolution digital elevation model(DEM)was used to identify and analyze 22 basins in the study area.Four geomorphological parameters were examined:local topographic relief ratio,longitudinal profile,normalized steepness index,and basin azimuth.[Results](1)According to regional topographic relief,the low-relief area in the Laoyingshan region is mainly located near the Sijia River and the Baizai River on the western side,whereas the high-relief area is mainly found near the Dabai River and the Gongshan River on the eastern side of the Laoyingshan.The relief around the Dabai and Gongshan Rivers was greater than that around the Sijia River on the western side of Laoyingshan.(2)The normalized steepness index in the Laoyingshan area gradually decreased from north to south.The high-value areas are primarily located near Awang and Jinyuan,corresponding to the east and west branches of the Xiaojiang Fault.In contrast,the low-value areas were mainly distributed at the top of the Laoyingshan and south of the Baozai River in the study area.(3)The results of the river longitudinal profile indicated that the average surface uplift of the area was approximately 358 m.(4)Based on the results of the watershed azimuth angle,the Laoyingshan area underwent a counterclockwise rotation of approximately 15°.[Conclusion]The analysis suggests that since the Late Miocene,the western region of the Sichuan-Yunnan block,located west of the Yuanmou Fault,has experienced fewer effects from strike-slip faults and has predominantly undergone clockwise rotation.Conversely,the eastern region of the Sichuan-Yunnan block,influenced by strike-slip faults,underwent counterclockwise rotation with differential uplift.[Significance]The fluvial geomorphological index outlines the tectonic rotation of the eastern Sichuan-Yunnan block. |
| Author | 谢志鹏 徐琴如 李江涛 董有浦 任洋洋 曹登驰 苏小龙 |
| AuthorAffiliation | 昆明理工大学国土资源工程学院,云南昆明 650093 |
| AuthorAffiliation_xml | – name: 昆明理工大学国土资源工程学院,云南昆明 650093 |
| Author_FL | REN Yangyang DONG Youpu LI Jiangtao XIE Zhipeng CAO Dengchi SU Xiaolong XU Qinru |
| Author_FL_xml | – sequence: 1 fullname: XU Qinru – sequence: 2 fullname: DONG Youpu – sequence: 3 fullname: XIE Zhipeng – sequence: 4 fullname: REN Yangyang – sequence: 5 fullname: LI Jiangtao – sequence: 6 fullname: CAO Dengchi – sequence: 7 fullname: SU Xiaolong |
| Author_xml | – sequence: 1 fullname: 徐琴如 – sequence: 2 fullname: 董有浦 – sequence: 3 fullname: 谢志鹏 – sequence: 4 fullname: 任洋洋 – sequence: 5 fullname: 李江涛 – sequence: 6 fullname: 曹登驰 – sequence: 7 fullname: 苏小龙 |
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| DocumentTitle_FL | Tectonic and geomorphological characteristics of Laoyingshan in the eastern Sichuan-Yunnan block:Insights into the uplift and rotation of the blocks |
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| Keywords | 地块隆升 uplift Xiaojiang fault tectonic geomorphology 小江断裂 构造地貌学 eastern Sichuan-Yunnan block 地块旋转 川滇地块东部 block rotation |
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| Title | 川滇地块东部老鹰山的构造地貌特征及其揭示的地块隆升和旋转运动 |
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