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| 青藏高原东南缘玉龙雪山（5596m）晚新生代隆升的侵蚀与构造控制作用 | |
| 引用本文： | 石许华,王二七,王刚,樊春.青藏高原东南缘玉龙雪山（5596m）晚新生代隆升的侵蚀与构造控制作用[J].第四纪研究,2008,28(2):222-231. |
| 作者姓名： | 石许华 王二七 王刚 樊春 |
| 作者单位： | 1. 中国科学院青藏高原研究所,北京,100085;中国科学院研究生院,北京,100049 2. 中国科学院地质与地球物理研究所,北京,100029;中国科学院青藏高原研究所,北京,100085 3. 中国科学院地质与地球物理研究所,北京,100029 |
| 基金项目： | 国家重点基础研究发展规划项目(批准号:2002CB412601)，国家自然科学基金项目(批准号:40672151)资助 |
| 摘 要： | 玉龙雪山位于青藏高原东南缘,它以其独特的地貌特征而引人关注。其顶部为一古残留面,在30×20km2范围内海拔>5000m的山峰达18座,高出其周围地区平均海拔近1000m。在分析该区地质地貌特征基础上,我们根据岩石圈弹性挠曲地壳均衡理论,以较保守的残留面海拔4250m为当时金沙江下切玉龙雪山的基准面,结果表明:由于虎跳峡中大规模物质剥蚀而引起玉龙雪山地壳均衡反弹,导致山体隆升了468m,这完全是侵蚀作用对于玉龙雪山隆升的贡献。而玉龙雪山与周围地区的剩余地势高差,主要由正断层等构造作用造成。因此,玉龙雪山的隆升是侵蚀与构造作用共同控制的结果。该区最大量地壳均衡反弹的触发机制是5.02.5M a期间玉龙雪山东西两侧正断层的发生。另一方面,作为玉龙雪山的南东延伸部分——点苍山（4122m）在5.02.5M a同样也发生了构造伸展,但是没有遭受大规模的河流侵蚀作用,因此其海拔相对要低很多。这进一步说明地壳均衡反弹导致了玉龙雪山隆升,并加大了玉龙雪山与点苍山在原有基础上的地势高差。 |
| 关 键 词： | 青藏高原东南缘 玉龙雪山 虎跳峡 地壳均衡反弹 侵蚀 隆升 |
| 文章编号： | 1001-7410(2008)02-222-10 |
| 收稿时间： | 2007-06-05 |
| 修稿时间： | 2007年6月5日 |
LATE CENOZOIC UPLIFT OF THE YULONG SNOW MOUNTAIN(5596m), SE TIBETAN PLATEAU,CAUSED BY EROSION AND TECTONIC FORCING |
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| Shi Xuhua,Erchie,Wang Gang,Fan Chun.LATE CENOZOIC UPLIFT OF THE YULONG SNOW MOUNTAIN(5596m), SE TIBETAN PLATEAU,CAUSED BY EROSION AND TECTONIC FORCING[J].Quaternary Sciences,2008,28(2):222-231. | |
| Authors: | Shi Xuhua Erchie Wang Gang Fan Chun |
| Institution: | 1. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049; 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 |
| Abstract: | The Yulong Snow Mountain,located at the southeastern margin of the Tibetan Plateau,has attracted researchers' attention by its unique geomorphic features.Within an area of 30×20km2 on the top of the mountain,considered a relict surface,there are 18 peaks in excess of 5000m in elevation.According to geologic and geomorphologic characteristics of this area and the elevation of the relict surface（4250m）referenced as the initial incision surface,the analyses by isostasy of the lithospheric elastic flexural model indicate that the erosion loss in the Hutiaoxia（Tiger Leap Gorge）caused isostatic rebound of the Yulong Snow Mountain and therefore resulted in an uplift of 468m of the mountain,which is solely contributed by erosion.The other topographic relief between the Yulong Snow Mountain and its surrounding area is caused by tectonic forcing,such as the normal faulting bounding the mountain.Therefore,the uplift of the Yulong Snow Mountain since Late Cenozoic is resulted from both erosion and tectonic forcing.The triggering factor for the isostatic rebound of this area is the development of the normal faulting on both the east and west sides of the mountain during 5.0～2.5Ma.On the other hand,the Diancang Shan,4122m of highest elevation and as the part continuing southward from the Yulong Snow Mountain also experienced a tectonic extension at 5.0～2.5Ma,but differing from the Tiger Leap Gorge had little erosion,which further proves the existence of isostatic rebound in the Yulong Snow Mountain and this rebound also increased the modern high relief between the two mountains. |
| Keywords: | Southeastern Tibetan Plateau Yulong Snow Mountain Tiger Leap Gorge isostatic rebound erosion uplift |
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