【作者】 钟雷；

【导师】 张威；

【作者基本信息】 辽宁师范大学 ， 自然地理， 2010， 硕士

【摘要】 青藏高原东缘山地包括高原东北、东部和东南部地区,北起贺兰山,南至点苍山的广大地区。在气候上,受西南季风、东南季风、西风环流以及高原季风的共同作用,是联系青藏高原和东部太平洋沿岸山地的关键部位。在构造上,又是高大青藏高原的边缘、中国第二、三阶梯的过渡地带,破碎带十分发育,地质灾害普遍。由于特殊的地理位置,本区的第四纪冰川作用研究一直以来都被众多第四纪冰川学者所关注,为国内外研究的重点地区之一,在冰川发育、青藏高原隆升和季风的演化等问题上均具有重大的科学意义。本论文以贺兰山为研究背景,以冰川发育的气候与构造运动耦合关系为主线,通过对贺兰山野外地质地貌考察,运用多种测定年与环境演变的手段,并结合高原东缘多座山地冰川发育情况,综合分析晚更新世构造运动和气候条件对冰川发育的共同影响。采取野外地貌考察、样品采集,室内样品处理分析,年代断定,样品粒度分析,对研究区的冰川发育地貌特点,冰川作用序列,雪线高度进行深入分析。结合前人研究资料,高原隆升对东缘山地的抬升作用,深入分析了构造抬升与冰川发育的耦合关系。青藏高原东缘地区受高原晚更新世以来抬升作用影响,高原内部及周围地区自15ka.B.P.以来抬升明显,普遍抬升量超过百米,甚至个别地区达到千余米之多。导致高原周围地区(本文以高原东缘地区为例)在晚更新世晚期山体高度普遍超过当时雪线高度,进而发育了末次冰期冰川作用,通过野外考察和前人资料所得,高原东缘地区大量山体存在末次冰期冰川作用遗迹,而无早期冰川作用遗迹。明显说明了研究区山体末次冰期冰川发育除受末次冰期气候变冷影响外,构造运动同样是促使冰川发育的重要因素,即高原东缘山体末次冰期冰川作用受环境和构造共同影响,二者缺一不可。更多还原

【Abstract】 East Qinghai-Tibet Plain area mountainous region including plateau Northeast, eastern part and southeast area, north Helan Mountain, winter solstice Diancang’s general areas. In the climate, the southwest monsoon, southeast the monsoon, the westerly wind circulation as well as the plateau monsoon’s combined action, is relates the Qinghai-Tibet Plain and the eastern Pacific rim mountainous region essential spot. Structurally, is also the big Qinghai-Tibet Plain edge, the Chinese second, third steps and ladders zone of transition, the crushed zone grows, the geological disaster is common. As a result of the special geographical position, the home court Quaternary Period glacial action research is taken by the numerous scholars, to become the domestic and foreign research the key area. To the glacier growth, the Qinghai-Tibet Plain rises with monsoon questions and so on evolution to have the significant scientific significance prosperously. The present paper take Helan Mountain as the research background, take the glacier growth and tectonic movement’s relations as the master line, through to the Helan Mountain open country geology landform inspection, the method which the utilization many kinds of determination years and the environment evolve, and unifies east the plateau the reason many mountainous region glacier growth situation, generalized analysis epipleistocene tectonic movement to glacier growth influence.Adopts the open country landform inspection, sampling gathering, the indoor sample processing analysis, the age concluded that the sample sizing test, to studies the area the glacier growth landform characteristic, the glacial action sequence, the snow line carries on the thorough analysis highly. Unifies the predecessor to study the material, the plateau rises prosperously to the east reason mountainous region lifting function, has analyzed the structure lifting and the glacier growth coupling relations thoroughly.East since the Qinghai-Tibet Plain the reason area is jacked the plateau epipleistocene the function influence, the plateau interior and periphery the area jacks obviously since 15ka. B.P., jacks the quantity to surpass hundred meters generally, even the individual area achieves thousand meter many. Caused around the plateau the area (this article take plateau east reason area as example) to surpass at that time the snow line altitude highly generally in the epipleistocene later period mountain massif, then has grown end the inferior drift epoch glacial action, through field work and predecessor material obtained, east plateau reason area massive mountain massif existence end inferior drift epoch glacial action vestige, but non-early time glacial action vestige. Explained obviously the research area mountain massif end inferior drift epoch glacier growth place changes outside the cold influence end the inferior drift epoch environment, the tectonic movement is similarly urges the glacier growth the important attribute, namely east the plateau the reason mountain massif end inferior drift epoch glacial action the environment and the structure joint influences, the two is indispensable.更多还原