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| 贡嘎山第四纪冰川遗迹及冰期划分 | |
| 引用本文： | 苏珍,施雅风,郑本兴.贡嘎山第四纪冰川遗迹及冰期划分[J].地球科学进展,2002,17(5):639-647. |
| 作者姓名： | 苏珍 施雅风 郑本兴 |
| 作者单位： | 中国科学院寒区旱区环境与工程研究所,甘肃,兰州,730000 |
| 基金项目： | 国家重点基础研究发展规划项目“青藏高原形成演化及其环境资源效应”(编号 :G19980 40 8)，中国科学院知识创新工程重要方向项目“中国西部冰冻圈动态变化及其资源环境效应研究(编号 :KZCX2 3 0 1)，中国科学院寒区旱区环境与工程研究所知识创新项目“小冰期以来气候与 |
| 摘 要： | 在对贡嘎山现代冰川和古冰川考察研究的基础上，结合定位观测分析，对该区第四纪冰川遗迹进行了深入讨论，划分出三次冰期，即中更新世早期的倒数第三次冰期，中更新世晚期的倒数第二次冰期和晚更新世的末次冰期，以及全新世的新冰期和小冰期。提出在早更新世时，由于山体未达到当时冰川发育的雪线高度，所以未发育冰川；中更新世早期的冰期冰川为半覆盖式冰川类型，规模不大；中更新世晚期的冰期冰川是本区最大冰川作用时期，形成网状山麓冰川，东坡冰川曾达磨西台地；晚更新世冰期冰川以山谷冰川为主，以后规模逐次缩小。 |
| 关 键 词： | 第四纪冰川 冰川遗迹 冰期划分 贡嘎山 |
| 文章编号： | 1001-8166(2002)05-0639-09 |
| 收稿时间： | 2001-03-18 |
| 修稿时间： | 2002-06-14 |
QUATE RNARY GLACIAL REMAINS ON THE GONGGA MOUNTAIN AND THE DIVISION OF GLACIAL PERIOD |
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| SU Zhen,SHI Ya feng,ZHENG Ben xing.QUATE RNARY GLACIAL REMAINS ON THE GONGGA MOUNTAIN AND THE DIVISION OF GLACIAL PERIOD[J].Advance in Earth Sciences,2002,17(5):639-647. | |
| Authors: | SU Zhen SHI Ya feng ZHENG Ben xing |
| Institution: | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,China |
| Abstract: | The huge and magnificent Gongga mountain, located at the east margin of the Qinghai-Xizang (Tibet) Plateau, is an important glaciation center of monsoonal maritime type in the Hengduan mountains. Here contemporary glaciers are well developed and Quaternary glacial remains are common. Over a long period of time, many scholars from abroad and at home have investigated the glaciers and the environment conditions of the region and published quite a few research results. However, there are still different views on the research of Quaternary glaciers and the division of glacial period. Remains of Quaternary glaciers are widespread in the Gongga mountain region, glacial accumulation and erosion landforms are coexistent, especially glacial accumulation landforms were well preserved, which reflects that the region has been glaciated many times. Based on the findings in the investigation of the Gongga mountain, such as remains of Quaternary glaciers, stratigraphic contact relation, landform position, till fabric, weathering degree, as well as comparison of adjacent age-known strata and a few of dating data, the authors divided the Quaternary glaciers in the region into three ice ages, namely early antepenultime glacial period of mid-Pleistocene, late penultimate glacial period of mid-Pleistocene and last glacial period of late Pleistocene, as well as neoglacial period and little Ice Age of Holocene. During the early Pleistocene no glacier was developed in the Gongga mountain because large part of its massif did not reach the altitude of snow line or the cryospheric altitude. Glacial tills of the early antepenultimate of mid-Pleistocene mostly occur at valley head or a higher position, they perhaps belong to semi-covered-type glaciers of small size; the late penultimate glacial period of mid-Pleistocene was the maximum reach of the glaciation in the Gongga mountain region, when the braided piedmont glaciers were formed, the Yanzigou Glacier on the eastern slope joined the Mozigou Glacier and the elevation of the main polished platform of the glacial tongue reached 1 500 m above sea level. During the last glacial period of last Pleistocene the glacier size was smaller than that of the penultimate glacial period but larger than that of the neoglacial period and the little Ice Age. They can be divided into two stages and the glacier size of the late stage was larger than that of the early stage. During the neoglacial period of Holocene glaciers experienced three rapid advances but their scales were smaller than those of last glacial period. During little Ice Age between 15~19th century glaciers obviously and fluctuatedly advanced three times and their scales were slightly larger than those of modern glaciers. |
| Keywords: | Quaternary glaciers Division of Glacial period Gongga mountain |
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