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FORMATION OF THE HIMALAYAS AND GLOBAL ENVIRONMENTAL CHANGE-COOPERATIVE RESEARCH FOR ESTABLISHMENT OF THE RESEARCH INSTITUTE OF THE HIMALAYAS-

喜马拉雅与全球环境变化的形成——合作研究设立喜马拉雅研究院——

基本信息

批准号：
10045027
负责人：
TAKAYASU Katsumi
金额：
$ 4.48万
依托单位：
SHIMANE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

Focuses and results of this research project are summarized as follows ;1. Time and space distribution of freshwater mollusca with reference to the environmental change caused by the Himalayan upliftThe faunal change of freshwater mollusca during the late Neogene and Quaternary in the Himalayan area was illuminated. As for the remarkable faunal change at 5Ma characterized by the introduction of many species of palaearctic elements to the southern area of the Himalayas, it is the most probable that the migration of water birds became active by the formation of intense monsoon system caused by the Himalayan uplift.2. Geological events in the Siwalik Group concerned with the Himalayan upliftThe method for estimation of the palaeoflow velocity during the sedimentation of the Siwalik Group was established. Based on the method, the palaeoflow velocity of each horizon was shown definitely.3. Water environment in Pokhara BasinThe water quality and the nutrient input in Phewa Lake was investigated. Because of the geological condition, the most of river water sink into the underground before reaching the lake, and it controls the water quality of the lake.4. Geological disaster in the Siwalik hillsThe detail investigation about the landslide along the Chor Khola was carried out. An interesting toppled structure with sliding indicates that steeply dipping strata along the major tectonic line, contrasting rigidity between sandstone and mudstone, and rapid dissection by a river were the major causes of the toppling.

本研究课题的研究重点和成果概括如下： 1．喜马拉雅隆升引起环境变化的淡水软体动物时空分布阐明了喜马拉雅地区新近纪晚期和第四纪淡水软体动物区系的变化。至于5Ma以多种古北元素传入喜马拉雅山南部地区为特征的动物区系显着变化，最有可能是由于喜马拉雅隆升引起的强烈季风系统的形成而使水鸟的迁徙变得活跃。2．与喜马拉雅隆起有关的Siwalik群地质事件建立了Siwalik群沉积过程中古流速的估算方法。以此方法明确地显示了各层位的古流速。 3．博卡拉盆地水环境对费瓦湖的水质和养分输入进行了调查。由于地质条件的影响，河水在到达湖泊之前大部分沉入地下，控制着湖泊的水质。4．西瓦利克山地质灾害对楚科拉河沿岸山体滑坡进行了详细调查。一个有趣的滑动倒塌结构表明，沿主要构造线的陡倾地层、砂岩和泥岩之间的刚性对比以及河流的快速切割是导致倒塌的主要原因。