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A comparative geomorphological study based upon the environmental dating method of erosional forms on Karst region in Japan.

基于日本喀斯特地区侵蚀形态环境测年方法的比较地貌研究。

基本信息

批准号：
62450086
负责人：
MIURA Hajime
金额：
$ 1.6万
依托单位：
YAMAGUCHI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

项目摘要

The purpose of this research is to make clear regional differences of karstic erosional forms on the temperate region and the subtropical region.1. On the Akiyoshidai and Hiraodai limestone plateaus, as an example for the temperatic karst region, they are characteristic of Doline karst. However, in the Ryukyu islands, as an example for the subtropical karst region, there are found downed doline lands, cone karst areas and karstic dry valleys. These karst land forms are very important in Japan.2. On our comparative geomorphological study of Karrenfeld, almost all types of karren classified already by A.Bobli, M.M.Sweeting, J.N.Jennings, D.Ford and P.Williams are found on the Akiyoshidai karstland and the Ryukyu islands. Sometimes meander karren and Iimestone pavement develop upon limestone outcrops in the Hiraodai plateau, but they are absence on the Ryukyu karst areas.3. Karst landforms have presented many good examples for climatic geomorphology Analysis of carbonate speleothems offers an interesting field for climatic geo morphology in limestone regions. The speleothem consists of numerous layers-, this is called Growth rings. Many speleothem rings have been analyzed by ESR Dating and LLMZA. The formation of growth rings and the volume ( or thickness ) of each layer of growth rings are indicative of an influence of Late Quaternary climatic changes. Similarly, the relationship between the growth rates of each layer in each period show the relative denudation rate of karst terrain.The results of this study show a new approach to the investigation into the relationships between the evolution or karst landforms and the climatic changes during Quaternary period. This new approach seems to be useful method of revealing the Quaternary climatic changes in limestone areas worldwide.

本研究的目的是明确温带和亚热带岩溶侵蚀形态的区域差异。在Akiyoshidai和Hiraodai石灰岩高原上，作为温带岩溶区的例子，它们具有多林岩溶的特征。然而，在琉球群岛，作为亚热带岩溶区的例子，发现了塌陷的漏斗地、锥形岩溶区和岩溶干燥山谷。这些喀斯特地貌在日本非常重要。在我们对卡伦菲尔德的比较地貌研究中，几乎所有已被A.Bobli、M.Sweting、J.N.Jennings、D.Ford和P.Williams分类的卡伦类型都出现在秋吉岛和琉球群岛上。平代高原石灰岩露头上有时发育曲流卡伦和石灰石路面，琉球喀斯特地区则没有。喀斯特地貌为气候地貌提供了许多良好的范例。碳酸盐洞穴分析为研究石灰岩地区的气候地貌提供了一个有趣的领域。洞穴群由许多层组成，这被称为生长轮。用ESR测年和LLMZA分析了许多喷发水环。生长轮的形成和每一层生长轮的体积(或厚度)反映了晚第四纪气候变化的影响。同样，每一时期各层生长速率之间的关系也反映了喀斯特地形的相对剥蚀速率。这一研究结果为研究第四纪喀斯特地貌演化与气候变化的关系提供了一种新的途径。这一新方法似乎是揭示全球石灰岩地区第四纪气候变化的有用方法。