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Chronological Studies of Mountain Uplift with the Use of Identification and Correlation of the Widespread Tephra Layers.

利用广泛分布的火山灰层的识别和关联进行山脉隆起的年代学研究。

基本信息

批准号：
10480015
负责人：
YAMAZAKI Haruo
金额：
$ 7.23万
依托单位：
Tokyo Metropolitan 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

1. Three types of the uplift history were distinguished from the mountains in the Japanese Islands through the information obtained from the chronological studies of Quaternary sediments in and around the mountain area.2. Two widespread tephra layers, that are useful for clarifying the uplift history of mountains in central Japan, were identified and correlated between central Japan and other Quaternary sedimentary basins.3. The Kannawa fault along the onshore plate boundary zone in central Japan has ceased its activity since 0.2-0.3 Ma. Recent activity is replaced by the young active faults.4. Four tephras in the plio-pleistocene sediments being consisted of the Nishi-kubiki Mountains, southwestem Niigata Prefecture, were identified and correlated with some pyroclastic flows in the Hida Mountains, central Japan. This information suggests that the Nishi-kubiki Mountains commenced their uplift at about 2.7 Ma.5. Tilting rate obtained from the terrace heights along the Kurobe river suggests that the Hida mountains had experienced more intense uplift in the middle Pleistocene than in the present.6. Tephra layers on the Kureha Hills in Toyama have possibility to be identified with the mid-Quaternary pyroclastic flows in the Hida Mountains.7. Detailed analysis of the deep drilling cores from the Nobi sedimentary basin revealed that the Nobi tilting movement started its activity at early Pleistocene and has accelerated sharply since the middle Pleistocene.8. Tephrochronological studies for the plio-pleistocene sediments in southwest Japan revealed that the Kyushu and Shikoku Mountains started their uplift movements at 2-3 Ma. These result from the increasing of E-W compression caused by the oblique subduction of PHS and eastward migration of the Amurian Plate.

1.通过对日本列岛山地及其周边第四纪沉积物年代学研究，将山地隆升历史划分为三种类型.在日本中部地区和其他第四纪沉积盆地之间识别和对比了两个广泛分布的火山灰层，这对阐明日本中部山脉的隆升历史是有用的。日本中部沿陆板块边界带的关轮断层沿着在0.2-0.3 Ma后停止活动。现代活动被年轻的活动断层所取代。在日本新泻县西南部西久备山的上更新世沉积物中发现了4个火山碎屑岩，并与日本中部希达山的火山碎屑流进行了对比。这一信息表明，西久备山开始隆起约2.7 Ma.5。从沿着黑部川的阶地高度获得的倾斜率表明，希达山脉在中更新世经历了比现在更强烈的隆升。富山吴羽山火山碎屑层有可能与希达山中第四纪火山碎屑流相鉴别。对Nobi沉积盆地深钻岩心的详细分析表明，Nobi倾斜运动在早更新世开始活动，自中更新世以来急剧加速。对日本西南部上更新世沉积物的年代学研究表明，九州山和四国山的隆升运动开始于2-3 Ma。这是由于北太平洋板块斜向俯冲和阿穆尔板块东移所引起的东西向挤压作用增强的结果。