Plio-Pleistocene Fold Development in the Kashiwazaki Plain and Vicinity, Niigata Prefecture
Plio-Pleistocene Fold Development in the Kashiwazaki Plain and Vicinity, Niigata Prefecture
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新泻县柏崎平原及周边地区的上更新世褶皱发育
DOI：
10.5026/jgeography.105.88
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发表时间：
1996
影响因子：
3.1
通讯作者：
R. Miyawaki
中科院分区：
文献类型：
--
作者：
K. Kishi;R. Miyawaki
本文从火山碎屑、生物地层学和磁性地层学等方面，研究了日本中部柏崎平原及其附近地区上新世至早更新世褶皱构造的发育过程。在中部丘陵南部和南部，褶皱期为2.8 ~ 2.4Ma;寺守西山丘陵及其前缘大陆架褶皱期为2.0 ~ 1.5Ma;中部丘陵南部褶皱期约为1.0Ma;中部丘陵和八国丘陵北方褶皱期为0.7 ~ 0.3Ma。此外，在信浓川东侧还观察到一个活跃的褶皱，其活动开始于更新世晚期，每个褶皱阶段的寿命都相对较短，为0.4 ~ 0.5Ma。总体而言，这些褶皱活动之间的间隔在地质上是平静的，没有任何明显的褶皱活动的进展。近3 Ma以来，褶皱活动的高潮不断向东迁移.
From detailed stratigraphy including tephra, bio-and magneto-stratigraphy, we studied the process of folded structure development in Pliocene to early Pleistocene strata distributed in the Kashiwazaki plain and its vicinity, central Japan. Four folding phases are recognized; 1) from 2.8 to 2.4 Ma in the southern part and the southward of Chuo Hills, 2) from 2.0 to 1.5 Ma in Teradomari-Nishiyama Hills and its front area corresponding to continental shelf, 3) ca 1.0 Ma in the southern part of Chuo Hills, and 4) from 0.7 to 0.3 Ma in the northern part of Chuo and Hachikoku Hills. Besides them an active folding is observed in the eastern side of the Shinano River, the activity having commenced in latest Pleistocene.Each folding phase was relatively short lived from 0.4 to 0.5 Ma. In general, the intervals among these folding activities were geologically calm without any notable progress of folding activity. The culmination of folding activity had successively migrated eastward since last 3 Ma.