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The block rotation in the Uetsu area, Northern Part of Niigata Prefecture, Japan

机译:日本新泻县北部上越地区的地块旋转

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Paleomagnetic and geologic studies were made in the Uetsu area, NE Japan, to clarify the Miocene intra-arc-deformation associated with the Japan Sea opening. We obtained paleomagnetic directions from the Early to Middle Miocene pyroclastic rocks and lavas in the area. The average paleomagnetic direction is D = 28.0°, I = 48.7°and α_(95) = 9.6°. It suggests that the clockwise rotation occurred in this area, which is opposite to the counter-clockwise rotation of NE Japan. A fault was discovered which could be the boundary of this rotating domain. The dextral movement is recognized for this fault, concordant with the clockwise rotation in the area. These paleomagnetic and structural data suggest that the clockwise block rotations occurred in the Uetsu area, accompanied by the dextral deformation.
机译:在日本东北部上越地区进行了古磁学和地质学研究,以阐明与日本海开放有关的中新世弧内形变。我们获得了该地区早中新世至中新世火山碎屑岩和熔岩的古磁方向。平均古磁方向为D = 28.0°,I = 48.7°和α_(95)= 9.6°。这表明该区域发生了顺时针旋转,这与NE Japan的逆时针旋转相反。发现了一个故障,它可能是该旋转域的边界。根据该区域的顺时针旋转,可以识别出该故障的右旋运动。这些古磁性和结构性数据表明,在上越地区发生了顺时针旋转,并伴有右旋变形。

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