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Paleomagnetic evidence for Miocene transtensional deformations at the eastern margin of the Japan Sea

机译：日本海东缘中新世伸展变形的古磁证据

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The opening of the Japan Sea backarc basin accompanied dextral, transtensional deformations in the NE Japan arc. To understand the intra-arc deformation we have studied paleomagnetism in the Uetsu area, NE Japan. Among the samples collected at 70 sites for paleomagnetic measurement reliable directions were obtained at 38 ones. About half of the sites yielded clockwise and the others show opposite declinations. Our data indicate that the northern Uetsu area rotated counterclockwise as a single block, whereas the southern Uetsu area was broken into a number of blocks that was rotated clockwise by the dextral transtension along the Nihonkoku-Miomote Line. Not only the Uetsu area but the entire eastern margin of the Japan Sea experienced such transtensional deformations in the Early to early Middle Miocene. The crust under NE Japan was broken into blocks but they rotated coherently with dextral transtension.
机译：日本海后弧盆地的开放伴随着日本东北弧的右旋，张性变形。为了了解弧内变形，我们研究了日本东北部上越地区的古磁性。在从70个地点收集的用于古磁测量的样品中，有38个获得了可靠的方向。约有一半的土地顺时针屈服，其他则呈现相反的倾斜度。我们的数据表明，上越北部地区作为一个整体逆时针旋转，而上越南部地区则被沿日本国-Miomote线的右旋向顺时针旋转分解为多个区域。在中新世早期至早期，不仅上越地区而且日本海的整个东缘都经历了这种张性变形。日本东北部的地壳被破碎成块，但随着右旋延伸而旋转。

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