Miocene intra‐arc bending at an arc–arc collision zone, central Japan: Reply
Miocene intra‐arc bending at an arc–arc collision zone, central Japan: Reply
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日本中部弧-弧碰撞带的中新世弧内弯曲：回复
DOI：
10.1046/j.1440-1738.1999.t01-1-00227.x
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发表时间：
1997
期刊：
影响因子：
1.5
通讯作者：
Kazuo Saito
中科院分区：
文献类型：
--
作者：
Masaki Takahashi;Kazuo Saito
摘要本文综述了近年来日本中部的古地磁研究，试图阐明日本中部弧内变形与伊豆-小笠原弧碰撞构造之间的关系。日本中部前新第三纪构造的尖突构造被称为关东构造结，表明其起源与伊豆-小笠原弧碰撞。关东山脉的古地磁结果和新获得的放射性年龄揭示了关东构造结东翼中新世的旋转历史。关东山脉在中新世秩父盆地沉积后发生了90°以上的顺时针旋转（N.8的南极有孔虫带：16.6-15.2 Ma）。综合日本列岛的古地磁数据和日本中部的碰撞构造后，看来大约半旋转（40-50°）可能发生在约15 Ma，与日本西南部的快速旋转有关。剩余的（50-40°）持续到6 Ma，导致前新近纪增生杂岩（关东结）的急剧弯曲结构。后者的旋转似乎是由伊豆-小笠原弧对向西北迁移的菲律宾海板块的碰撞造成的。
Abstract Recent paleomagnetic studies are reviewed in an effort to clarify the relationship between the intra-arc deformation of central Japan and the collision tectonics of the Izu-Bonin Arc. The cusp structure of the pre-Neogene terranes of central Japan, called the Kanto Syntaxis, suggests a collisional origin with the Izu-Bonin Arc. The paleomagnetic results and newly obtained radiometric ages of the Kanto Mountains revealed the Miocene rotational history of the east wing of the Kanto Syntaxis. More than 90° clockwise rotation of the Kanto Mountains took place after deposition of the Miocene Chichibu Basin (planktonic foraminiferal zone of N.8: 16.6–15.2 Ma). After synthesizing the paleomagnetic data of the Japanese Islands and collision tectonics of central Japan, it appears that approximately a half rotation (40–50°) probably occurred at ca 15 Ma in association with the rapid rotation of Southwest Japan. The remainder (50-40°) continued until 6 Ma, resulting in the sharp bent structure of the pre-Neogene accretionary complexes (Kanto Syntaxis). The latter rotation seems to have been caused by the collision of the Izu-Bonin Arc on the northwestward migrating Philippine Sea Plate.