Termination of intra‐arc rifting at ca 16 Ma in the Southwest Japan arc: The tectonostratigraphy of the Hokutan Group

Termination of intra‐arc rifting at ca 16 Ma in the Southwest Japan arc: The tectonostratigraphy of the Hokutan Group
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日本西南岛弧弧内裂谷在约 16Ma 时终止:北丹群的构造地层学

DOI:
10.1111/iar.12366
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发表时间:
2020
期刊:
影响因子:
1.5
通讯作者:
A. Yamaji
A. Yamaji
中科院分区:
地球科学4区
文献类型:
--
作者:
Toshiki Haji;A. Yamaji

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伴随着日本海的开放,中新世弧内裂谷作用在日本西南部多个地区形成了地堑,但对该弧的伸展构造尚不清楚。在这项研究中,我们首先记录了近木地区西北部和库滩群的构造地层学,并证明了伸展构造在16.5 Ma左右结束,这是从群下部的地台被上部的沉积物不整合地复盖而推断的。其次,我们回顾了日本西南部中新世早期的地堑,认为弧内裂谷作用在16 Ma左右被遗弃,基本上与日本西南部弧旋回的结束同步,这是古地磁研究所证明的。地台数量的减少和地台填充物厚度的减小表明,日本西南部弧的伸展变形明显弱于日本东北弧(NE),后者被分成块状,表明日本东北地区存在不同程度的古地磁旋转。这种微弱的形变使得古地磁研究可以推断出日本西南部弧体的相干旋转。
Miocene intra‐arc rifting associated with the opening of the Japan Sea formed grabens in several areas in Southwest (SW) Japan, but the extensional tectonics of the arc are still not well understood. In this study, we first document the tectonostratigraphy of the Hokutan Group in the northwestern part of the Kinki district, and demonstrate the termination of extensional tectonics at ca 16.5 Ma, as inferred from grabens in the lower part of the group being unconformably overlain by sediments of the upper part. Second, we review early Miocene grabens in SW Japan to suggest that intra‐arc rifting was abandoned at ca 16 Ma, essentially simultaneously with the end of rotation of the SW Japan arc as evidenced by paleomagnetic studies. The lesser numbers of grabens and reduced thicknesses of graben fills suggest that extensional deformation of the SW Japan arc was significantly weaker than that of the Northeast (NE) Japan arc, which was broken into blocks, indicating various degrees of paleomagnetic rotation within NE Japan. The weak deformation has allowed paleomagnetic studies to infer the coherent rotation of the SW Japan arc.
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