秋吉造山运动之外:揭示日本西部山口县美祢秋吉台地区二叠纪增生复合体的倾覆结构和构造过程

Koji Wakita, Masao Kametaka
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摘要

秋吉造山带的概念产生于对翻转的秋吉石灰岩的地质研究。然而,我们对秋吉石灰岩周围硅质碎屑岩的地层和地质结构的了解仍不全面。在本研究中,我们对分布在秋吉灰岩北侧的别府单元进行了地质调查,发现硅质碎屑岩内部也发生了大规模的地层翻转,而硅质碎屑岩是在增生复合体中形成的海洋板块地层的上部。此外,被视为前弧或海沟斜坡盆地沉积物的常盛地层也经历了翻转。因此,整个美祢-秋吉台地区的增生复合体都存在广泛的倾覆结构。为了了解增生复合体中这些倾覆结构背后的机理,我们重点研究了增生楔和大块海山以及逆止器之间相互作用所产生的碰撞和变形。前弧或斜坡盆地沉积物的翻转表明,在华南和华北地块碰撞期间,可能发生了沿大型侧向断层的增生后变形。这些增生期间和增生之后的构造事件可能代表了秋吉造山运动的真实性质。 专题文集:本文是蛇绿岩、熔岩和蓝晶岩文集的一部分,可在以下网址查阅:https://www.lyellcollection.org/topic/collections/ophiolites-melanges-and-blueschists。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Beyond the Akiyoshi Orogeny: unravelling overturned structures and tectonic processes in the Permian accretionary complex of the Mine-Akiyoshidai Area, Yamaguchi, western Japan
The concept of the Akiyoshi Orogeny emerged from the geological study of the overturned Akiyoshi Limestone. However, our understanding of the stratigraphy and geological structure of the siliceous-clastic rocks surrounding the Akiyoshi Limestone remains incomplete. In this study, we conducted a geological survey within the Beppu unit, distributed on the north of the Akiyoshi Limestone, revealing substantial-scale strata overturning even within the siliceous-clastic rocks, which formed as the upper section of the ocean plate stratigraphy within the accretionary complex. Additionally, the Tsunemori Formation, which is regarded as sediments of forearc or trench-slope basin, has also undergone overturning. Consequently, extensive overturned structures exist throughout the entire accretionary complex of the Mine-Akiyoshidai Area. To understand the mechanism behind these overturned structures within the accretionary complex, we focused on the collision and deformation resulting from the interaction between the accretionary wedge and a massive seamount along with the backstop. The overturning of the forearc or slope basin sediments suggested that post-accretion deformation along the large lateral fault may have occurred during the time of the collision between the South China and North China blocks. These tectonic events during and after accretion may represent the true nature of the Akiyoshi Orogeny. Thematic collection: This article is part of the Ophiolites, melanges and blueschists collection available at: https://www.lyellcollection.org/topic/collections/ophiolites-melanges-and-blueschists
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