Fault structures and K-Ar dating of the Northern part of Koshiki Islands, west of Kyushu, Southwest Japan
Fault structures and K-Ar dating of the Northern part of Koshiki Islands, west of Kyushu, Southwest Japan
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日本西南部九州西部古色群岛北部的断层结构和 K-Ar 测年
DOI：
10.4096/jssj.64.149
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
S. Kiyokawa
中科院分区：
文献类型：
--
作者：
S. Tonai;T. Itaya;Hisashi Oiwane;S. Kiyokawa
九州西部的越敷群岛由上白垩纪至古近纪的沉积岩和一些火成岩组成。该地区是了解九州西部地区地层和构造的最佳地点之一。根据断裂的特征及其相互间的横切关系，将研究区划分为两个断裂系统。一个是NW-SE向正断层系统（F1断层），另一个是NNE-SSW向走滑正断层系统（F2断层）。其中一条F1断裂的K-Ar年龄为17.9- 24.8Ma。
The Koshiki Islands in western Kyushu consist of the Upper Cretaceous to Paleogene sedimentary rocks and some igneous rocks. This area is one of the best places to understand the stratigraphy and structures of western Kyushu area. These structural data enable us to reconstruct the tectonic history of this area.Based on the characteristics of faults and their crosscutting relationship, we identified two fault systems in the study area. One is the NW-SE trending normal fault system (F1 faults) and the other is the NNE-SSW trending oblique-slip normal fault system (F2 faults). K-Ar ages from one of F1 faults range 17.9-24.8 Ma.