Structural Geology of the Relationship Between two Geologic Terrains

有人认为，一条构造线或一个大断层位于两个地质体之间。"野冈构造线"也被认为是将日本九州的四万十带分成两部分的断层。北方为白垩纪诸冢带，南方为古近纪天皇带和日向带。"野冈构造线"被认为穿过天皇地区。所以我们进行了详细的地质调查。我们发现了一些露出地面的岩石，它们正好位于Morotsuka群和Mikado群之间的边界。但没有剪切构造。e.观察到断层泥或断层角砾岩。此外，这两组具有一致的结构和影响相同的折叠。在这两个组中也发现了相同的岩性，如纹层状岩。因此，该地区不存在"野冈构造线"。

It has been considered that a tectonic line or a large fault is situated between the two geologic terrains. "Nobeoka Tectonic Line" is also regarded as such a fault dividing the Shimanto belt into to parts in Kyushu, Japan. Northern part is the Cretaceous Morotsuka belt and southern is the Paleogene Mikado and Hyuga belts."Nobeoka Tectonic Line" is believed that it passes through Mikado area. So we carried out the detail geologic survey. We find some outcrops of the very boundary between the Morotsuka and the Mikado groups. But no shear structure, i. e. fault gouge or fault breccia is observed. Moreover these two groups have concordant structures and affected the same folding. The same lithology such as chart-laminite is also found in the both groups. Therefore "Nobeoka Tectonic Line" does not exist in this area.