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초록·키워드
The study area, part of the Euisong block of the Cretaceous Kyongsang Basin, consists of the Sagog and Chunsan Formations and the Yuchon Group with volcanic rocks in ascending order. These rocks are intruded by the late Cretaceous granitoids. The sedimentary and volcanic strata are partly covered by Tertiary strata. The faults of the study area can be divided into two groups; the WNW-ESE trending, sinistral strike-slip faults represented by the Kaum fault and the dextral strike-slip faults of the NNE direction. The latter group consists of a set of major faults including the Yangsan fault. The open folds with a wavelength of 2 Km and east-trending fold axes are common and cut by the WNW sinistral strike-slip fault. The paleostress field related to the Kaum fault, indicates that σ₁ direction is approximately E-W. Another open fold with a wavelength of about 2 km and north-trending fold axis in the eastern part of the study area was probably formed by the E-W compression, together withthe Kaum fault. The dextral strike-slip fault of NNE-SSW direction was produced by NE-SW compression and cut the Kaum fault. Thus, the deformation history of the area can be interpreted as the following; (1) During the late Cretaceous time, N-S compression developed the open folds with E-W axis. (2) Compression direction was changed, being nearly E-W direction, which formed the WNW trending sinistral strike-slip fault as well as the open fold with a N-S axis. (3) These deformation events were followed by the activation of a dextral strike-slip fault of the NNE-SSW direction, caused by NE-SW compression predominating until the Late Tertiary.
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최근 본 자료 전체보기
UCI(KEPA) : I410-ECN-0101-2012-450-004403784
