초록

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Abstract ▼ AI-Helper

In the study area which is the Cretaceous sedimentary Kyokpo Basin and the basement, three types of faults are recognized: dextral strike-slip faults, normal faults and reverse faults. The strike-slip faults can be subdivided into three sets (Banwol Fault, Jongam Fault and Gunghangchi Fault). Among ...

In the study area which is the Cretaceous sedimentary Kyokpo Basin and the basement, three types of faults are recognized: dextral strike-slip faults, normal faults and reverse faults. The strike-slip faults can be subdivided into three sets (Banwol Fault, Jongam Fault and Gunghangchi Fault). Among the strike-slip faults, the Banwol fault, which is running along the northern coastline, has conjugate sinistral strike-slip faults of NW direction. The normal faults of nearly WEW direction well develop at the northeastern coastline and the reverse faults of NS direction are distributed in the western coastline. These different sets of the faults can be simultaneously formed by the compression of about 110° direction. The compression also resulted in the formation of thrusts and slumped beds or asymmetrical folds, which have well-developed NNE-NS strike of the axial plane. The thrusts and folds only occur within any particular horizons overlain by undeformed strata, indicative of syn-depositional origin. The dextral sense of strike-slip faults, the systematic development of fault systems, and the syn-depositional deformation of sediments collectively suggested that the Kyokpo Basin was formed under a dextral strike-slip regime, about 110° compressional direction. Conclusively the Kyokpo basin is interpreted as a fault wedge basin (transpressional basin) rather than a pull-apart basin (transtensional basin).

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