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http://dx.doi.org/10.7854/JPSK.2019.28.4.347

Characteristics of the Main Fault Zone Developed Along Yangsan Fault : On the Outcrop of Cheonjeon-ri, Dudong-myeon, Ulju-gun, Ulsan, Korea  

Ryoo, Chung-Ryul (Geology Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Cheon, Youngbeom (Geology Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
The Journal of the Petrological Society of Korea / v.28, no.4, 2019 , pp. 347-357 More about this Journal
Abstract
The main fault zone of the Yangsan Fault, located in the southeastern part of the Korean peninsula, is newly found at the Cheonjin-ri, Dudong-myeon, Ulju-gun, Ulsan, Korea. About 100 wide fault zone exposed along the Guryangcheon stream strikes N-S and dips over 70° toward east. The main fault zone is composed of N-S-striking gouge and breccia layers and enclosed lenses. Striations on the subvertical fault surfaces mainly indicate dextral slip, but moderate-angle minor reverse faults showing top-tothe-west shearing transect the foliated high-angle gouge and breccia layers. These indicate that the dextral slip along the fault, which is interpreted as the main movement of the fault, was followed by reverse slip. The fault zone is composed of N-S-striking gouge layers and enclosed, fractured lenses. Locally distributed NE-SW- to E-W-striking fault gouge layers with fractured lenses show asymmetric folds, indicating progressive dextral movement. Therefore, the exposed fault zone has a high internal complexity due to the combined effects of NNE-SSW-trending dextral shearing and E-W-trending shortening by compression. In addition, around main boundary fault between the western volcanic rocks and eastern sedimentary rocks offsets the overlying Quaternary fluvial conglomerate. This is a good example that understanding of internal structures of main fault zone (or fault core), such as the Yangsan Fault, plays an important role to study the Quaternary activity and to find the active fault.
Keywords
Yangsan fault; Main fault zone; Cheonjeon-ri; NS-trending; Right-lateral fault; Asymmetric fold; Quaternary fault;
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