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http://dx.doi.org/10.7854/JPSK.2014.23.2.105

Geological structures in the Bonghwajae area Jecheon-si, Chungcheongbuk-do, Korea  

Jung, Jin-Woo (Department of Earth and Environmental Sciences, Andong National University)
Kang, Ji-Hoon (Department of Earth and Environmental Sciences, Andong National University)
Publication Information
The Journal of the Petrological Society of Korea / v.23, no.2, 2014 , pp. 105-117 More about this Journal
Abstract
The Ogcheon and Joseon Supergroups are distributed in the Bonghwajae area, Jecheon-si, Chungcheongbuk-do, Korea which is located in the northeastern fore-end of the Ogcheon Metamorphic Zone. This paper researched the geological structures based on the geometric and kinematic characteristics and the forming sequence of the major multi-deformed rock and microstructures. Most of regional foliations are not the S0 bedding but the S0-1 composite foliations defined by the preferred orientation of stretching minerals, some are recognized as the S0-1-2 composite foliations by the preferred orientation of insoluble opaque minerals and cleavage lamella. The geological structures were formed at least by three phases of deformations i.e. NNE-SSW trending D1, E-W trending D2, N-S trending D3 compressions. The S0-1 composite foliation, which shows a similar zone-distribution trend of the constitution strata of the Ogcheon and Joseon Supergroups, trended WNW before D2 deformation, but it was reoriented into N-S which was parallel to the trend of S2 foliation by D2 deformation, and it was rearranged into NW, NE, N-S trends as it is now by D3 deformation. The structural characteristics of each deformation phase and the deformation history are very similar to those in the eastern domain of Busan area into which the Ogcheon and Joseon Supergroups in this area are extended as NNW trend. It is expected to be very valuable data in interpreting the tectonic evolution of the northeastern fore-end of the Ogcheon Metamorphic Zone.
Keywords
Ogcheon Metamorphic Zone; Bonghwajae area; Joseon Supergroup; structural characteristics of each deformation phase; deformation history;
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Times Cited By KSCI : 1  (Citation Analysis)
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