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http://dx.doi.org/10.7854/JPSK.2019.28.3.217

Formation Mechanism of Recumbent Fold observed in the Bangrim-ri, Pyeongchang-gun, Korea  

Cheon, Youngbeom (Geology Division, Korea Institute of Geoscience and Mineral Resources)
Kang, Hee-Cheol (Department of Geological Sciences, Pusan National University)
Ha, Sangmin (Department of Geological Sciences, Pusan National University)
Lee, Sun-Kap (Department of Geological Sciences, Pusan National University)
Son, Moon (Department of Geological Sciences, Pusan National University)
Ryoo, Chung-Ryul (Geology Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
The Journal of the Petrological Society of Korea / v.28, no.3, 2019 , pp. 217-225 More about this Journal
Abstract
This study describes a large recumbent fold, which occurs at the north entrance slope of the Batjae tunnel, Pyeongchang-gun, Gangwon-do, and interprets its formation mechanism. The several-hundred-meter scale fold, developed in the Jeongseon Limestone of the Paleozoic Joseon Supergroup, has a nearly horizontal axial plane and its head is facing north. Stretching lineations ($L_1$) observed on the composite foliations of bedding and axial plane cleavage plunge southward at about $10^{\circ}$. Small A-type or eye-shaped sheath folds together with S-shaped asymmetrical folds are often observed in the fold limbs and their axes are nearly parallel to the lineations ($L_1$) within center and rear parts of the fold. It is thus interpreted that the recumbent fold is a large sheath fold produced by the top-to-the-north ductile shearing due to the Songrim orogeny during the late Paleozoic to Triassic.
Keywords
Pyeongchang; Jeongseon limestone; recumbent fold; sheath fold; ductile shearing;
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