Significance of systematic changes in crenulation asymmetries within metasediments across the Ogcheon Supergroup in the Goesan area, southern Korea

Lee, Hyun-Woo (2000) Significance of systematic changes in crenulation asymmetries within metasediments across the Ogcheon Supergroup in the Goesan area, southern Korea. Geoscience Canada, 4 (2). pp. 115-134.

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Abstract

Garnet bearing metasediments from the Ogcheon Supergroup in the Goesan area, southern Korea, preserve evidence of several earlier deformation and metamorphic events, previously unrecognized. This study, based on a 3-D thin section observation of the rock, has revealed six distinctive planar structures including five foliations and micro-fold acial planes inside the porphyroblasts (S₁ to S₃) and five foliations in the matrix (S₂ to S₆), besides weak structures locally overprinting some of these matrix foliations. The rocks studied experienced early formation of shallow foliation during D₁, succeeded by NE-SW shortening (D₂), vertical shortening towards the NE-SW (D₃), NW-SE shortening (D₄) that developed the regional NE strike, vertical shortening (D₅) causing the variable dips of early planar structures, E-W shortening (D₆) causing local northwards rotation of the NE structures and some younger weak deformation.

Item ID: 12869
Item Type: Article (Refereed Research - C1)
Keywords: 3-D analysis, crenulation asymmetries, porphyroblast, NE-SW shortening, Ogcheon Orogen
ISSN: 0315-0941
Date Deposited: 11 Dec 2012 02:47
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040312 Structural Geology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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