Geological Structure of the Jirisan Metamorphic Complex of the Yeongnam Massif in the Hwagae Area, Korea

Title & Authors
Geological Structure of the Jirisan Metamorphic Complex of the Yeongnam Massif in the Hwagae Area, Korea
Lee, Deok-Seon; Kang, Ji-Hoon;

Abstract
Hwagae area, which is situated in the southeastern part of the Jirisan province, Yeongnam massif, Korea, is mainly composed of Precambrian Jirisan metamorphic rock complex (JMRC). Lithofacies distribution of the Precambrian constituent rocks mainly shows NS-trending tight fold and EW-trending open fold. This paper researched deformational phased structural characteristics of JMRC based on the geometric and kinematic features and the forming sequence of multi-deformed rock structures, and suggests that the geological structure of this area was formed through at least three phases of ductile deformation. (1) Most of structural elements related to the $\small{D_1}$ deformation were recognized as $\small{S_{0-1-2}}$ composite foliation which was transposed by the $\small{D_2}$ deformation. (2) The $\small{D_2}$ deformation occurred under the EW-directed tectonic compression, and formed the NS-trending $\small{F_2}$ fold and $\small{D_2}$ ductile shear zone which is (sub)parallel to the axial plane of $\small{F_2}$ fold. (3) The $\small{D_3}$ deformation occurred under the NS-directed tectonic compression, and partially reoriented the pre-$\small{D_3}$ structural elements into ENE or WNW direction. It indicates that the distribution of Precambrian lithofacies showing NS and EW-trending folds in the Hwagae area is closely associated with the $\small{D_2}$ and $\small{D_3}$ deformations, respectively.
Keywords
Jirisan province;Yeongnam massif;Hwagae area;Jirisan metamorphic complex;geological structure;
Language
Korean
Cited by
1.
Geometric and Kinematic Characteristics of Fracture System in the Sancheong Anorthosite Complex, Korea, The Journal of the Petrological Society of Korea, 2016, 25, 4, 389