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首页> 外文期刊>Journal of Asian earth sciences >Structural characteristics of the central Ogcheon Belt, South Korea: orogen-parallel tectonic transport model
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Structural characteristics of the central Ogcheon Belt, South Korea: orogen-parallel tectonic transport model

机译：韩国Ogcheon中央带的构造特征：造山带平行构造运移模型

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The rocks in the central Ogcheon Belt, South Korea, underwent three deformational phases (D_1, D_2 and D_3) during the Mesozoic Era. In the study area, NW- and NE-trending geological structures such as thrusts and folds are juxtaposed. The NW- and NE-trending folds deform isoclinal folds (F_1) with axial planar slaty cleavage (S_1), and have axial planar crenulation cleavage. All of these folds are overprinted by brittle faults (D_3). It is inferred from field data that the NW- and NE-trending structures are products of a single deformational phase (D_2). A very large-scale inclined NE-vergent isoclinal fold (F_1) produced an irregular boundary of Precambrian basement and a basement promontory, which acted as a structural obstacle against subsequent deformational phases. During the E-vergent phase (D_2), deformation partitioning occurred due to the irregular block boundary, and orogen-parallel and -orthogonal structures were produced. The D_3 phase is recognized as large-scale E-W trending structures including folds and faults. Thus, the structural evolution of the central Ogcheon Belt is related to the clockwise rotation of the maximum compressive stress axis from NE-SW to N-S during the Mesozoic Era. This study shows that the shape of colliding boundary is a very important factor in controlling the structural pattern and evolution in the study area.
机译：在中生代时期，韩国Ogcheon带中部的岩石经历了三个变形阶段（D_1，D_2和D_3）。在研究区域中，并列着西北和北向的地质构造，如逆冲和褶皱。 NW和NE趋势褶皱具有轴向平面板条状劈裂（S_1）的等腰褶皱（F_1），并具有轴向平面锯齿状劈裂。所有这些褶皱都被脆性断层（D_3）叠印。从现场数据可以推断出，西北走向和东北走向结构是单个变形相（D_2）的产物。大规模的倾斜NE-vergent斜向弯折（F_1）产生了前寒武纪基底和基底海角的不规则边界，这成为抵抗后续变形阶段的结构性障碍。在E-vergent相（D_2）期间，由于不规则块边界而发生了变形分配，并产生了造山带平行和正交结构。 D_3相被认为是大规模的E-W趋势结构，包括褶皱和断层。因此，在中生代时期，Ogcheon中央带的构造演化与最大压应力轴从NE-SW到N-S的顺时针旋转有关。这项研究表明，碰撞边界的形状是控制研究区域的结构模式和演化的一个非常重要的因素。

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