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학술대회자료
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한국암석학회 한국암석학회 학술발표회 논문집 한국암석학회 2008년 학술심포지엄
발행연도
2008.2
수록면
20 - 28 (9page)

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Emplacement mechanisms of dikes are generally divided into passive injection which magma flowed in along existing fracture, and forceful injection caused by hydraulic fracturing due to magma pressure. A dominant trend and spatial distribution of dike swarm resulting from passive injection are valuable indicators for interpreting the history of regional or local crustal deformation and paleo-stress field. The dike swarms are pervasively observed in the southeast Korea. They are classified into three groups: NW-trending acidic dike swarm, and WNW -trending A - and NS~NNE-trending B-Groups of basic dike swarms. Based on their cross-cutting relationships, the earliest is the acidic dike group and followed by A- and B-Groups in succession. The acidic dikes seem to have intruded into tension gashes induced by the sinistral strike-slip faulting of the Yangsan fault system during the late Cretaceous ~ early Paleogene. Based on the K-Ar and Ar-Ar age data, A-and B-Groups were intruded during 64~52 Ma and 51~44 Ma, respectively. The result means that the direction of tensional stress in and around the SE Korean peninsula was changed abruptly from NNE-SSW to EW~WNW-ESE at about 51 Ma. Considering the tectonic environments during the Paleogene, it is interpreted that A-Group was injected along the WNW-trending tensional fractures developed under a regional sinistral simple shear regime by the north-northwestward oblique subduction of the Pacific plate beneath the Eurasian plate. Meanwhile the regional stress caused by the collision of India and Eurasia continents at about 55 Ma was likely propagated to the East Asia at about 51 Ma, and then the East Asia including the Korean peninsula was extruded eastwards as a trench-rollback and the dip of downgoing slab of the Pacific plate was abruptly steepened. As a result, the strong suction-force along the plate boundary produced a tensional stress field trending EW or WNW-ESE in and around the Korean peninsula, which resultantly induced B-Group to intrude passively into the study area.

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UCI(KEPA) : I410-ECN-0101-2009-459-014949988