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Tertiary Dyke Swarms and their Tectonic Importance in the Southeastern Part of the Korean Peninsula  

Kim, Jin-Seop (Department of Geology, Pusan National University)
Son, Moon (Department of Geology, Pusan National University)
Kim, Jong-Sun (Department of Geology, Pusan National University)
Kim, In-Soo (Department of Geology, Pusan National University)
Publication Information
The Journal of the Petrological Society of Korea / v.11, no.3_4, 2002 , pp. 169-181 More about this Journal
Abstract
Basic~intermediate dike swarms are pervasively developed in the east of the Ulsan Fault, SE Korea. Most of them intruded initially along the NS-trending extensional fractures which developed under EW extension during the East Sea opening in the Early Miocene (before about 17 Ma). The mean-strikes of the basic dikes intruding into the granites are more clockwise rotated in farther eastern side, i. e.$ N06^{\circ}$E, $Nl5^{\circ}$E, and $N37^{\circ}$E in the western side, in the just vicinities, and in the eastern side of the YBonil Tectonic Line (YTL), respectively. And the mean-strike of the basic dikes nearby shoreline is also most clockwise rotated ($N75^{\circ}$E in the Guryongpo Peninsula). The spatial variance indicates that the dikes, located only in the east of the YTL, experienced horizontal-clockwise rotation, and that the dikes in farther east from the YTL experienced more clockwise rotation. It is, thus, supported that the NNW dextral shear stress, generated by the spreading of the East Sea, was propagated toward inland from eastern continental margin of the Korean Peninsula, and that the YTL is an westernmost limit of the clockwise crustal rotations which are pervasively observed in the vicinities of the Miocene basins, SE Korea.
Keywords
SE Korea; Dike swarm; Yeonil Tectonic Line; Spreading of East Sea Clockwise rotation;
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