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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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초록· 키워드
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The Mesozoic leucocratic granite in the northeastern margin of the Taebaeksan Basin was transformed to protomylonite and mylonite. Mylonitic foliations generally strike to NWWNW and dip to NE with the development of a sinistral strike-slip (top-to-the-northwest) shear sense. Grain-size reduction of feldspar in the mylonitized leucocratic granite occurred due to fracturing, myrmekite formation and neocrystallization of albitic plagioclase along the shear fractures of K-feldspar porphyroclasts. As the deformation proceeded, compositional layering consisting of feldspar-, quartz- and/or muscovite-rich layers developed in the mylonite. In the feldspar-rich layer, fine-grained albitic plagioclase and interstitial K-feldspar were deformed dominantly by granular flow. On the other hand, quartz-rich layers containing core-mantle and quartz ribbons structures were deformed by dislocation creep. Based on calculations from conventional two-feldspar and ternary feldspar geothermometers, mylonitization temperatures of the leucocratic granite range from 360 to $450^{\circ}C$. It thus indicates that the mylonitization has occurred under greenschist-facies conditions. Based on the geochemical features and previous chronological data, the leucocratic granite was emplaced during the Middle Jurassic at volcanic arc setting associated with crustal thickening. And then the mylonitization of the granite occurred during the late Middle to Late Jurassic (150-165 Ma). Therefore, the mylonitization of the Jurassic granitoids in the Taebaeksan Basin was closely related to the development of the Honam shear zone.
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참고문헌 (53)
참고문헌 신청
Chang, T.W. / 1996 / Fabric development of granite mylonites in the Sunchang shear zone: 1. Grain size reduction / Journal of the Geological Society of Korea 32:421~430
Chang, T.W. / 1996 / Fabric development of granite mylonites in the Sunchang shear zone: 2. Fabric / Journal of the Geological Society of Korea 32:500~508
Cheong, C.-S. / 1996 / Tectonomagmatism,-metamorphism, and -mineralization of thecentral Ohcheon belt, Korea (I): Sr, Nd and Pb isotopicsystematics and geochemistry of granitic rocks in theBoeun area / Journal of the Geological Society of Korea 32:91~116
정기영 / 200604 / Multiple deformations along the Honam shear zone in southwestern Korea constrained by Rb-Sr dating of synkinematic fabrics: Implications for the Mesozoic tectonic evolution of northeastern Asia / LITHOS 87:289~299
조등룡 / 2007 / 강진 인근 쥬라기 엽리상 화강암류의 CHIME 모나자이트 연대측정 / 암석학회지 16(3):100~114
Chang, T.W. / 1996 / Fabric development of granite mylonites in the Sunchang shear zone: 2. Fabric / Journal of the Geological Society of Korea 32:500~508
Cheong, C.-S. / 1996 / Tectonomagmatism,-metamorphism, and -mineralization of thecentral Ohcheon belt, Korea (I): Sr, Nd and Pb isotopicsystematics and geochemistry of granitic rocks in theBoeun area / Journal of the Geological Society of Korea 32:91~116
정기영 / 200604 / Multiple deformations along the Honam shear zone in southwestern Korea constrained by Rb-Sr dating of synkinematic fabrics: Implications for the Mesozoic tectonic evolution of northeastern Asia / LITHOS 87:289~299
조등룡 / 2007 / 강진 인근 쥬라기 엽리상 화강암류의 CHIME 모나자이트 연대측정 / 암석학회지 16(3):100~114
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