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Zircon Morphology and Petrochemistry of Mesozoic Plutonic rocks in Seonsan Area, Korea  

이윤종 (경북대학교 지구과학교육과)
박순자 (송원학원)
장용성 (대구복현초등학)
정원우 (경북대학교 지구과학교육)
김중욱 (대구교육대학교 과학교육)
황상구 (안동대학교 지구환경과학)
윤성효 (부산대학교 지구과학교육과)
Publication Information
The Journal of the Petrological Society of Korea / v.13, no.2, 2004 , pp. 81-102 More about this Journal
Abstract
The plutonic rocks in Seonsan area are divided into dioritic-syenitic rock, gneissose granite, biotite granite and fine grained biotite granite. These rocks intruded into the Pre-cambrian metamorphic complex and are all covered by the Cretaceous Nakdong formation. According to modal minerals, dioritic-syenitic rock corresponds to quartz monzonite, granodiorite, tonalite fields, whereas all the other plutonic rocks fall in granite field. Petrochemically the dioritic-syenitic rock is lower in SiO$_2$ content, differentiation index and Larsen index than all the other plutonic rocks. About the zircon morphology, dioritic-syenitic rock shows (100) dominant type but other granitic rocks exhibit mixed types between (100) and (110) type. The dioritic-syenitic rock could be crystallized in higher temperature than the other plutonic rocks. The plutonic rocks correspond to calc-alkaline rock series, and belong to I-type granite and mostly magnetite-series in magmatic origin. In plutonic processes, the dioritic-syenitic rock with 5kb vapor pressure could intrude into the metamorphic batement at 17km deep below the surface. Later the gneissose granite with lower 3kb vapor pressure could intrude at 10km deep. Sequentially the biotite granite with 0.7kb could intrude at 2km deep. Finally the fine grained biotite granite with 3kb vapor pressure could intrude at 10km deep.
Keywords
plutonic rocks; petrochemistry; zircon morphology; I-type granite; plutonic process;
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