Metamorphic and Tectonic Evolution of the Hwacheon Granulite Complex, Central Korea: Composite P-T Path Resulting from Two Distinct Crustal-Thickening Events |
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| Authors: | LEE SEUNG RYEOL; CHO MOONSUP |
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| Institution: | 1GEOLOGY DIVISION, KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES, TAEJON, 305-350 SOUTH KOREA
2SCHOOL OF EARTH AND ENVIRONMENTAL SCIENCES, SEOUL NATIONAL UNIVERSITY, SEOUL, 151-742 SOUTH KOREA |
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| Abstract: | The Hwacheon granulite complex (HGC), occupying the northeasternmargin of the Gyeonggi massif, consists mainly of garnetiferousleucocratic gneiss and leucogranite together with minor kyanite–garnetgneiss, aluminous gneiss, mafic granulite and garnet amphibolite.Mineral assemblages and reaction textures in various rock typesof the HGC document five distinct metamorphic stages: pre- (M1)and peak (M2) granulite-facies metamorphism; lower temperature,high (M3) and low (M4) pressure upper amphibolite-facies metamorphism;and local retrogression (M5) producing andalusite-bearing assemblages.Each metamorphic stage can be integrated to give a compositeP–T path consisting of two distinct trajectories, characterizedby clockwise P–T loops at relatively high and low temperatures,respectively. The first P–T trajectory (M1–M3) correspondsto a Palaeoproterozoic tectonometamorphic event responsiblefor the formation of the granulite complex at |
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