Phanerozoic high-pressure eclogite and intermediate-pressure granulite facies metamorphism in the Gyeonggi Massif, South Korea: Implications for the eastward extension of the Dabie–Sulu continental collision zone

Fast cooling following a Late Triassic metamorphic and magmatic pulse: implications for the tectonic evolution of the Korean collision belt

“…Kim et al, 2008;K.H. Kim et al, 2008;Kee, 2011;Kim et al, 2006;Kim et al, 2009;Lee et al, 2014;Oh et al, 2006bOh et al, , 2015 S.W. Kim et al, 2008;Suzuki, 2009;Yengkhom et al, 2014;Yi and Cho, 2009).…”

“…Most studies on the geology of Korea are focused on the study of high-pressure metamorphic rocks (e.g., Cho et al, 2007;Kim et al, 2006;Kwon et al, 2009;Oh et al, 2005Oh et al, , 2014Ree et al, 1996;S.W. Kim et al, 2011b), litho-tectonic units (e.g., Chough et al, 2000Chough et al, , 2013Oh, 2012;Oh et al, 2009;S.W.…”

“…The occurrence of amphibolite bodies with very rare relics of pervasively retrogressed mafic high-pressure granulite and eclogite Oh et al, 2005;Park et al, 2014b;Zhai et al, 2007) suggests subduction to depths in the order of 60-75 km. Yet, the age of subduction and collision is not well known as zircons from these rocks yielded U-Pb dates of 240 ± 5 and 231 ± 3 Ma Kim et al, 2006;Park et al, 2014b). Many mountain belts that formed by crustal thickening were later in their tectonic evolution affected by horizontal crustal extension and associated lithospheric thinning and intruded by mantle-sourced Mg-rich potassic magmatic rocks (e.g., Bianchini et al, 2008;Davies and von Blanckenburg, 1995;Tectonophysics xxx (2015) xxx-xxx Dilek and Altunkaynak, 2009;Duggen et al, 2005;Fowler et al, 2008;Gill et al, 2004;Jiang et al, 2013;Liégeois and Black, 1987;Turner et al, 1996;von Raumer et al, 2014).…”

Tectonic and deformation history of the Gyeonggi Massif in and around the Hongcheon area, and its implications in the tectonic evolution of the North China Craton: Comment

“…Recently, however, Yengkhom et al (2014) attributed the Paleoproterozoic tectonic events occurring in the Gyeonggi Massif to those related to assembly of the Eastern Block of the North China Ree et al, 1996;Oh et al, 2005Oh et al, , 2006Kim et al, 2006Kim et al, , 2011Kwon et al, 2009). corresponding to the Sulu-Dabie collision belts within eastern China, could cover the regime of the Gyeonggi that was surrounded by the Triassic Imjingang belt to the North and the Hongseong-Odesan belt to the South. Generally, the Sulu-Dabie collision belts represent the exhumed part of the subducted South China (Yangtze) continental margin (e.g., Wang and Liou, 1992;Yin and Nie, 1993;Zhang, 1997Zhang, , 2000Bryant et al, 2004;Zheng et al, 2005;Zhang et al, 2007Zhang et al, , 2009); therefore, we believe that the Gyeonggi Massif is a part of the South China Block, and the Paleoproterozoic tectonic events documented in the Gyeonngi Massif can be corresponded to the coeval tectonic events in the South China Block that was related to the assembly and accretion of the Columbia Supercontinent (e.g., Yu et al, 2012;Zhao and Cawood, 2012;Chen et al, 2013;Yin et al, 2013;Zhao et al, 2014).…”

“…Ree et al (1996) first reported a Triassic high-pressure amphibolite-facies metamorphic rock from the western Imjingang belt on the north of the Gyeonggi Massif (isochron date of 249 ± 31 Ma; 8-13 kbar and 630-790 • C), possibly evolving from eclogite facies conditions along a clockwise P-T path. Oh et al (2005) and Kim et al (2006) found Triassic eclogite-facies high-pressure metamorphic rock at Bibong (in the so-called Hongseong-Odesan belt) in the southwestern part of the Gyeonggi Massif (231 Ma; 17.0-20.9 kbar and 835-860 • C). The Triassic high-pressure metamorphism in both Imjingang and Bibong is consistent in the P-T-t paths (Oh et al, 2005).…”