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首页> 外文期刊>Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry >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
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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

机译：韩国京畿道的半生界高压榴辉岩和中压粒岩相变质作用：对大别-苏鲁陆相碰撞带东延的启示

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摘要

Petrological analysis,zircon trace element analysis and SHRIMP zircon U-Pb dating of retrogressed eclogite and garnet granulite from Bibong,Hongseong area,SW Gyeonggi Massif,South Korea provide compelling evidence for Triassic (231.4+-3.3 Ma) high-pressure (HP) eclogite facies (M1) metamorphisms at a peak pressure-temperature (P-T) of ca.16.5-20.0kb and 775-850 deg C.This was followed by isothermal decompression (ITD),with a sharp decrease in pressure from 20 to 10 kb and a slight temperature rise from eclogite facies (M1) to granulite facies (M2),followed by uplift and cooling.Granitic orthogneiss surrounding the Baekdong garnet granulite and the ophiolite-related ultramafic lenticular body near Bibong records evidence for a later Silurian (418+-8Ma) intermediate high-pressure (IHP) granulite facies metamorphism and a prograde P-T path with peak P-T conditions of ca.13.5 kb and 800 deg C.K-Ar ages of biotite from garnet granulites,amphibolites,and granitic orthogneisses in and around the Bibong metabasite lenticular body are 208-219 Ma,recording cooling to about 310 deg C after the Early Triassic metamorphic peak.Neoproterozoic zircon cores in the retrogressed eclogite and granitic orthogneiss provide evidence that the protoliths of these rocks were - 800 and approx 900 Ma old,respectively,similar to the ages of tectonic episodes in the Central Orogenic Belt of China.This,and the evidence for Triassic HP/ UHP metamorphism in both China and Korea,is consistent with a regional tectonic link within Northeast Asia from the time of Rodinia amalgamation to Triassic continent-continent collision between the North and South China Blocks,and with an eastward extension of the Dabie-Sulu suture zone into the Hongseong area of South Korea.
机译：韩国西南京畿道红峰地区奉峰倒积榴辉岩和石榴石粒岩的岩石学分析，锆石微量元素分析和SHRIMP锆石U-Pb测年为三叠系（231.4 + -3.3 Ma）高压（HP）提供了令人信服的证据在约16.5-20.0kb和775-850摄氏度的峰值压力-温度（PT）下的榴辉岩相（M1）变质作用，随后是等温减压（ITD），压力从20 kb急剧降低到10 kb在隆起和冷却之后，从榴辉岩相（M1）到粒状岩相（M2）略有温度升高。围绕在Baongdong石榴石粒岩上的粒状直生片岩和Bibong附近的与蛇绿岩有关的超镁铁质柱状体记录了后来的志留纪（418+ -8Ma）中高压（IHP）粒岩相变质作用和正向PT路径，其峰值PT条件约为13.5 kb和800度CK-Ar年龄的黑榴石由石榴石粒状，闪石状和花岗直片麻岩组成。 Bibong变质龙舌兰体年龄为208-219 Ma，早三叠世变质峰后记录冷却至约310℃。倒阳榴辉岩和花岗正长片岩中的新元古代锆石岩心提供了证据，表明这些岩石的原生石为-800和大约900 Ma这分别与中国中部造山带的构造事件年龄相似。这与中国和韩国的三叠纪高压/超高压变质证据相吻合，这与自20世纪90年代以来东北亚内部的区域构造联系相一致。罗丹尼亚合并到华北和华南地块之间的三叠纪大陆-大陆碰撞，并且大别-苏鲁缝合带向东延伸到韩国的洪城地区。

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