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首页> 外文期刊>Journal of Asian earth sciences >Multiple metamorphic episodes recorded in the Paleozoic Pyeongan Supergroup on the northeastern margin of the Yeongnam massif, South Korea: Implications for the Songrim (Indosinian) orogeny
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Multiple metamorphic episodes recorded in the Paleozoic Pyeongan Supergroup on the northeastern margin of the Yeongnam massif, South Korea: Implications for the Songrim (Indosinian) orogeny

机译：韩国Yeongnam断层东北缘古生代平南超级群中记录的多个变质事件：对松林（印支期）造山运动的影响

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摘要

Metasedimentary rocks of the Pyeongan Supergroup, which occur as roof pendants on the northeastern margin of the Yeongnam massif, South Korea, preserve a record of the impact of the Late Permian-Triassic Songrim (Indosinian) orogeny in the eastern Eurasia margin. Metamorphic results of this paper have revealed that the metasedimentary rocks were affected by three metamorphic events during the Middle Permian to Middle Mesozoic. Representative mineral assemblages from three metamorphic zones I, II and III are Cld + And Ky +/- St, Grt + St + Ky + Bt +/- And, and And + Sill + Bt +/- Grt +/- St, respectively. Kyanite and sillimanite paramorphs after andalusite occur in zones I and III, respectively. Metamorphic P-T conditions and paths were determined from conventional geothermobarometers and compositional isopleths of chloritoid, staurolite, and garnet on P-T pseudosections in the MnO-Na2O-CaO-K2O-FeOMgO-Al2O3-SiO2-H2O (MnNCKFMASH) and KFMASH-T (TiO2)-O (Fe2O3) systems. In the study area, the Pyeongan Supergroup experienced medium pressure regional metamorphism (M1 and M2) belonging to greenschist to amphibolite fades followed by thermal metamorphism (M3). The M1 metamorphism occurred at 450-500 degrees C and 2-4 kbar and produced the kyanite paramorph after andalusite. The M2 metamorphism occurred at 520-600 degrees C and 4-6 kbar, and was associated with the growth of garnet, staurolite, and kyanite. The later thermal metamorphism occurred at ca. 580 degrees C and ca. 4 kbar, and was caused by intrusion of Jurassic granitoids. The medium pressure regional metamorphism (M1 and M2) have occurred around 270 Ma during the Songrim orogeny based on the SHRIMP U-Pb zircon ages. (C) 2015 Elsevier Ltd. All rights reserved.
机译：平壤超群的准沉积岩以屋顶垂饰形式出现在韩国Yeongnam地块的东北边缘，保留了欧亚大陆东缘晚二叠纪-三叠纪松林（印度支那）造山运动的影响的记录。本文的变质结果表明，在二叠纪至中生代期间，沉积物岩石受到了三个变质事件的影响。来自三个变质带I，II和III的代表性矿物组合分别为Cld +和Ky +/- St，Grt + St + Ky + Bt +/- And和And + Sill + Bt +/- Grt +/- St 。红柱石之后的蓝晶石和硅线石变质分别出现在I区和III区。通过常规的地热气压计以及MnO-Na2O-CaO-K2O-FeOMgO-Al2O3-SiO2-H2O（MnNCKFMASH）和KFMASH-T（TiO2）中PT假切片上的类绿藻，星形石和石榴石的组成等值线确定变质PT条件和路径。 -O（Fe2O3）系统。在研究区中，平安超级群经历了中压区域变质作用（M1和M2），属于绿片岩到闪石的褪色，接着是热变质作用（M3）。 M1变质发生在450-500摄氏度和2-4 kbar，并在红柱石之后生成蓝晶石变形。 M2变质发生在520-600摄氏度和4-6 kbar，并且与石榴石，星形石和蓝晶石的生长有关。后来的热变质发生在约。约580摄氏度4 kbar，是由于侏罗纪花岗岩侵入造成的。基于SHRIMP U-Pb锆石年龄，在Songrim造山过程中，中压区域变质作用（M1和M2）发生在270 Ma左右。 （C）2015 Elsevier Ltd.保留所有权利。

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