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首页> 外文期刊>Journal of Asian earth sciences >Middle Paleozoic metamorphism in the Hongseong area, South Korea, and tectonic significance for Paleozoic orogeny in northeast Asia
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Middle Paleozoic metamorphism in the Hongseong area, South Korea, and tectonic significance for Paleozoic orogeny in northeast Asia

机译：韩国洪城地区中古生界变质作用及其在东北亚古生代造山运动中的构造意义

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摘要

The Baekdong and Gwangcheon areas are located within the Hongseong collision belt of South Korea, and the discovery of late Permian-Triassic eclogites has confirmed this belt as an extension of the Qinling-Dabie-Sulu collision belt in China. The Qinling-Dabie-Sulu belt records a middle Paleozoic continental collision in addition to the late Permian-Triassic collision of the North and South China cratons. In this paper, we present evidence for middle Paleozoic igneous and metamorphic events in the Baekdong and Gwangcheon areas. Metabasites and meta-basaltic andesites in the Baekdong area originated in an arc tectonic setting at ca. 470-437 Ma, and underwent an intermediate-P/T metamorphism (6.2-8.2 kbar, 620-700 ℃) at ca. 418-405 Ma. The meta-basaltic andesite in the Gwangcheon area underwent a high-pressure granulite facies metamorphism (close to the eclogite facies) at ca. 392-381 Ma. P-T values of 15.7-19.9 kbar and 860-890 ℃ were obtained for the peak metamorphism using conventional geothermobarometry, and conditions of 16-17 kbar and 870-920℃ were estimated by thermodynamic pseudosection analysis using the Perplex X program. Together with the late Permian-Triassic eclogites previously reported from the Hongseong area, these middle Paleozoic igneous activities that were related to subduction and metamorphism indicate that the Hongseong area underwent collision in the middle Paleozoic (418-381 Ma), in addition to the late Permian-Triassic collision, as recorded in the Qinling-Dabie-Sulu belt in China.
机译：白洞和光川地区位于韩国的洪城碰撞带内，晚二叠纪-三叠纪的榴辉岩的发现已证实该带是中国秦岭-大别-苏鲁碰撞带的延伸。秦岭—大别—苏鲁带除了华北和华南克拉通晚二叠世—三叠纪外，还记录了中古生代陆相碰撞。在本文中，我们提供了白洞和光川地区中古生界火成岩和变质事件的证据。白洞地区的准玄武岩和准玄武质安山岩起源于约一世的反构造环境。 470-437 Ma，并在约200-700℃经历了中等P / T变质作用（6.2-8.2 kbar，620-700℃）。 418-405毫安。广川地区的准玄武质安山岩在约２００１年经历了高压花岗质相变质（接近榴辉岩相）。 392-381马。使用常规地热气压法测得的峰变质峰的P-T值为15.7-19.9 kbar和860-890℃，使用Perplex X程序通过热力学伪截面分析估计了16-17 kbar和870-920℃的条件。与洪城地区以前报道的晚二叠世-三叠纪榴辉岩一起，这些与俯冲和变质作用有关的中古生代火成岩活动表明，洪城地区除了晚晚期还经历了中古生界（418-381 Ma）的碰撞。中国秦岭-大别-苏鲁带记录的二叠系-三叠纪碰撞。

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