Possible eastward extension of Chinese collision belt in South Korea: The Imjingang belt

Jin Han Ree, Moonsup Cho, Sung Tack Kwon, Eizo Nakamura

Research output: Contribution to journalArticlepeer-review

225 Citations (Scopus)

Abstract

Structural, petrological, and geochronological data from the middle Korean peninsula indicate that the Qinling-Dabie-Sulu cullisional belt of east-central China crosses the Yellow Sea and extends into the Imjingang belt. The Yeoncheon complex, first identified as the western Imjingang belt, comprises primarily north-dipping metamorphic sequences: (1) the northern Jingok unit, consisting of Harrovian-type metapelites, and (2) the southern Samgot unit, consisting of calc-silicate and amphibolitic rocks. South-vergent structures with reverse-sense shearing are dominant in the Jingok unit, whereas late normal-sense shearing is pervasive in the Samgot unit and the deformed granitoid to the south. These structural patterns are interpreted to correspond to extensional deformation associated with uplift following compression in a collisional belt. Pressure-temperature (P-T) estimates from the amphibolites suggest a high-P amphibolite-facies metamorphism (8-13 kbar and 630-790°C), possibly evolving from eclogite facies conditions along a clockwise P-T path. Sm-Nd and Rb-Sr geochronological data suggest that the amphibolites emplaced in Late Proterozoic time were metamorphosed during Permian-Triassic time.

Original languageEnglish
Pages (from-to)1071-1074
Number of pages4
JournalGeology
Volume24
Issue number12
DOIs
Publication statusPublished - Dec 1996

ASJC Scopus subject areas

  • Geology

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