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Possible eastward extension of Chinese collision belt in South Korea; the Imjingang Belt

Jin-Han Ree, Moonsup Cho, Sung-Tack Kwon and Eizo Nakamura
Possible eastward extension of Chinese collision belt in South Korea; the Imjingang Belt
Geology (Boulder) (December 1996) 24 (12): 1071-1074


Structural, petrological, and geochronological data from the middle Korean peninsula indicate that the Qinling-Dabie-Sulu collisional 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 Barrovian-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 degrees 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.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 24
Serial Issue: 12
Title: Possible eastward extension of Chinese collision belt in South Korea; the Imjingang Belt
Affiliation: Korea University, Department of Earth and Environmental Sciences, Seoul, South Korea
Pages: 1071-1074
Published: 199612
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 31
Accession Number: 1997-000004
Categories: Structural geologyGeochronologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
N38°00'00" - N38°15'00", E126°45'00" - E127°30'00"
Secondary Affiliation: Seoul National University, KOR, South KoreaYonsei University, KOR, South KoreaOkayama University at Misasa, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199701
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