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http://dx.doi.org/10.7854/JPSK.2011.20.2.077

The Characteristic of Mangerite and Gabbro in the Odaesan Area and its Meaning to the Triassic Tectonics of Korean Peninsula  

Kim, Tae-Sung (Department of Earth and Environmental Sciences and The Earth and Environmental Science System Research Center Chonbuk National University)
Oh, Chang-Whan (Department of Earth and Environmental Sciences and The Earth and Environmental Science System Research Center Chonbuk National University)
Kim, Jeong-Min (Division of Earth and Environmental Sciences, Korea Basic Science Institute)
Publication Information
The Journal of the Petrological Society of Korea / v.20, no.2, 2011 , pp. 77-98 More about this Journal
Abstract
The igneous complex consisting of mangerite and gabbro in the Odaesan area, the eastem part of the Gyeonggi Massif, South Korea, intruded early Paleo-proterozoic migmatitic gneiss. The mangerite is composed of orthopyroxene, clinopyroxene, amphibole, biotite, plagioclase, pethitic K-feldspar, quartz. The gabbro has similar mineral assemblage but gabbro has minor amounts of amphibole and no perthitic K-feldspar. The gabbro occurs as enclave and irregular shaped body within the mangerite, and the boundary between the mangerite and gabbro is irregular. Leucocratic lenses with perthitic K-feldspar are included in the gabbro enclaves. These textures represent mixing of two different magmas in liquid state. SHRIMP U-Pb zircon age dating gave $234{\pm}1.2$ Ma and $231{\pm}1.3$ Ma for mangerite and gabbro, respectively. These ages are similar with the intrusion ages of post collision granitoids in the Hongseong (226~233 Ma) and Yangpyeong (227~231 Ma) areas in the Gyeonggi Massif. The mangerite and gabbro are high Ba-Sr granites, shoshonitic and formed in post collision tectonic setting. These rocks also show the characters of subduction-related igneous rock such as enrichment in LREE, LILE and negative Nb-Ta-P-Ti anomalies. These data represent that the mangerite and gabbro formed in the post collision tectonic setting by the partial melting of an enriched lithospheric mantle during subduction which occurred before collision. The heat for the partial melting was supplied by asthenospheric upwelling through the gab between continental and oceanic slabs formed by slab break-off after continental collision. The distribution of post-collisional igneous rocks (ca. 230 Ma) in the Gyeonggi Massif including Odaesan mangerite and gabbro strongly suggests that the tectonic boundary between the North and South China blocks in Korean peninsula passes the Hongseong area and futher exteneds into the area between the Yangpyeong-Odaesan line and Ogcheon metamorphic belt.
Keywords
Gyeonggi Massif; Odaesan; Mangerite; Gabbro; Triassic; Post collision tectonic setting;
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Times Cited By KSCI : 7  (Citation Analysis)
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