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http://dx.doi.org/10.7854/JPSK.2017.26.1.13

Petrology of the Syenites in Hapcheon, Korea  

Ok, Eun-Young (Department of Earth Sciences Education, Pusan National University)
Kim, Jong-Sun (Department of Geological Sciences, Pusan National University)
Lee, Sang-Won (Department of Earth Sciences Education, Pusan National University)
Publication Information
The Journal of the Petrological Society of Korea / v.26, no.1, 2017 , pp. 13-43 More about this Journal
Abstract
In the Hapcheon area, hypersthene-bearing monzonite (mangerite) and syenite are recognized. The main minerals of syenite are alkali feldspar, plagioclase, amphibole, biotite, and quartz. Anhedral hornblende and biotite are interstitial between feldspar and quartz, indicating that the hydrous minerals were crystallized later on. Based on petrochemical studies of major elements, syenite is alkaline series, metaluminous, and I-type. The variation patterns in the trace and rare earth elements of mangerite and syenite show the features of subduction-related igneous rock such as depletion of HFSE, relative enrichment in LILE to LREE, and negative Nb-P-Ti anomalies. Based on the experimental data and petrographic characteristics of the syenite, Hapcheon syenitic magma is considered to be formed by partial melting in a dry system. SHRIMP U-Pb zircon data yield the Triassic age as $227.4{\pm}1.4Ma$ in mangerite, $215.3{\pm}1.2Ma$ in syenite, and $217.9{\pm}2.6Ma$ in coarse-grained syenite, respectively. The mangerite age is similar to those of post-collisional plutonic rocks in Hongseong (226~233 Ma), Yangpyeong (227~231 Ma), and Odaesan (231~234 Ma) areas in the Gyeonggi Massif. Syenites were intruded after about 10 Ma. The features seen in the mangereite and syenite rocks can be explained by models such as the continental collision and slab break-off and the lithosphere thinning and asthenosphere upwelling model.
Keywords
Mangerite; Syenite; Dry system; Post collision; Asthenosphere upwelling;
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