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http://dx.doi.org/10.7854/JPSK.2017.26.4.385

Jiri Mountain, Korea : A Window into the Deep Crust  

Song, Yong-Sun (Department of Earth Environmental Sciences, Pukyong National University)
Park, Kye-Hun (Department of Earth Environmental Sciences, Pukyong National University)
Publication Information
The Journal of the Petrological Society of Korea / v.26, no.4, 2017 , pp. 385-398 More about this Journal
Abstract
Jiri Mountain lies in the southwestern portion of the Yeongnam massif, which is one of the Precambrian basement massifs of the Korean Peninsular, consisting essentially of high-grade metamorphic rocks. The geology of the area mainly consists of Paleoproterozoic metasedimentary migmatitic gneisses, granitic gneisses which are classified into granitic gneiss, (K-feldspar porphyroblastic) granitic gneiss and quartzo-feldspathic gneiss, charnockite and anorthosite based on their occurrence and petrographic characteristics. The ages obtained from these rocks mainly span a narrow range between ca. 1,876 and 1,856 Ma although inherited cores of zircons from massive granite gneiss yielded much older age spectrum (>2,029 Ma). The age of major metamorphism is ca. 1850-1840 Ma and the metamorphic condition obtained from mineral assemblages and geothermobarometers is about 4-6 kb and up to $700-750^{\circ}C$. These results indicate that in the area intense granitic magmatism and metamorphism occurred in the deep crust during Paleoproterozoic orogeny. Some younger age of charnockite (1,856-1,865 Ma) and anorthosite (1,861-1,862 Ma) might indicate the beginning of intraplate rifting leading to felsic and mafic magmatism just after the orogeny. In conclusion, the rocks in the Jiri Mountain area which formed at a mid to deep crustal zone provide us windows into the deep crust.
Keywords
Jiri Mountain; Precambrian; Metamorphism; Migmatite;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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