Introduction of Several Albitite-greisen Type Deposits of Korea

Yoo, Jang Han; Koh, Sang‐Mo; Moon, Dong Hyeok

doi:10.9727/jmsk.2012.25.4.221

Cited by 3 publications

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“…연구 지역 내 우백질화강암류는 지역에 따라서 생성광물 종류에 차이를 나타낸다. 울진군 서면 왕피리 일대 는 리치움운모(레피도라이트, lepidolite)뿐 아니라, 석석(Sn)이 페그마타이트에서 개발되었으며 (Moon et al, 1996), 화강암체에서도 리치움이 확인된다 (Yoo et al, 2012). White and Chappel, 1983;Hyndman, 1985).…”

Section: 서 언unclassified

Presence of Leucocratic Granites of the Taebaegsan Region and Its Vicinities

Yoo¹,

Koh²,

Moon³

2013

Journal of the Mineralogical Society of Korea

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: The Taebaegsan region and its vicinities mainly consist of Precambrian granitic gneisses and Cambrian meta-sedimentary rocks. And lots of leucocratic(alkali) granites smaller than the stocks are found here and there. Therefore the presence of leuco-granites is not properly described yet in the former studies. For the effective distinction of several granitic rocks, outcrop characteristics, mineral identification, and petro-chemical properties were studied. Some part of granitc gneisses could be classified into typical metamorphic rocks such as migmatites and banded gneisses. And some shows rather dark appearance with gray quartz and feldspars, and others two mica granites, leucocratic ones etc. But all of leucocratic granites of the region usually show bright milky white to beige color. Since they mainly consist of quartz, feldspars, muscovite, and small amounts of sericites, amphiboles, tourmaline and lepidolite. And all of alkali granites belong to the calc-alkalic, peraluminous and S-type in character. During magmatic differentiation of leucocratic granites, CaO and total Fe contents are clearly decreased than those of the older granitic rocks. On the other hand, magmatic evolution also had induced the greisenization and albitization which enriched the relative amounts of alkali elements such as K2O and Na2O.

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Section: 서 언unclassified

Presence of Leucocratic Granites of the Taebaegsan Region and Its Vicinities

Yoo¹,

Koh²,

Moon³

2013

Journal of the Mineralogical Society of Korea

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“…그러 나 지향사 이론이 쇠퇴하고 판구조론이 힘을 얻으면 서, 해양지각이 대륙지각 하부로 섭입되면서 관입하 는 화강암류는 내륙 쪽으로 알칼리성분(K 2 O+Na 2 O)이 증가하는 특성이 있는 것으로 알려졌다 (Dewey and Bird, 1970). Hwang et al, 1996;Kim et al, 1963;Yun and Shin, 1963 et al, 2011;Hong, 1996;Moon and Park, 1994;Moon et al, 1996;Park et al, 1988;Stemprok, 1987;Yoo et al, 2012). 특히 최근의 첨단 산업에서 그 용도가 증대되는 Nb, Ta, Ti 등 희유금속류 및 희토류(REEs) 자원은 알칼리성분이 풍 부한 우백질화강암류의 알비타이트-그라이젠화와도 밀 접한 관련을 가진다 (Guilbert and Park, 2007;Haapala and Rämö, 1992).…”

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Characteristics of the Small Scale Leucocratic Granites in the Eastern Parts of the Taebaegsan Region, Korea

Yoo¹,

Ryoo²

2014

The Journal of the Petrological Society of Korea

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Precambrian granitic gneisses and Cambrian meta-sedimentary rocks are prevalently distributed in the eastern part of the Taebaegsan region, and biotite granitic batholith of the Jurassic period (?) is found in the southern part of Uljin-si. But small scale leucocratic granitic stocks which commonly found here and there have been rather neglected in the previous studies. The presence of leucocratic granites could be differentiated from the older granitic rocks and biotite granite through the outcrop characteristics, mineral species and geochemical compositions. For the effective comparison between the older granitic rocks and leucocratic ones, pale gray to gray coloured Hongjesa granitic gneiss with granular texture was selectively chosen. The Hongjesa granitic gneiss and biotite granite usually have rather plenty of coloured minerals such as biotite and chlorites. But the leucocratic granites often show sericitic alteration due to the albitization and greisenisation during the post-magmatic alteration, and shows rather bright appearance because of poor amount of coloured minerals. Since all of granitic rocks passed rather high degrees of magmatic differentiation, they belong to calc-alkalic and peraluminous in their characters. Among the alkali elements of the leucocratic rocks K 2 O shows higher increase than those of the other granitic rocks, and Na 2 O only represents slight decrease than those of the Hongjesa granitic gneiss and Uljin granite. On the other hand, CaO and total Fe content are clearly decreased than those of the Hongjesa granitic gneiss and Uljin granite.

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Petrological characteristics of the Yeongdeok granite

Woo¹,

Jang²

2014

The Journal of the Petrological Society of Korea

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The Yeongdeok granite emplaced in the eastern Yeongyang subbasin is typically a medium-to coarse-grained massive biotite granite. It intruded into Precambrian schist & gneiss complex and is unconformably overlain by Cretaceous sedimentary rocks. In this study, we attempt to investigate the magma type which formed Yeongdeok granite and estimate the emplacement depth using Al-in-hornblende geobarometer to mineral composition. According to the magma fractionation, TiO 2 , Al 2 O 3 , Fe 2 O 3 *, FeO, Fe 2 O 3 , MnO, MgO, CaO, Na 2 O and P 2 O 5 show positive trend but K 2 O indicate negative trend with SiO 2 contents. Those are identified as calc-alkaline series in AFM diagram and show the chemical characteristics of the I-type magma through the oxidation tendency of the iron ion and the portion of the alkaline composition. When calculated using the equation of Hollister et al. (1987), the emplacement depths of the Yeongdeok granite range from 8.98 to 17.19 km and average depth was estimated 13.03 km approximately.

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Introduction of Several Albitite-greisen Type Deposits of Korea

Abstract: -222 -rocks which are especially favorable to the ore depositions. And the presence of alkali granites which formed in the later magmatic evolution are well known to be worthwhile to the prospections of various rare metals and REEs resources.

Cited by 3 publications

References 10 publications

Presence of Leucocratic Granites of the Taebaegsan Region and Its Vicinities

Presence of Leucocratic Granites of the Taebaegsan Region and Its Vicinities

Characteristics of the Small Scale Leucocratic Granites in the Eastern Parts of the Taebaegsan Region, Korea

Petrological characteristics of the Yeongdeok granite

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