Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Presence of Leucocratic Granites of the Taebaegsan Region and Its Vicinities

태백산지역과 인근에 분포하는 우백질 화강암체의 존재

  • Yoo, Jang Han (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Koh, Sang Mo (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Moon, Dong Hyeok (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
  • 유장한 (한국지질자원연구원 광물자원연구본부) ;
  • 고상모 (한국지질자원연구원 광물자원연구본부) ;
  • 문동혁 (한국지질자원연구원 광물자원연구본부)
  • Received : 2013.11.29
  • Accepted : 2013.12.28
  • Published : 2013.12.31
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Abstract

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 $K_2O$ and $Na_2O$.

태백산지역과 주변의 선캠브리아기 고기 화강편마암류 및 고생대 퇴적변성암류 분포지역에 산포되는 소규모 암주상 우백질(알카리) 화강암류는 기존 연구에서 다소 기재가 등한시되어왔다. 그 구분을 위하여 야외노두의 육안상 차이, 광물조성 및 지화학적 특성 등을 파악하였다. 고기 화강편마암(고기 화강암질암)류는 미그마타이트조직을 나타내거나, 유색광물류에 의한 편마구조가 뚜렷한 편이다. 그리고, 부분적으로는 석영과 장석류의 녹회색화로 어두운 암색을 나타내거나, 복운모화강암이나 우백질화강암의 특성을 나타내기도 한다. 이에 비하여 후기 우백질화강암류는 훨씬 밝은 암색을 나타내며 구성광물은 석영, 장석류, 백운모 외에 각섬석류, 견운모, 전기석류 및 레피도라이트(lepidolite) 등을 소량 포함하기도 한다. 모든 우백질 화강암류는 칼크-알카리계열이며, 과알루미나형으로서 S-형에 속한다. 또한, 이들은 분화를 거치면서 알바이트화(albitization) 등에 의하여 CaO와 철함량이 상대적으로 감소하였으며, 영운암화(greisenization) 작용으로 인하여 $K_2O$와 $Na_2O$는 부화되었다.

Keywords

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  1. Petrological characteristics of the Yeongdeok granite vol.23, pp.2, 2014, https://doi.org/10.7854/JPSK.2014.23.2.31
  2. Characteristics of the Small Scale Leucocratic Granites in the Eastern Parts of the Taebaegsan Region, Korea vol.23, pp.4, 2014, https://doi.org/10.7854/JPSK.2014.23.4.375