자원환경지질 (Economic and Environmental Geology)
- 제24권4호
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- Pages.379-391
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- 1991
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- 1225-7281(pISSN)
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- 2288-7962(eISSN)
문경남부일대(聞慶南部一帶)에 분포(分布)하는 백악기(白堊紀) 화강암류(花崗岩類)의 미량원소(微量元素) 및 광물화학(鑛物化學)
Trace Element and Mineral Chemistry of the Cretaceous Granites in the Southern Mungyeong Area
- 윤현수 (한국자원연구소)
- Yun, Hyun Soo (Korea Institute of Geology, Mining and Materials)
- 투고 : 1991.07.21
- 발행 : 1991.08.31
초록
The studied Cretaceous granties are widely distributed at the southern Mungyeong area in the southwestern part of Ogcheon Fold Belt. From the mineralogical and geochemical compositions, it is suggested that they show the characteristics of I-type and magnetite-series and formed under the conditions of high oxygen fugacity. The mineral chemistry of plagioclase, alkali feldspar and biotite in the granites by EMPA, was revealed as albite to oligoclase, microcline to microcline perthite and orthoclase perthite, and annite compositions, respectively. The granites have the distribution patterns of enriched LREE and depleted HREE, and show Eu negative anomalies suggesting mainly due to the feldspar fractionation in the residual magma. The geochemical data of Eu, EU/
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