慶州 南山일대의 花崗巖의 岩石學 및 地球化學의 特性
(주)코리아스칼라
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- 2023.04.05
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- 1990.04
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서지정보
ㆍ발행기관 : 한국지구과학회
ㆍ수록지정보 : 한국지구과학회지 / 11권 / 1호
ㆍ저자명 : 윤성효, 황인호
영어 초록
Granitic rocks around Namsan area, Kyeongju, were studied from petrographic and petrochemical point of view. The Naman granite is generally medium to coarse grained hypersolvus granite dominated by pink K-feldspar and quartz, and shows miarolitic cavities. K-feldspar is the most abundant mineral(57-64% in volume), forming tabular microperthite crystals, or granophyric intergrowths with quartz. Plagioclase($lt;0.3%) appears only as perthitic streaks in microcline perthite. It contains biotite(X=pale brown, Y=Z=brown), blue amphibole(X=deep blue, Z=pale to inky blue) and fluorite. Petrochemically the Namsan granite is distinguished from the Bulgugsa granites of I-type, by higher abundance of SiO₂, K₂O, (Na₂O+K₂O) and large highly charged canons such as Nb, Y, Zr and the REE, and lower abundance of Al₂O₃, MgO, CaO, Ba, Sr, Eu, Co, Sc, Cr, and Ni. The Namsan granite shows higher strontium initial ratio(^(87)Sr/^(86)Sr) of 0.713±0.002, and the age yielded 51±1.4Ma(Rb-Sr age) to 49.3±0.9Ma(K-Ar age). These petrographic and petrochemical characteristics indicate that the Namsan granite belongs to the A-type granitoid series. And the Namsan granite is originated by direct, high-temperature partial melting of a melt depleted I-tape source rock in the lower crust.
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