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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)
윤현수,Yun, Hyun Soo 대한자원환경지질학회 1991 자원환경지질 Vol.24 No.4
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/$^*Eu$, Sm and Gd suggest that the granites of the area have more abundant alkali feldspar crystallization than plagioclase. From the geochemical characteristics of Sr/Ba, La/Sm vs. Ce/Yb and other trace element evidences, the granites were the late stage products of differentiation and fractionated from a homogeneous parental granitic magma.
함백분지(咸白盆地) 남부지역(南部地域)에 분포(分布)하는 백악기(白堊紀) 화강암질암류(花崗岩質岩流)의 암석화학적(岩石化學的) 연구(硏究)
윤현수,Yun, Hyun Soo 대한자원환경지질학회 1986 자원환경지질 Vol.19 No.no.spc
The Geodo granodiorite intruded into the Joseon Supergroup is fine-grained at the marginal part, and medium-grained and more leucocratic at the central part. The Quartz monzonite porphyry intruded inte Precambrian granite and Geodo granodiorite has abundant plagioclase phenocryst. The Imog granite intruded into the Yulri Group and the Joseon Supergroup is mediumgrained biotite granite with partly pinkish feldspar phenocryst. The K/Ar ages obtained from the biotite of the Geodo granodiorite and Imog granite are Early ($111{\pm}1{\sim}107{\pm}1$ Ma) and Late ($93{\pm}1{\sim}92{\pm}1$ Ma) Cretaceous, respectively. The K/Ar sericite age of the quartz-sericite zone of the lower Jangsan quartzite occuring in the western area gave much younger age (about 170 Ma) than that of the Jangsan quartzite, that might be reset due to the regional metamorphism of the Daebo orogeny. The granitic rocks of the area are felsic to mafic, metaluminous to peraluminous, calc-alkalic (alkali-lime index${\fallingdotseq}$ 57) and I-type (magnetite-series) based on the chemical data_ And they appear to have been fractionated at the order of Geodo granodiorite, Quartz monzonite porphyry and Imog granite. In terms of mineralogy, geochemistry and K/Ar biotite age, a rock suite of monzodiorite, quartz monzodiorite and quartz monzonite-granodiorite in the Geodo stock was fractionally differentiated from a magmatic body from its margin to inward.
문경(聞慶) 남부일대(南部一帶)에 분포(分布)하는 백악기(白惡紀) 화남암류(花南岩類)의 암석학(岩石學) 및 암석화학(岩石化學)
윤현수,김선억,Yun, Hyun Soo,Kim, Seon Eok 대한자원환경지질학회 1990 자원환경지질 Vol.23 No.3
The Cretaceous granites are widely distributed in the studied area, Mungyeong-Sangju, which belongs to the southwestern part of the Ogcheon Folded Belt. The granites are characterized by medium-coarse grained, spotted miaroles, partly flow textures of biotite, aplitic dykes and pegmatitic pockets with druse. From the major compositions, the granites indicate peraluminous, calc-alkaline, salic and late stage products of differentiation. In the view of normative compositions of Qz-Ab-Or and perthitic alkali feldspar, they were formed under 1-4kb and $426^{\circ}-456^{\circ}C$ in acqueous conditions. The K/ Ar biotite age shows $72{\pm}1$ Ma for this grante, corresponding to the igneous activity of the Bulgugsa Disturbance periods in the area. The above results represent that these granite bodies are differentiated from a single magma.
상동지역(上東地域) 선캠브리아 화강암류(花崗巖類)의 K-Ar 백운모(白雲母) 연령측정(年齡測定)
윤현수,Yun, Hyun Soo 대한자원환경지질학회 1991 자원환경지질 Vol.24 No.1
The studied Nonggeori and Naedeogri granites in the Sangdong area intruded into the Precambrian metasedimentary rocks of the Yulri Group. The Cambro-Ordovician Choseon Supergroup overlied unconformably upon the Yulri Group. Pegmatitic dykes injected into the Yulri Group and the granites, but not in the Choseon Supergroup. Field relationships suggest approximate ages of the intrusive rocks in the studied area belong to the Precambrian. Extremely pure concentrates of muscovites(40-80#) were obtained from the granites by conventional isodynamic magnetic separators. The contents of K and 40Ar in the muscovites show 8.60-8.78% and 98.52-99.11%, respectively. From the potassium contents of the muscovites and the approximate ages, the sample amounts for argon analyses are average of 0.00371gr. The K-Ar ages on the muscovites were revealed as Proterozoic ($1673{\pm}22{\sim}1802.5{\pm}17.5Ma$).