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옥천대(沃川帶) 북동변(北東邊)에 분포(分布)하는 부산혼성편마암(婦山混成片麻岩)에 대(對)한 암석학적(岩石學的) 연구(硏究)
나기창,Na, Ki-Chang 대한자원환경지질학회 1987 자원환경지질 Vol.20 No.4
Busan migmatitic gneisses in the northeastern margin of the Ogcheon zone have been studied petrologically in order to clarify their origin. Petrochemical and mineralogical studies show that the gneisses are Precambrian basemental paragneisses and the rocks were migmatized more intensively than the Bagdalryeong gneisses which have been known to constitute the basemental gneisses of Ogcheon zone. K-Ar biotite isotopic ages are $150.79{\pm}3.37Ma$ in Busan migmatitic gneiss and $191{\pm}4.27Ma$ in Bagdalryeong gneisses. These ages seem to be isotopic homogenised ages. Progressive regional metamorphisms are predominent in the studied area showing greenschist facies, epidote amphibolite facies and amphibolite facies toward N-W direction.
서산층군(瑞山層群)의 층서(層序) 및 변성작용(變成作用)
나기창,김형식,이상헌,Na, Ki Chang,Kim, Hyung Shik,Lee, Sang Hun 대한자원환경지질학회 1982 자원환경지질 Vol.15 No.1
The Seosan Group in the Taean peninsular can be divided into Seosan formation and Daesan formation according to its metamorphism and stratigraphy. The Seosan formation is composed of iron bearing quartzite and schist which are strongly metamorphosed and migmatized about 2572 m.y.ago. The Daesan formation is composed mainly of quartzite and crystalline limestone. They were intruded by granite gneiss 2370m.y ago and metamorphosed two or three times before Jurassic Period. The Group is overlain by Taean formation which shows low grade metamorphism. Total three times metamorphic events can be recognized in these areas. First and second metamorphisms are predominent in amphibolite facies, the last metamolphism is mostly greenschist facies.
충주층군(忠州層群)과 서산층군(瑞山層群)의 비교연구(比較硏究)
나기창,김형식,이동진,이상헌,Na, Ki Chang,Kim, Hyung Shik,Lee, Dong Jin,Lee, Sang Hun 대한자원환경지질학회 1982 자원환경지질 Vol.15 No.4
The Chungju and Seosan Groups have been known usually as Precambrian formations in Korea. But their relative and absolute ages have been controvericial problem in relation with other geologic system such as so-called Ogcheon and Yeoncheon Systems in Korea. This study has mainly focused on the corelation of the Chungju Group with the Seosan Group in their stratigraphy, structure, metamorphism, and iron ore deposits. In the process of study, the auther surveyed and reclassified the Chungju and Seosan Groups and corelated with Gyeonggi and Ogch cheon metamorphic belts and got some new data. The Chungju iron-bearing formations showing transtitional relation with the Gyeonggi Gneiss Complex and the Jangamri Formation consisting mainly of pebble bearing calcarious phyllite, should be seperated from the Gyemyeongsan formation which is mainly composed of metavolcanic rocks. The Jangamri Formation and the coaly phyllite, which can be corelated respectively with the Hwaggangri Formation and Changri Formation in Ogcheon Group, are repeated in the Gyemyeonsan and Munjuri Formations with the overturned anticlinal folding(F1). So the Chungju Group which was defined as an indipendant geologic unit from the Ogcheon Group should be limited only on the Chungju iron Formation. The Seosan Group can be classified stratigraphically such as Seosan Formation consisting of iron-bearing quartzite and mica schist, Daesan Formation overlying unconformably on the Seosan Formation and Gyeonggi Gneiss Complex. Taean Formation overlying unconformably on the Daesan Formation should be seperated from Seosan Group. There are many similarity in the stratigrphy, structure, and metamorphic facies between Chungju and Seosan Groups exept the metavolcanic rocks in the Gyemyeongsan and Munjuri Formations and the pebble bearing calcareous phyllite in the Jangamri Formation. The two Groups were deformed with two kinds of differant stages, the first shows $N30^{\circ}-40^{\circ}E$ trend of fold axis, the second $N70^{\circ}-80^{\circ}W$ respectively. The Seosan Formation, which is the lowest formation in Seosan Group and bearing the iron formation, was metamorphosed at 2500 m. y. before. These age is similar with the metamorphic age of Gyeonggi metamorphic belt and with the age of Algoman and Kenoran Orogenies which devide the Precambrian into Archean and Proterozoic Era. So the Seosan Formation, which is included in some migmatitic rocks of Gyeonggi Gneiss Complex, is the oldest formation in Korea and can be corelated with the Anshan Group which bears the oldest iron formation in China. The metamorphic facies of the Precambrian metamorphism in Seosan area is simillar with that of Chungju area, showing high temperature-low pressure amphibolite facies which is corelated with the Gyeonggi metamorphic belt, the oldest metamorphic belt in Korea ($650^{\circ}-680^{\circ}C$, 3.2-4.4 Kb). The high temperature intermediate pressure amphibolite facies in Seosan area with the low temperature-intermediate presure greenschist facies of Taean formation is corelated with that of Ogcheon Group ($590^{\circ}-640^{\circ}$ C, 5.2-6.3 Kb). The Chungju and Seosan iron formations were deposited in Archean, showing geochemical composition of Precambrian iron formations. The Chungju iron formation was mainly formed by the chemical precipitation, on the other hand, the Seosan iron formation was formed by alternated action of chemical and detrital depositions.