한국 (韓國) 영랑호 (永郞湖) 퇴적물의 지구화학적 수단에 의한 고기후 (古氣候) 변천에 관한 연구

중정신지 (中井信之),홍사욱 ( Nakai Nobuyuki,Sa Uk Hong ) 한국하천호수학회 1982 생태와 환경 Vol.15 No.3·4

The climatic fluctuations of δ^13C values and contents of sulfide minerals which are mainly due to the change of sea level were estimated in the braclish lake sediments. The results of this study suggested that the climatic optimum (Jyomon transgrssion) and wu¨rm glacial age might be overlaped geochronologically. As summarized in Table 3, the both methods using the δ^13C value and sulfide-sufur revealed that the climatic optimum including warm, cold, cool periods were at the same depth and age except that only sulfide was identified in warm period at 9-10m (corresponding to Allerod time). Therefore, our next research problem is whether the composition-of sulfide-sulfer isotopes ^34S/^33S could be utilized as a appropria indicator for a elimatie or not.

한강수계의 (漢江水系) 주요용존화학성분에 (主要溶存化學成分) 관한 조사

홍사욱,중정신지 (中井信之),삼전촌서좌무 (三田村緖佐武) ( Sa Uk Hong,Nobuyuki Nakai Osamu Mitamura ) 한국하천호수학회 1982 생태와 환경 Vol.15 No.3·4

In this study the changes of the dissolved chemcal components in the water of Han River were investigated. Total 32 sampling sites were choosen from the upper part of South Han River and North Han River to the lower dart of main Han River near Kimpo Bridge. Sampling was done 3 times on November, 1980 and during May to October, 1981, respectively. Because of the mine waste and Lime stone zone the water from the upper part of South Han River showed high value of T-hardness, Ca-hardness, SO₄ and pH. Furthermore, the several tributries of this arears where recieved the mine waste water showed even higher T-hardness, Ca-hardness and pH values. The values of T-hardness, Ca-hardness, SO₄ and pH of the North Han River were relatively lower than that of the South Han River, however, the both values of T-hardness and pH of Hwacheon and Chuncheon reservoir showed the tendency toward increasing in comparison to the other sites of North Han River. On the other hand, PO₄-P and N-compound were both detected in a very small amount in the water from South and North Han HanRiver while the DO was saturated in the water. From this results, it can be suggested that South and North Han River are not polluted yet and reasonably clean until now. However, from the vicinity of the 3rd Han RiverBridge to the Kimpo Bridge area of the main Han River DO value of water was significantly decreased while the value of Cl, PO₄-P and N-compound were markedly increased, suggesting that the water of this area was severely polluted because of the influence of urban waste water.

한강에 (漢江) 있어서 주요 용존화학성분의 (溶存化學成分) 지구화학적 (地球化學的) 연구

수곡의언 (水谷義彦),중정신지 (中井信之),홍사욱 ( Yoshihiko Mizutani,Nobuyuki Nakai,Sa Uk Hong ) 한국하천호수학회 1982 생태와 환경 Vol.15 No.1·2

The water quality of South Han River was reaveled relatively higher concentration of Ca-HCO₃-SO₄ type. The Source of Ca and HCO₃ content may have probably originated to the dissolution of lime stone which was widely distributed upper parts of South Han River area. And the content of dissolved sulfate seem to be due to the contribution of mine waste water. On the contrary the water quality of North Han River are shown lower concentration of Ca-Na-HCO₃-SO₄-Cl type, for the major parts of upper North Han River area were composed of the hardly weathering granite zone. The changes of water quality was recognized obviously at the site in the near Seoul City along to down flow of the Han River owing to the pollution by influence of waste water from this city. From the ratio of isotope in this water it became clear that the heavy isotope such as D and ^15O was concentrated by the evaporation from surface of those artificial Dam which constructed in this Han River. As a matter this phenomena also suggested that the other chemical component in this river water concentrated as to the heavy metals. For furture reach problem it would pointed out that the explanation of supplying source for the DO and SO₄ and the assessment for the contribution of rainwater and waste water proceed by using the isotope composition as a indicator. And it is of common knowledge that the water quality of Han River was changed markedly in accordance with seasonal variation. So that it is very important to make investigation of those primary factor for examination of the environmental changes in river basin.

Sulfur isotope composition and isotopic temperatures of the Shinyemi lead and zinc ore deposits, western Taebaegsan metallogenic belt, Korea

Kyu Han Kim(金奎漢),Nobuyuki Nakai(中井信之) 대한자원환경지질학회 1982 자원환경지질 Vol.15 No.3

新禮美鑛床은 太白山鑛化帶西部에 위치하여 Cambro-Ordovician紀의 莫洞石灰岩과 新禮美花崗閃綠岩(60m.y.)의 접촉부에 발달하는 接觸交代鑛床이다. 鑛石鑛物은 閃亞鉛石, 方鉛石, 黃銅石, 輝水鉛石, 磁鐵石이며 자류철석, 황철석, 유비철석, 백철석, 회중석도 소량 수반된다. 스카른鑛物은 石榴石, 輝石으로 되어 있고 소량의 綠簾石, tremolite, phlogopite도 포함된다. 鑛床은 産出狀態, 鑛物의 成分, 硫黃同位元素成分에 의해 西部層狀스카른鑛體와 東部 pipe 및 脈狀鑛體로 나누어진다. 71個의 硫化鑛物의 硫黃同位元素値(δ³⁴S)는 -10.1~+5.0‰이며 西部層狀鑛體(旱期鑛化)의 硫化鑛物의 δ³⁴S는 -10.1~+2.5‰, 西部 pipe狀 및 脈狀鑛體(後期鑛化)의 것은 +2.7~5.0‰이다. 이같은 東西部의 差異는 δ³⁴S값이 광물의 種類에 關係없이 鑛化作用의 時期와 産出狀態 및 鑛化溶液의 침전환경등의 차에 의한 것으로 해석된다. 또 이 δ³⁴S 범위는 국내의 火成起源의 硫化鑛床産 200여개 硫花鑛物의 δ³⁴범위 +2~+7.0‰과 거의 같은 범위에 들어간다. 閃亞鉛石一方鉛石同位元素地質溫度計에 의하면 東部의 新鑛體 B의 생성온도는 400~540℃이며 이는 스카른광물의 광물조합에서 얻은 결과와도 비교적 잘 일치한다. 여러 資料에서 검토 해본 결과 新禮美鑛床은 전형적인 接觸交代鑛床이며 熱水鑛液의 起源은 新禮美花崗閃綠岩에 연관되어 있는 것으로 해석된다. Sulfur isotope compositions (δ³⁴S) of seventy one sulfide minerals from the Shinyemi ore deposits were determined to range from -10.1 to +5.0‰ with a mean value of +2.1‰. These values are roughly comparable to those of various hydrothermal ore deposits in Korea, about +2.0 to +7.0‰, in δ³⁴S, suggesting that they are to be same in source of sulfur. The Shinyemi deposits are grouped into two types; the western bedded skarn orebodies and the eastern small pipes and veins. The δ³⁴S values of sulfide minerals from the bedded orebodies (early mineralization) are ranging from -10.1 to +2.5‰, which is relatively wide in range, whereas those of the pipes and veins (later mineralization) have a narrow range of δ³⁴S values, +2.7 to +5.0‰, regardless of the kind of sulfide minerals. Isotopic temperature obtained from the sphalerite-galena mineral pairs of the New B orebody appeared to be about 400 to 540℃ are reasonably good agreement with the comparable data of skarn mineral assemblages. It is concluded that the west orebodies were formed in earlier stage at higher temperatures than the east orebodies formed later at lower temperatures. Judging from the various data from the present study, the Shinyemi deposits can be defined as a typical contact metasomatic deposit. The source of sulfur in the hydrothermal solutions is considered to be comagmatic with the Shinyemi granodiorite.

A mineralogical study of the skarn minerals from the Shinyemi lead-zinc ore deposits, Korea

Kyu Han Kim(金奎漢),Nobuyuki Nakai,(中井信之)Ok Joon Kim(金玉準) 대한자원환경지질학회 1981 자원환경지질 Vol.14 No.4

新禮業鑛床의 스카른 鑛物은 1) 石榴石-輝石一金雲母-硅灰石 組合, 2) 石榴石-輝石 組合, 3) 石榴石-綠廉石 組合으로 區分된다. 이들 鑛物組合은 鑛石鑛物의 産出狀態, 鑛石鑛物의 種類 그리고 鑛化作用의 時期와 밀접한 關係가 있다. 石榴石結晶의 分析에 의하면 石榴石結晶의 累帶構造는 結晶의 成長時에 平衡條件의 變化에 기인한 化學的 累帶構造(chemical compositional zoning)이다. 그리고 鑛床의 生成環境과 關係火成岩의 位置를 스카른鑛物의 産出狀態와 스카른 鑛物中 石榴石의 化學成分의 검토에 의해 추정해 보았다. Skarn silicates from the Shinyemi lead-zinc ore deposits can be distinguished as following three mineral assemblages: 1) garnet-pyroxene-phlogopite-wollastonite assemblages, 2) garnet-pyroxene assemblages, 3) garnet-epidote assemblages The assemblages are considered to be related with occurrences and kindes of ore minerals, and stage of mineralization in the deposits. Microprobe analyses of some garnets from the deposits show strong chemical zoning which is due to the changing equilibrium condition during growth of garnet crystal. Depositional condition of ore deposits and place of the ore-related, igneous rock are discussed in the light of chemical composition of garnet and occurence of skarns in the Shinyemi.

Isotopic Compositions of Precipitations and Groundwaters in South Korea

金奎漢(Kyu Han Kim),中井信之(Nobuyuki Nakai) 대한지질학회 1988 지질학회지 Vol.24 No.1

Sulfur isotope composition and isotopic temperatures of some base metal ore deposits, South Korea

金奎漢(Kyu Han Kim),中井信之(NobuyuKi Nakai) 대한지질학회 1980 지질학회지 Vol.16 No.2