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허순도,이종익,김예동,이미정 한국해양과학기술원 2003 Ocean and Polar Research Vol.25 No.1
Inductively coupled plasma mass spectrometry (ICP-MS) is useful instrument for determining abundance of rare earth elements, due to very low detection limits and rapid data acquisition. In this article, two methods are used for decomposition of alkaline rocks; close vessel acid digestion and Na2CO3 fusion. The two analytical results show good agreements. Considering total dissolved solids and detection limits, the most adequate dilution factor is 5,000 times. Polyatomic ion interferences during analysis can give rise to inaccuracies. After correction from oxide and hydroxide interference, the analytical result show 20-30% decrease for Gd and Tm, 10-20% decrease for Tb and Er. In comparing the analytical results from KORDI with other institutes, most rare earth elements abundance show good agreements except Lu.
남극 킹조지섬 바톤반도의 열수변질작용에 관한 K-Ar 연대와 지구화학
허순도,이종익,황정,최문영,Hur, Soon-Do,Lee, Jong-Ik,Hwang, Jeong,Choe, Moon-Young 한국해양과학기술원 2001 Ocean and Polar Research Vol.23 No.1
K-Ar ages of the altered rocks from the Barton Peninsula are belows; altered tuffaceous andesite from southwestern part is 42 Ma, altered rocks contacted with quartz vein from southern part are 28 and 33 Ma, and advanced argillic altered andesite from northeastern part are 33 and 35 Ma. Those K-Ar ages are 10 My younger than granitic rocks of the Barton Peninsula. Hydothermal alteration of the Barton Peninsula was originated from mixing of magmatic water from parent magma of granitic rocks with meteoric water. The Al content in the hostrock is relatively constant during hydrothermal alteration, on the contrary the Mg content is in proportion to total alkali. The variation of total alkali and Mg contents in hydrothermal alteration indicates that those elements was washed out during hydrothermal alteration. The sequences of hydrothermal alteration of the Barton Peninsula is chloritization of amphiboles, sericitization of feldspars and kaolitization of sericite.
왕제 안티모니광상의 천열수 광화작용 : 광물 및 지구과학
허순도,황정,이찬희,최석원 公州大學校 基礎科學硏究所 1998 自然科學硏究 Vol.7 No.-
왕제 안티모니광상은 백악기 천부 관입암 복합채(역둔화강암체)의 영향을 받은 소규모의 탄산염암 교대형 천열수 광상이다. 광체는 풍촌석회암층의 층리를 교대하여 발달된 망토(manto) 또는 침치 또는 산점-망상세맥상으로 산출된다. 열수변질 및 광화작용을 받은 모암에는 Ag (0.1-0.6 ppm), As(34-241 ppm), Au(0.3-1.0 ppm), Cu(15-48 ppm), Pb(75-650 ppm), Sb(56->9,999 ppm) 및 Zn(331-370 ppm) 등이 부화되어 있다. 광화작용은 견운모 및 점토광물화 작용과 함께 단일 시기에 있었으며, 광석광물로는 자철석, 마그헤마이트, 황철석, 유비철석, 섬아연석, 황동석, 휘안석 등이 산출된다. 광화유체는 전반적으로 단순한 저염농도의 NaCh-H₂O 계의 것이었으나, CO₂- H₂O 계 유체의 일시적인 혼입이 있었다. 유체포유물의 균일화온도와 NaCl상당 염농도는 각각 164-246?Cdhk ??, ?? 값은 각각 6.2~8.6‰, 4.1~8.1‰alc -4.9~-9.1‰이었다. 따라서 광화작용의 초기에는 마그마 기원의 열수에 의한 광화작용이 진행되었으나, 후기로 가며 퇴적암 기원의 유체 또는 천수의 영향을 강하게 받은 것으로 보인다. 모암의 산소 및 탄소 안정동위원소비는 각각 12.1~20.0‰(SMOW)및 0.0~-2.8‰(PDB)이며, 광화대 및 열수변질대로 가면서 모두 가벼워지는 경향을 갖는다. 광상의 산출상태, 광석과 광물 및 생성조건으로 볼 때, 둔전-백전 지역에는 역둔화강암체의 중심에서 외각부로 가며 Au ->Au-Ag-> Au-Ag-Sb->Sb 광체순으로 수직적 및 수평적 대상분포가 인지된다. The Wangje antimony deposit, a small carbonate-hosted replacement deposit, was formed as a result of epithermal process that was associated with a shallow-seated Cretaceous Yeogdun granitoid intrusion. Mamo-to-chimney shaped orebodies were formed by the selective replacement of thin-bedded white grey limestone beds of the Cambrian Pungchon Limestone Formation. The ores occur as lens, patches and stringer-stockworks preferentially along the contact with coarse-grained calcite. Altered and/or mineralized host rock is enriched with Ag (0.1 to 0.6 ppm). As (34 to 241 ppm), Au (0.3 to 1,0 ppm), Cu (15 to 48 ppm), Pb (75 to 650 ppm). Sb (564 to >9,999 ppm) and Zn (331 to 370 ppm). The mineralization occurred within a single stage, consisting of ore minerals such as magnetite, magheinile, pyriic, arsenopyrite, sphalerite, chalcopyrite and Stibnite, and is associated with sericitic and argillic alteration. Fluid inclusion studies reveal that ore fluids were low saline with a simple NaCl-H2O system, but the temporary mixing with CO:-H;0 fluids occurred in the later period. Measured inclusion data indicate the homogenization temperatures and salinities of fluids are 164 to 246 C and 0.0 to 2.6 NaCI equivalent wt.%, respectively. The δ34SH2S values of hydrothennal fluid responsible for the deposition of sulfides such as pyrite and stibnile are calculated 10 be 6.2 to 8.6. The δ18H2o and δ13 Cco2 values for deposition of vein calcites range from 4.1 to 8.1. and -4.9 to 9.l. respectively. These stable isotope value are interpreted to indicate that ore fluids during the early period were derived from hydrothennal water of igneous origin, whereas the later fluids were highly influenced by mixing with oxidizing carbonatic and meteoric water. The oxygen and carbon isotope values of host rocks (sedimentary carbonates) are 12.1 to 20.0%,, vs. SMOW and 0.0 to -2.8%,, vs. PDB, respectively, and become progressively lighter toward the front of mineralized zone. Based upon the occurrence of orebodies, along with the mineralogy and depositional condition, a vertical and lateral orebody zoning as follows is recognized in the Dunjeon-Baegjeon mine area from the Yeogdun granitic complex toward the peripheral sites, Au→Au-Ag→Au-Ag-Sb→Sb ores.