간행물
한국지구과학회지 KCI 등재 The Journal of The Korean Earth Science Society
- 발행기관 한국지구과학회
- 자료유형 학술지
- 간기 격월간
- ISSN 1225-6692 (Print)2287-4518 (Online)
- 수록기간 1979 ~ 2024
- 주제분류 자연과학 > 지구과학 자연과학 분류의 다른 간행물
- 십진분류KDC 450DDC 550
권호리스트/논문검색
제13권 제2호 (1992년 6월) 10건
1.
1992.06
구독 인증기관 무료, 개인회원 유료
This paper was made for the purpose of research for direction on earth science subject matter of high school in Korea. For this purpose, we 1) reviewed the essence of science and goals and contents of science education, 2) reviewed the change of education of earth science subject matter, 3) investigated earth science teacher's opinion by questionnaire. The results were as follows: 1. Earth science subject matter must provide to students scientific process and knowledge - Process : to promote student's concerns for an interest in nature surrounding them, to help students develop and method in solving problems and its application for problem solving, recognition of variables of scientific method, to promote fundamental experiment and skills for scientific inquiry, etc. - Knowledge : provide systematic knowledge than simple rote, to help students understand concepts of recent scientific knowledge, contains STS, etc. 2. Earth science education must consider educational philosophy and educational psychology education of scientific literacy, partial professional education, conformity of development stage, sequence between school levels, attitudes to adaptation of scientific knowledge, method, skills and problem solving toward future positive attitudes to science, moral sense of science, minimum essense and difference of lines, open of upper limit, understanding the specific character of earth science, scientific knowledge development continuously, relationships of other subject matter, etc.
4,600원
2.
1992.06
구독 인증기관 무료, 개인회원 유료
The Bug-ap orebody in the Shinyemi lead, zinc and molybdenum deposits is emplaced in altered felsite at the 435mL on east district of the Shinyemi mine. It is consist of skarn type and massive type ore. Garnet is major skarn minerals, composition ranges of garnet are An._(25-.62) Gr._(35-.71), belongs to grandite series. Garnet under the microscopic observation has isotropic features on central part and anisotropic features on rim, this fact tells that formation temperature ranges of garnet are very wide. Sphalerite, galena and molybdenite are main ore minerals associated with pyrrhotite, chalcopyrite, pyrite, arsenopyrite, tetrahedrite, electrum, sheelite and marcasite. By the fluid inclusion study, ore minerals were deposited at temperature between 315 and 350℃ from fluids with salinities of 6.4 to 10.4 wt.% equivalent NaCl. Sulfur fugacity inferred from data of mineral assemblage and FeS mole % of sphalerite ranges from 10^(-9) to 10^(-10) bars. Lithostatic pressure estimated from fluid inclusion study ranges from 460 to 320 bars during mineralization.
4,000원
3.
1992.06
구독 인증기관 무료, 개인회원 유료
Geological and Terrain Analysis of Choogaryeong Rift Valley in Cheolwon Area : Military Applications
The purpose of this study is to analyse the geological and terrain factors of the part of Choogaryeong Rift Valley between Yeoncheon and Cheolwon. The results are: (1) The geology is composed of three kinds of rocks: Yeoncheon System, Jurassic volcanic rocks and Quaternary Jeongok basalt. (2) It seems to be that there are basaltic layers of 7-8m thickness below the rift valley by the analysis of resistivity survey. (3) The topography of the region could be divided into two characteristic parts: the rift valley and surrounding mountainous area. (4) The site of the area is important because it is the boundary where two kinds of different geologic factors contact. (5) The situation of the area is important because of its central location between Seoul and Wonsan.
4,000원
4.
1992.06
구독 인증기관 무료, 개인회원 유료
In the Sosan reclamation land constructed by Hyundai Co,1984, the basic soil test and electric resistivity survey are carried out for the soft grounds around Tee and Kkot islands composed of tuffbreccia, and granite, respectively. The soil of soft grounds are classified as sandy clay(SC) and sandy silt(SM) in the Tee island, and as sandy silt(SM) in Kkot island according to the unified standard classification system. The vertical distribution of the electric resistivity is identified 4 layes with the value 30∼224 Ωm, 3∼59 Ωm, 0.15∼1.5 Ωm, 110∼1280 Ωm(Tee island:112∼122 Ωm, Kkot island:1260∼1283 Ωm), and the layers are interpreted as aeration layer, freshwater saturated layer, seaweater saturated layer, weathered layer, and basement rock respectively. The electric resistivity value decreases with increase of salinity, and pore water and clay mineral content.
4,200원
5.
1992.06
구독 인증기관 무료, 개인회원 유료
In the Sosan reclamation land constructed by Hyundai Co,1984, the basic soil test and electric resistivity survey are carried out for the soft grounds around Tee and Kkot islands composed of tuffbreccia, and granite, respectively. The soil of soft grounds are classified as sandy clay(SC) and sandy silt(SM) in the Tee island, and as sandy silt(SM) in Kkot island according to the unified standard classification system. The vertical distribution of the electric resistivity is identified 4 layes with the value 30∼224 Ωm, 3∼59 Ωm, 0.15∼1.5 Ωm, 110∼1280 Ωm(Tee island:112∼122 Ωm, Kkot island:1260∼1283 Ωm), and the layers are interpreted as aeration layer, freshwater saturated layer, seaweater saturated layer, weathered layer, and basement rock respectively. The electric resistivity value decreases with increase of salinity, and pore water and clay mineral content.
5,500원
6.
1992.06
구독 인증기관 무료, 개인회원 유료
The granitic rocks in the southern part of the Kyeongsang basin, Korea, are divided into seven masses based on the petrographical features. They are generally characterized by shallow-depth intrusions. The chemical compositions of amphibole and biotite from the granitic rocks show systematic variations in Fe/(Fe+Mg) ratios as well as Mn and F contents. Hornblende geobarometer indicates low pressure condition (less than 2.3 kbar) at the time of final crystallization of hornblende crystals. The composition of biotite indicates that oxygen fugacity has been almost buffered during crystallization regardless of rock types. The oxygen fugacity is presumably close to the value of Ni-NiO buffer. From the Fe-Ti oxide geothermometry, it seems likely that most of the Fe-Ti oxides have been re-equilibrated during cooling and have suffered oxidation under subsolidus condition.
6,100원
7.
1992.06
구독 인증기관 무료, 개인회원 유료
Tertiary volcanic activity in the Fildes Peninsula can be divided into three stages (I, II, III) of magmatism. Evolutionary process of each stage was examined from the geochemical characteristics. For stage I, olivine, orthopyroxene and clinopyroxene of low Fe/Mg ratio as well as Ca-plagioclase begin to crystallize and fractionate. Stage II magma, which is more differentiated than stage I magma, shows the fractionation of Ca-plagioclase and olivine and orthopyroxene of high Fe/Mg ratio. Stage III magma, which is slightly more differentiated than stage I magma but less than stage II magma, intruded into the area when stage II magmatism was weakened. The volcanic rocks on the Fildes Peninsula show, as a whole, tholeiitic natures. From the previous studies on Sr isotopic ratio, the origin of the volcanic magma in the area was assumed to be upper mantle. Accordingly, the volcanic rocks in the area were originated from tholeiitic magma which generated by the partial melting of upper mantle under island-arc environment.
4,300원
8.
1992.06
구독 인증기관 무료, 개인회원 유료
In this study the presence of pulse in formation of marginal basins through calculation of production rates based on the age of 22 marginal basins distributed in the western Pacific is revealed. The peaks of their productions appear approximately at 0 Ma, 30 Ma and 60 Ma, with the interval of about 30 my. Production peak appears to be the largest near 30 Ma (45 × 10⁴ ㎢). From the fluctuation of production rates, continuous production of marginal basins after 0 Ma (present-day) is inferred, and it is very likely that a production peak which is considerably higher than 30 Ma peak would appear in the future. Such upward inclination of production rates of marginal basins is vividly contrasting to downward decline of those of normal oceans. During the period of declining activities between 10 Ma and 15 Ma no activities of marginal basins are observed. When the marginal basins are classified into back-arc and non back-arc basins on the basis of their evolutionary processes, it is observed that back-arc basins appear to have cyclic production peaks approximately at 0 Ma, 20 Ma and 45 Ma, with the interval of about 20 my. The present-day back-arc basins appear to he most active in their productions. The phenomenon of fluctuations in the quantity of production upto now shows a upward climbing trend. The periods with less activity of back-arc basins appear to have been active in arc volcanism. It is considered that the formation of marginal basins and arc volcanism have been alternately active with time. Non back-arc basins seem to have been formed concentrically at about 25 Ma - 35 Ma and 55 Ma - 80 Ma. In the back-arc basins distributed near northwestern (NW) and southwestern (SW) Pacific around equator, it is revealed that production peak has been moved from SW (55 - 80 Ma) through NW (15 - 55 Ma) to SW (0 - 10 Ma) Pacific in time and space. It is supposed that the periodic formation of marginal basins with time is associated with spatial cycles.
4,600원
9.
1992.06
구독 인증기관 무료, 개인회원 유료
The Cretaceous granitoids related to base metal mineralization in the studied area consist of hornblende - biotite granite, leucocratic granite and micrographic granite. The major - and trace element data from granitoids, when plotted on the Hacker diagram, average contents of Al₂O₃, CaO, Mg0 and Fe₂O₃ decrease while SiO₂ increases in granitoids from Dolsan toward Namhae and Kwangyang areas. Average content of Rb is higher in Kwangyang area while Ba and Sr decrease in granitoids from Dolsan toward Namhae and Kwangyang, and as shown in triangular diagram of RbBa-Sr, which indicates gradual differentiation of granitic magma from Dolsan toward Namhae and Kwangyang. And, studies of major element variation, calc-alkaline index(61.5) and AFM diagram of granitoids indicates that granitoids have been crystallized from a calc-alkaline magma generated by partial melting of the subducted Pacific Oceanic Crust(or Kula plate) at the compressional plate margin, that is, the volcanic arc. Na₂O/K₂O ratio and magnetic susceptibility of granitoids indicate that they belong to I-type and magnetite series. As shown in atoms against pressure diagram, variation to the number of cations Al^(4+) Al^(6+), (Al+Fe^(3+)^(6+), Si, (Mg+Fe^(2+)), and A-site (Na+K) in amphiboles are shown as functions of estimated crystallization pressure, which the amphibole in granitoids crystallized in the pressure range of 1.8 - 3.0 kbar. According to the two-feldspar geothermometry on granitoids of Kwangyang, Dolsan and Namhae areas, the temperature of cessation of exsolution in perthitic alkali feldspars are 476 - 607℃, 489 - 640℃ and 465 - 629℃, respectively, at assumed pressure of 3 kbar, which may be the result of rapid crystallization in the shallow crustal level(5 - 7.5 ㎞).
5,700원
10.
1992.06
구독 인증기관 무료, 개인회원 유료
Uyeda and Kanamori (1979) classified subduction zones into two modes - Mariana type and Chilean type. Many features such as back-arc basin, stress field, dip angle of Benioff-Wadati zone, thrust earthquake and accretionary prism are different in both types. Kinds of stress field as well as the dip angle of Benioff-Wadati zone are important factors controlling the spatial distribution of volcanic activity. Mariana type represents tensional field and high dip angle, whereas Chilean type does compressional and gentle dip. From the relationship between the dip angle of Benioff-Wadati zone and volcanic spacing, it is recognized that as the dip steepens the linear density of volcanoes increases but the width of them decreases. As the dip angle increases, the stress field becomes more tensional and volcanic magmas rise more actively, Also, the dip angle has a close relation to the dip of partial melting zone located along the subducting slab. As the dip increases, the width of partial melting zone decreases and subsequently the spacing of volcanoes decreases. Volcanic rocks in the subduction zone represent geochemical differences due to the mode of subduction and degree of arc maturity. In continental arc and mature island arc (Chilean type) the volcanic rocks show the geochemical variation from tholeiitic to calc-alkaline and finally to alkaline, whereas in immature arc without continental crust (Mariana type) they generally show tholeiitic affinities. However, in addition to the inter-type differences in tectonic environments and geochemical natures, the infra-type ones are also prominent. It seems like that the change of evolutionary step in each type has caused the intra-type differences.
4,000원
