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
제8권 제2호 (1987년 12월) 10건
1.
1987.12
구독 인증기관 무료, 개인회원 유료
The gravity anomaly of the southern part of the Gyeongsang basin and the adjacent sea is analyzed. According to the power spectrum analysis method, calculated the mean depth of the moho and the boundary between the sedimentary layer and the basements is 32㎞ and 61㎞ respectively. With these values, regional and residual anomalies of the gravity for each depth are calculated by the running average method and interpreted. By the sin X/X method, the crustal thickness and the depth of the boundary of the sedimentary layer in the southern part of the Gyeongsang basin turns out to vary from 34㎞ to 28㎞ and from 8.5㎞ to 0.5㎞ respectively.
4,300원
2.
1987.12
구독 인증기관 무료, 개인회원 유료
The aim of this study on analysis of curriculum of high school Earth Science is; 1) To investigate whether experiment and observation unit are properly organized. 2) To provide useful materials for reorganization of Earth Science curriculum in future. 3) To suggest that the curriculum be operated properly in the era of 2000s. This study reaches the conclusions which are as follows; 1) After classifying the course of experiment and observation, we have found it difficult to help the students inquiry learning for they are organized only to be explained by teacher on the purpose of passing entrance exam. 2) It is difficult to help students make an experiment because of laboratory's lack. So it is necessary for the education authority to require the situation and to support its system actively. 3) Lack of experimental equipments and classroom schedule for experiment make it difficult to make an experiment in most schools(For example 89.1 % of the whole school lack implement, 52.7% lack prepared hours, 73.6% perform less than 5 hours a week). 4) It is not proper to divide the curriculum into Earth Science(I) and Earth Science(II). Most of teachers tell that the teaching material is somewhat difficult for the students to understand and the quantity of those is too much(80.9%). 5) Those who study liberal course are inclined to choose Biology(82.7%) and those who study natural science, Chemistry(76.4%) or Biology(79.1). In most high school they are forced to run curriculum unfairly on account of this present condition.
4,200원
3.
1987.12
구독 인증기관 무료, 개인회원 유료
전의 금광상은 백악기 화강암류가 관입하고 있는 원생대 흑운모 편마암내의 단층 파쇄대를 충진한 수개조의 합금 열수 맥상광체로 은과 연, 아연, 동을 수반한다. 열수작용은 구조운동에 수반되어 시기적으로 2회에 걸쳐 진행되었으며, 초기 약 370℃의 고온에서 후기의 180℃에 이르는 제 Ⅰ, Ⅱ 광화시기에서 각각 상이한 광화 열수계에 의하여 석영, 유화물이 침전되었다. 공생광물의 유체포유물 및 유황 안정동위원소 연구에 의하면 광석광물은 1-14wt % NaCl 상당 염도를 갖는 유체로부터 300℃-180℃에서 침전되었는데, 희석작용이 냉각과 함께 금침전에 중요한 역할을 하였음이 추정된다. Ⅰ, Ⅱ 광화작용 시기에서의 압력은 약 100기압이고 광화작용의 심도는 500-11,250m 이었다. 합금 석영맥에 산출되는 유화광물의 유황 및 연 동위원소 값은 단일 화성기원임이 뚜렷하고, 광체내의 시·공간적 변화는 보여주지 않는다. 광화유체내에는 환원상의 유황이 대부분이었다.
4,000원
4.
1987.12
구독 인증기관 무료, 개인회원 유료
보은군 회남면 조곡리에는 옥천계 누층군내에 감람암의 노두가 발견되며 이 암석의 밀도는 2.9∼3.1 g/㎤로서 주변암석 보다 0.3g/㎤ 이상 크기 때문에 중력 탐사에 의한 감람암의 지하연장 규모를 추정할 만 하다. 본 지역과 주변지역에서 정밀측정을 실시한 결과 중력 이상치는 서측에서 18mgal, 동측에서는 8mgal 정도로 지역적 경향을 보이며 이로부터 분리한 국지적 중력이상은 감람암 노두지역 부근에서 4,3mgal 정도이다. 이를 분석 연구하여 감람암체가 약 3㎞ 이내의 뿌리를 갖고 있으며 지하로 들어갈수록 서측으로 경사되어 있음을 알 수 있었다. 따라서 감람암체는 현 위치에서 맨틀로부터 상승 분출했다기 보다 이미 분출된 후에 지각변동을 받아 이동된 듯하다.
4,300원
5.
1987.12
구독 인증기관 무료, 개인회원 유료
The physical properties of sedimentary rocks in the coal fields were studied. Sandstones and shales are major samples among the core samples from Samchuck and Boeun coal fields. The measured properties were seismic velocities (P and S-wave), electrical resistivity, density and porosity. The relationships between physical properties were analyzed by using the cross plots. Summarized results are as follows : 1. Compressional wave velocity is approximately linearly related to shear wave velocity and the velocity ratio Vp/Vs of shales has slightly larger value than that of sandstone. And with increasing Vp, the velocity ratio Vp/Vs decreases because the effect of porosity and clay content on Vs is larger than on Vp. 2. In the case of sandstones, as porosity increases, P-wave velocity decreases slowly, but effect on the density is not apparent. In the case of shales, as porosity increases, both P-wave velocity and density decrease. 3. The values and variation range of density of sandstones are relatively small as compared to those of shales. But the range of elastic wave velocities of both rocks are appeared to be similar. 4. Seismic velocity is power-functionally related to electrical resistivity, and the value of the power is appeared to be larger for sandstones than for shales. 5. Because samples from Boeun field are slightly metamorphosed, the values of electrical resistivity are larger than those of samples from Samchuk field.
4,000원
6.
1987.12
구독 인증기관 무료, 개인회원 유료
The principal consisting rocks of study area are Precambrian metasedimentary bedrocks, Cambro-ordovician sedimentary rocks and Samhwa granite which have intruded these metasedimentary and sedimentary rocks. The reddish K-feldspar bearing Samhwa granite presettts miarolitic texture and graphic intergrowth between quartz and K-feldspar. The granite, homogeneous in chemical composition of major elements, belongs to Calc-alkali rocks of subalkali series. According to AMF diagram, the granite was crystallized at the latest stage of the differentiation of magma. The Samhwa granite belongs to I-type granitoids and magnetite-series granitoids. Especially, this granite is thought to be crystallized in the epicrust with high oxygen fugacity. The Samhwa granite has similar characteristics to masanite of cretaceous granitic rocks of Gyeongsang basin in the petrological and petrochemical properties. The biotite age of the granite by K-Ar age dating is 50.1±1.5. Finally, contact metamorphic zone of limestone by granite intrusion contains distinct minerals such as diopside, brucite, tremolite and muscovite, which indicate low temperature metamorphic grade.
4,500원
7.
1987.12
구독 인증기관 무료, 개인회원 유료
Cretaceous plutonic rocks distributed in Yuga and Seongsan.myeon are of quartz monzodiorite,granodiorite and monzogranite(granite B) in rock types. The modal composition changes systematically and each plutons are divided into the two rock types convenienly, ie. intermediate and acidic rock types:The intermediate rock is composed of quartz monzodiorite mainly and granodiorite, whereas the acidic rock is composed of monzogranite mainly and quartz monzonite. Zirocons are prominently included in plagioclase of the rock forming minerals in the intermediate rock, whereas in the acidic rock, in hornblende and biotite of the rock forming minerals prominently, The amounts of the included zircons are related to the relative amounts of plagioclase or hornblende and biotite in the two rock types. In the ratio of the included zircons of the main rock forming minerals, those of plagioclase are narrowly constant, whereas those of hornblende and biotite are broadly change in the two rock types and the latters in the acidic rock are higher than those in the intermediate rock. The size of zircon grains gradationally decrease from the intermediate rock parts to the acidic rock. From the frequency distribution of lenghth and breadth, those of the intermediate rock are bimodal or polymodal, and those of the acidic rock are unimodal shape. From these fact, it is suggested that the two rock types are comagmatic origin, but zircon concentrates of each rock type may have been crystallized under some different magmatic environment in the physico-chemical condition.
4,500원
8.
1987.12
구독 인증기관 무료, 개인회원 유료
황해와 동지나해의 해수순환에 관한 수치모의 실험을 실시하였다. 해저지형을 포함한 1층 모형 바다위에 여덟방위의 바람을 차례로 불려 나타나는 해상순환을 비교하였다. 바람의 영향만을 보기 위하여 해류가 존재하지 않는 폐쇄된 바다 위에 바람을 불린 결과 황해의 순환은 풍향에 따라 크게 달라짐을 볼 수 있었다. 대체로 남서풍 성분이 탁월해지면 시계방향의 순환이 우세해지고 북동풍 성분의 풍향하에서는 반시계 방향의 순환이 우세해짐을 볼 수 있다. 그러나 동지나해의 대륙사면을 따라 쿠로시오 해류를 포함시키면 남쪽 동지나해 부근에서는 풍향에 관계없이 시계방향의 순환이 우세해지고 북쪽 황해내부에서는 풍향에 의한 영향이 감소함을 볼 수 있다.
4,000원
9.
1987.12
구독 인증기관 무료, 개인회원 유료
Three galaxies, NGC 0891(Sb),NGC 3359(SBc) and NGC 7640(SBc) have been taken to figure out the radio structural differences of spiral and barred spiral galaxies. Those galaxies have been observed in 21 cm neutral hydrogen emission line with 300 feet N.R.A.O, radio telescone(Rots, 1979). As Rots' observational line profiles have low angular resoulution, we could not distinguish the radix structural differences of those galaxies: Instead, the neutral hydrogen gases of each galaxy have been shown to tie widely distributed and the HI extents are much larger than the photographically shown ones. Furthermore, as peak column density regions coincide with the central regions of the galaxies, the large extensive radio structures may reveal the neutral gas distributions of the halo parts. The neutral hydrogen mass of each galaxy has been derived from the column density distributions. The line profiles of each galaxy help to obtain the velocity curves, from which the total kinematic mass can be calculated.
4,200원
10.
1987.12
구독 인증기관·개인회원 무료
