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
제12권 제3호 (1991년 9월) 10건
1.
1991.09
구독 인증기관 무료, 개인회원 유료
Marohae Bay in the South Coast of Korea, which is composed of complex coasts and many islands of various size, was surveyed to examine the source and transportation of sediments. The surface sediments with consist of gravelly sand, silt, sightly gravelly muddy silt, sand, clayey sand could be divided into three fades a and, silt and gravel facies. Micro-organisms of warm water included Dictyocha oceanica of nannoplankton were occurred in surface sediments. On the basis of study results, it is assumed that the study area shows the characteristic depositional environment which fine sediments could be transported from low latitude by Kuroshio current.
4,000원
2.
1991.09
구독 인증기관 무료, 개인회원 유료
The textural characteristics, the total suspended matter and the coarse fraction components of the surface sediments of the marine environment on the Cheju Strait are described and the distribution pattern of clay mineral discussed. The sediments are subdivied into ten textural classes; namely sand, slightly gravilly muddy sand, muddy sand, sandy clay, slightly gravelly sandy mud, mud and clay. the coarse sediments are distributed in the central and southeastern parts of the Cheju Strait which are bathymetric highs, whereas the fine-grained deposits are mainly distributed in the northeastern region, and the small scale of coarse and fine-grained mixed sediments are distributed in the western part of the study area. The high concentration of the total suspended matter in the study area gradually increase toward the northeastern nearshore area. The light minerals such as K-feldspar show a high content toward the northern region, which is related to the weathering of granites and metamorphic rooks on the adjacent lands, but the Na-Ca feldspars are relatively high near the northern part off Cheju Island. The illite is the most widespread clay mineral and the high concentrations of illite gradually increase toward the southern offshore. It is presumed that they are largely transported by the Kuroshio Current from the East China Sea such as Yellow Sea Warm Current and Tsushima Warm Current. Smectite is highly concentrated in the central part and arround off the Cheju Island it may have been partly derived from the central Yellow Sea by the local ocean current and the result of supplies of smectite altered from volcanic materials distributed in the Cheju Island. Therelative abundance of kaolinite shows a high in the northern nearshore area rather than in other regions, which are probably the results of supply from the southwestern Korea Rivers such as the Youngsan and Seomjin River. Chlorite shows partly similar distribution trend to that of kaolinite. This is related to the weathering of metamorphic rocks on adjacent lands. As to the controlling factors of the distribution pattern of clay minerals on the Cheju Strait, it is concluded that not only regional on-land geology but also local turbid plume and major ocean circulation are important.
5,700원
3.
1991.09
구독 인증기관 무료, 개인회원 유료
The tidal current observation was carried out to investigate the characteristics of the circulation and diffusion in the vicinity of Kunsan harbor on March 1415, April 1∼2, and 13∼14, 1988. By harmonic analysis, the semidiurnal tidal current of more the amplitude of vibration was prevailed and its rotary direction was anti-clockwise in this harbor. Apparently constant current which is generated by out flow of Geum river was found to flow from Kunsan inner harbor to Janghang with the speed of about 30㎝/sec. It can be easily considered that deposition of much sand and mud which come from Geum river in Kunsan inner harbor and erosion in Janghang harbor will be occurred respectively. Autocorrelation and diffusion coefficient of each components was calculated to study the some characteristics of diffusion. Correlogram of the east-west component current was regular and nearly the same period as semidiurnal current. But it appeared irregular and considerably small value in the north-south component correlogram. Diffusion coefficient was 4 order in X-axis and 2∼3 order in Y axis in each study station.
4,000원
4.
1991.09
구독 인증기관 무료, 개인회원 유료
Water samples were collected every one hour during July 23-24 1987 from the Minami-Asakawa River and sewage effluents into it. Mearldaily loading and budgets of some bioelements, such as carbon, nitrongen and phosphorrs, were estimated. the fluxeds of suspended matter, organic carbons and ammoioum appeared to remove by self-purification pocesses. On the other hand, those of nitrate, nitrite and chlorophyll a, which were considered to be produced in situ, increased with the river flow. From these results, it was suggested that the river is not only the place for transportation of bioelements but also that for their metabolism.
4,200원
5.
1991.09
구독 인증기관 무료, 개인회원 유료
Fog in Taechon which is located in the west coast of Korea is advection fog made by marine atmosphere which is higher than the temperature of sea water and cooled while moving toward land with wind. Huwevcr. the annual mean number of tog days is 15.1, obviously Icss than those of Susan, Kunsan and similar coastal cities. The number of fog occurrence days in April and May increases twice as many as that of the months from November to March. From August it decreases to half as many as that of the months from April to May and then maintains such an extent. So the phenomenon is different from other areas. 1 he characteristics of fog in Taechon arc due to little difference between sea surface temperature and marine air temperature and geographical characteristics of Taechon area.
4,500원
6.
1991.09
구독 인증기관 무료, 개인회원 유료
Many granitic masses are distributed in southeastern part of Gyeongsang basin in Korean peninsula by plutonism. The granitoids in Gyeongsang basin can be classified ~s Cretaceous Chindong granitoid, upper Cretaceous Bulgugsa granitoid, and upper Cretaceous to early Tertiary Masanite. Chindong granitold consists of quartz diorite, tonalite, and granodiorite. Bulgugsa granitoid is classified as hornblendegranite, biotite,granite and porphyritic granite. Masaaite consists of hornblende granite type and biotite granite type in the studied area. Field occurrence never showy any clear relationship between Chindong granitoid and Masanite in Chindong area, but Masanite intuded into Bulgugsa granitoid in Masan area. Relationship between Chindong granitoid and Bulgugsa granitoid is ambiguous, but Chindong granitoid is thought to be early in view of the trend of chemical composition and higher content of hornblende in Chindong granitoid. Masanite is the latest intrusive granitoid in this area. The studied granitoids are discordant plutons intruding Cretaceous sediments, epizonal masses, and emplaced by stoping. Fractional crystallization of calr-alkalis magma, which is granodioritic or andesitic in composition and formed by melting of the subductyd Kula-Pacific crust under the continental crust along the boundary between compressional Eurasian plate and Kula-Pacific plate, yielded the granitic rock facies in the range of quartz diorite of Chindong granitoid to granite of Masanite.
5,200원
7.
1991.09
구독 인증기관 무료, 개인회원 유료
Geological application on the thermal history and thermal state in the sedimentary basin generally includes following tour topics. 1) Initial temperature/ depth, time/ temperature variations for oil and gas generation from petroleum window concept. 2) Time Temperature Index variations based on hydrocarbon generation rate due to temperature rise. 3) Kinetic approach with time and fractional yield. 4) Geological analysis on dike intrusion/ stretching based un temperature, time variation model of dll Ar/39Ar isotope.
4,000원
8.
1991.09
구독 인증기관 무료, 개인회원 유료
Gravity survey was conducted to investigate subsurface structure of the Bupyung caldera. Two profiles of about 23 ㎞ and 21㎞ length were chosen across the caldera and gravity values were measured at 333 points on those profiles. The regional gravity trend of the survey area is mainly attributed to isostasy. The maximum negative gravity anomaly over the caldera appears to be -8.5m gal. Gravity profiles were analyzed and interpreted by using power spectrum analysis, Marquardt-Levenberg inversion and ideal-body inversion methods. The result of 2-D inversion shows the existence of the low density structure of about 8km surface width and 3km depth under the caldera. Since the caldera has three dimensional, 2-D gravity inversion results in relatively large error as compared with 3-D modeling. Fortran subroutine was coded to calculate the gravity anomalies caused by 3-D subsurface bodies. The result of 3-D modeling shows the Bupyeong caldera can be approximated by basin-shaped low density body whose depth reaches to 3㎞. At this depth level we assume that there exist a nearly flat boundary between granite batholith and metamorphic rock out side of the caldera. The negative anomaly of Bupyeong caldera appears to be caused by density contrast between low-density granite inside the caldera and surrounding metamorphic complex. Relationship between the defect mass and the diameter of Bupyeong caldera satisfies general relationship observed in world-wide volcanic calderas.
4,200원
9.
1991.09
구독 인증기관 무료, 개인회원 유료
The earth science was set down as a regular subject of high-school curricilum in 1956 and has been constantly transited since then. This study is to discover the theoretical basic of science education by analyzing the background of formation of the curriculum and the process of transition. The aim of this study is to give an important suggestions for the future Earth Science Education. The summary of the study and suggestions for the sixth amendment of Earth Science curriculum are as follows 1. To promote the development of Science Education, Science subjects should be decided to be a compulsory subject by authority and supported financially. 2. It is necessary that the Earth Science be selected as a required subject in both human and natural course ; at least 4 unit for the human study course, and 8 unit for the natural course. 3. In the sixth amendment of curriculum the Earth Science should be fixed as a regular compulsory subject and both experiment and practice should be reinforced.
4,200원
