Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean earth science society
Journal Basic Information
Journal DOI :
The Korean Earth Science Society
Editor in Chief :
Volume & Issues
Volume 20, Issue 6 - 00 1999
Volume 20, Issue 5 - 00 1999
Volume 20, Issue 4 - 00 1999
Volume 20, Issue 3 - 00 1999
Volume 20, Issue 2 - 00 1999
Volume 20, Issue 1 - 00 1999
Selecting the target year
추도사 ( 한국지구과학회지 : 1999 년 제 20 권 제 1 호 )
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 1~1
A Development of Multimedia Learning Program for Internet Considered Learner Ability - With Astronomical Contents of High School Earth Science -
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 3~3
Most of astronomical concepts include spacial concepts, the spacial concepts are linked with time concept. So the understanding for the spacial concept is very hard, need level specific instructional methods. Therefore, in this study developed multimedia Teaming program using internet after analying by levels(normal level, supplementary level, deepening level) for the high school astronomical contents. And the results of applying the program for 100 users gave affirmative answers, the program is offering on internet now.
Analysis on 'The Beds and Fossils' Unit in Elementary Science Textbook from the Constructivist Perspective
Bae, Yeong-Bu ;
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 18~18
Analyzing the current 4th grade of elementary science textbook by focussing the contents of unit of the beds and fossils shows that the current textbook of the 6th curriculum was written from weak constructivism. As constructivist perspective makes it possible to enhance creativity and problem-solving ability in science teaching and learning, new textbook and teaching-learning model is required. Hence, newly developed textbook and teaching-learning model should be introduced in the more advanced elementary science education.
Faulting Processes and K-Ar Ages of Fault Gouges in the Yangsan Fault Zone
Jang, Tae-U ;
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 25~25
Microstructural research, XRD analysis and K-Ar age dating were performed with fault gouge samples taken from the Yangsan fault zone. Most of thin sections in microstructural study show that clay minerals have well grown under the influence of hydrothermal alteration in the matrix of the fault gouges and define clay foliations with parallel alignments. The foliations in the gouge zones could be interpreted as the latest products of faulting, since the preexisting features are not easy to be preserved through extensive reworking during faulting. Deformation mechanism in the gouge zones operated with the cataclasis of brittle deformation in the early stage of deformation and transferred subsequently to cataclastic flow in the regions of maximum localization of fault slip. Fluid-assisted processes were also occurred significantly in the gouge zones with every faulting. Clay minerals formed in the gouge zones are composed predominantly of smectite and illite/smectite (I/S) mixed-layers, with accessory illite, chlorite and kaolinite. Smectite is characterized by a dioctahedral type and I/S mixed-layers contain 70% smectite layers in the structure with R1 type in which smectite and illite layers are regularly alternated with each other. Illite is found to have the 1Mc1 polytype that is stable at low temperature, and its crystallinity ranges from 0.41 to 0.43. Illitization of smectite that was initially formed in gouges is considered to proceed through I/S mixed-layers in which the percentage of illite interlayers typically increases with reaction processes. Considering clay mineral characters analyzed, they were formed at relatively low temperatures during relatively a short period. K-Ar ages of the gouges derived from Bulguksa granites (Tdo and A₂) show 58.7 Ma and 50.3 Ma, and volcanic rocks of the Yuchon Group (Bhwa) 37.3 Ma. The ages of fault gouges are interpreted to represent those of hydrothermal alteration following the fault movements, corresponding to the early or old events of the Yangsan fault activities. The ages of 58.7 Ma (Tdo) and 50.3 Ma (A₂) which were gotten from the gouges taken along Quaternary faults mean that these faults reactivated along the preexisting faults in Quaternary.
Characteristics of Submarine Environment of Coastal Fishing Ground around the Cheju Island - The Sedimentary Environment of Coastal Region Adjacent to Sogwipo Harbor -
Yun, Jeong-Su ; Jeong, Deok-Sang ;
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 38~38
The distribution patterns of surface sediments, geochemical characteristics, sedimentation rate and the seasonal variations of suspended particulate matters in water around the Sogwipo harbor were investigated in order to define the coastal sedimentary environment. In the studied area, there are three types of surface sedimentary facies. The shell sand fades are distributed in the western coastal area, the mixed sedimentary fades are distributed in the central and eastern regions, and the muddy sand sediments which is the zonal distribution patterns of eastwest direction are distributed in the offshore of southeastern part. The content of organic carbon which ranges from 3.2o to 8.26% in the sediments increases with the decrease of grain size, but the sediment grain size are not exerted an strong influence on the organic carbon content around the Sogwipo harbor and the Bomokdong coastal area. The organic carbon content gradually decrease toward the southern offshore direction. The total concentration of Al, Cu, Mn, and Cr is high in the southeastern offshore area and the area adjacent to the Sogwipo port which is covered mainly with muddy sand sediments. This distribution pattern coincides with grain size. However, the Pb, Fe, Zn and Ni contents do not follow such an overall distribution pattern, they ate decreasing gradually with an increase of distance from the coastal zone. The concentration of total suspended matters shows great seasonal variation with high contents during summer and spring season, and low concentration during autumn season. These phenomena probably result from high discharge of riverine suspended matters during the summer season, and the sediments resuspension when strong northwest and northeast winds predominate in spring. The annul mean value of VSS/TSS ratio is 34.43%, which are not high level compared with those of other polluted sea area. This ratio is high in summer and low in winter, and maximum values in the enclosed environment of Sogwipo harbor. The use of Pb-210 geochronologies to estimate sedimentation rate in the study area shows 0.10 cm/yr. This suggests a maximum accumulation rate in the study region with ignoring the mixing effect. The sedimentation rate measured using maximum peak concentration of Cs-137 in a sediment profiles ranges from 0.12 to 0.15 cm/yr, which agrees well with the Pb-210 calculated data 0.10 cm/yr from that of same samples. More than 14.09 × 10^(-6) emu/g high concentration of magnetic susceptibility in the sediments are found around the Sogwipo port coastal area and the magnetic susceptibility gradually decreases toward the southern offshore direction. This may be caused by the fact that Sogwipo harbor is an almost enclosed environment and many industrial works are establish recently.
Raindrop Imprints from the Late Proterozoic Sangwon System of the Socheong Island of Ongjin-gun, Incheon, Korea
Kim, Jeong-Ryul ; Kim, Gyeong-Su ;
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 55~55
Raindrop imprints are firstly discovered from the Late Proterozoic Sangwon System of the Socheong Island, Korea. These are preserved on the bedding plane of purple shale. The strata preserving raindrop imprints are interpreted to have been deposited in the tidal flat environment which was temporally subaerial-exposed on the basis of associated sedimentary structures such as stromatolites, algal mats and mud cracks. These are, as far as is known, the oldest raindrop imprints (ca. 1.0 Ga) ever to be reported in Korea.
Petrology and Petrochemistry of the Granitoids in the Geoje Island, Korea
Lee, Chun-Hui ;
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 61~61
The granitoids in Geoje island are classified into diorite, Jisepo granodiorite and Geoje granite. The Jisepo granodiorite (biotite-hornblende granodiorite) is homogeneous in mineralogy, chemistry and texture, whereas the Geoje granite is inhomogeneous. The Geoje granite is thus divided into normal biotite-hornblende granite, porphyritic granite, and micrographic granite occurring as dike. According to petrochemistry of major and trace elements, the granitoids in Geoje island are plotted in the range of intermediate alkalic to alkalic-rich and salic in the variation of Niggli values. The granitoids are generally metaluminous to peraluminous, medium to high-K in the variation of alumina and potassium content respectively. The granitoids in Geoje island are differentiated from calc-alkaline series magma, similar to the Cretaceous to early Tertiary granitoids in southern Korea. The temperature of minimum melts probably ranges 750℃ to 700℃ under 2 kbar total pressure. The geochemical characteristics indicate that the Geoje granitoids may be continental arc to volcanic arc granite fractionated from a talc-alkaline magma which was derived from partial melting of mantle or igneous protoliths of the lower crust under the compressional plate margin.
Petrology of the granitoids in the Namsan-Tohamsan area around Gyeongju, Korea
Lee, Jun-Dong ;
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 80~80
The granite mass is widely distributed in the western part of Gampo quadrangle (1:50.000) and extended to the eastern part of Moryang quadrangle. The mass is elongated in the direction of N20 W in Gampo quadrangle. It discordantly intrudes the Cretaceous sediments which is called Taegu Formation and contacts with Tertiary volcanic and sedimentary rocks. Granitoids are divided into the following six facies ; granodiorite, senate- textured granite, porphyritic granite, equigranular granite, micrographic granite, and alkali-feldspar granite. Especially there are three different groups in the normative orthoclase percent in the above six facies. Those are granodiorite, senate-textured granite, and late-stage fades which includes porphyritic granite, equigranular granite, micrographic granite, and alkalifeldspar granite. The continuous variation of chemical compositions is shown in the order of granodiorite→seriate-textured granite→porphyritic granite→equigranular granite→micrographic granite→alkali-feldspar granite. According to chemical variation diagrams, granitoids can be classified into two groups. Early differentiates including granodiorite and seriate-textured granite crystallized initially and after lapse of a certain time, late differentiates like porphyritic granite, equigranular granite, micrographic granite, and alkali-feldspar granite crystallized and solidified. The granitoids are continuous differentiation products from a certain magma. It is considered that at a certain stage of the crystallization the portion composed of much amount of liquid and small amount of suspended andesine and other refractory minerals was differentiated and crystallized to the granite.
Heavy Metal Contamination of Stream Sediments from the Yeongsan River and Kwangju Stream, Kwangju
Kim, Ju-Yong ; Jeong, Cheol-Hwan ; O, Gang-Ho ; Go, Yeong-Gu ; Mun, Jeong-Jun ;
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 96~96
In order to investigate the extent and degree of contamination in the Kwangju area, sediment samples from the Kwangju Stream and the upper stream of the Yeongsan River were analyzed for heavy metals, organic matter and grain size of sediments. The results show that a wide range of content was apparent for every heavy metal, and that a certain area was contaminated seriously. Representative pollutants such as Cu, Zn and Pb show high concentration in industrial complex and overpopulated areas, which reflects the effects of industrial waste water and sewage. Similar behavior among heavy metals suggests a possibility that less concentrated metals such as Mn, Cr and Ni may act as potential pollutant if contamination of stream sediments is maintained.
Study of Fault Characteristics by Trench Survey in the Sangchon-ri Area in the Southern Part of Yangsan Fault, Southeastern Korea
Gyeong, Jae-Bok ; Lee, Gi-Hwa ; Atsumasa Okada ;
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 101~101
Quaternary movement of the Yangsan fault at Sangchen-ri area was interpreted by aerial photograph, field survey, trench survey, soil stratigraphy, and TL age dating of fault gouge materials. The geomorphological evidences associated with active fault are clearly shown along the fault trace about 9 km long from Eonyang to Tongdo-sa area. The main Yangsan fault is accompanied with wide shattered zones exceeding tens of meter wide with a remarkable fault gouge in the direction of NNE-SSW. Other adjacent subsidiary faults parallel to the main one have almost vertical fault planes displacing the higher terrace deposits in the trench site. The predominantly right-lateral movements were recognized by the low angle striation on the fault plane, elongation of breccia, and plastic deformation within the fault gouge zone. It seems that the Yangsan fault shows active movements with vertical displacement of more than 10 meters after formation of the higher terrace in the late Quaternary (25∼50 ka), as is identified by offset of terrace surface and fault sections in the trench survey. The preliminary TL dating results using fault gouge materials indicate that the latest event of the fault activity may be younger than about 100 thousand years B.P.
Occurrence and Geological Significance of Stromatolites from the Precambrian Strata in the Socheong Island, Incheon, Korea
Kim, Jeong-Ryul ;
Journal of the Korean earth science society, volume 20, issue 1, 1999, Pages 111~111
Stromatolites are firstly described from the limestones of the Pricambrian Sangwon System in the Socheong Island, Incheon, Korea. They are described as Baicalia f.1, B. f.2, B. f.3., Inzeria f., Jinshanzhaiella pulchellusa, and Linella cf. simica. Stromatolites from the Sangwon System in the Socheong Island are similar to stromatolite assemblage VI and VII representing the Precambrian Qingbaikou System in China. Based on the stromatolites and lithology, the stromatolite - bearing strata in the Scheong Island are possibly correlated with the Late Proterozoic Mukchon and Myoraksan Series, upper part of the Sangwon System which is mostly distributed in North Korea. On the basis of the morphology of stromatolites characterized by mainly vertically-stacked hemispherical forms with mud cracks and rain prints, the strata in the Socheong Island seem to be deposited in the warm and shallow tidal flat environment. This is the first report on the occurrence and description of the Precambrian stromatolites which are the oldest fossils ever discovered in Korea.