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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean earth science society
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Journal DOI :
The Korean Earth Science Society
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Volume & Issues
Volume 18, Issue 6 - Dec 1997
Volume 18, Issue 5 - 00 1997
Volume 18, Issue 4 - 00 1997
Volume 18, Issue 3 - 00 1997
Volume 18, Issue 2 - 00 1997
Volume 18, Issue 1 - 00 1997
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Development of CBI CD-ROM on Astronomy Field of High School Earth Science
Journal of the Korean earth science society, volume 18, issue 5, 1997, Pages 347~347
Multimedia CBI (Computer Based Instruction) for 'Astronomical Field' of High School Earth Science was developed with IBM PC compatible computer using authoring tool ToolBook (Ver 5.0). The contents of this program is composed of `telescope ,astronomical observation, star and universe . This program is tutorial type, and made up astronomical instruction with many multimedia functions, video, audio, animation, simulation, photograph, etc.. The result of applying to 44 earth science teachers showed that 95% teachers gave affirmative responses. Therefore this program will be much helpful material in astronomical instruction.
Distribution Pattern and Characteristics of the Surface Sediments in Hampyong Bay, the Southwestern Coast of Korea
Ryu, Sang-Ok ; Yu, Hwan-Su ;
Journal of the Korean earth science society, volume 18, issue 5, 1997, Pages 367~367
The surface sediments of Hampyong Bay, the southwestern coast of Korea, show several distribution patterns in accordance with areal characteristics, widely ranging pebble to clay in grain size. The coarse sediments are distributed on the subtidal zone along the main tidal channel and on the bay-head intertidal zone which is broadly developed on the frontal region of the main tidal channel. On the other hand, the fine sediments are dominated in both sides of the intertidal zone of the main tidal channel. Most pebbles are relict sediments derived from nearshore and fluvial sediments which were deposited at the time of low stand of sea level. The pebbles may be derived from the weathering of granitic gneiss and volcanic rocks distributed in the coastal area of Hampyong Bay. It is considered that, the coarse sediments, granule to fine sand, derived from weathered granitic gneisses and gneissose granites around the study area, were supplied by active coastal erosion associated with a gradual sea level uprise, and the muddy sediments are transported from the seafloor of shelf and nearshore area, and from the suspended sediments, influxing into the Yellow Sea from several rivers, and which were reworked by winter monsoon. On the basis of surface sedimentary distribution, the surface sediments in the study area are classified in five sedimentary facies: bay-mouth sand and gravel facies, inner-bay gravelly sandy mud fades, intertidal gravelly muddy sand facies, intertidal mud facies, and intertidal sand facies.
K-Ar Age Determination of the Granitic Plutons in Ulsan-Kyeongju Area, the Mid-Eastern Kyeongsang Basin, Korea
Journal of the Korean earth science society, volume 18, issue 5, 1997, Pages 379~379
K-Ar mineral ages have been determined for late Cretaceous to early Tertiary granitic plutons in Ulsan-Kyeongju area, the mid-eastern Kyeongsang Basin. The granitic plutons in the area can be grouped into two plutonic units; the Ulsan and Kyeongju plutons. The Ulsan plutons consist of hornblende biotite granodiorite, Ulsan granitic complex and porphyritic biotite granite, and the Kyeongju plutons are composed of hornblende biotite granodiorite, biotite granite and alkali granite. K-Ar biotite ages (67∼51 Ma) of the Ulsan plutons are significantly older than those (50∼47 Ma) of the Kyeongju plutons. Combined with the previous results about the cooling history of adjecent plutons and petrological information of the studied plutons, Ulsan hornblende biotite granodiorite and Ulsan granitic complex, which have K-Ar biotite ages older than 62 Ma, are thought to have been emplaced during late Cretaceous. On the other hand, Ulsan porphyritic biotite granite, Kyeongju biotite granite and Kyeongju alkali granite, which show K-Ar biotite ages younger than 54 Ma, seem to have been formed during early Tertiary. However, it is impossible to infer the emplacement age of Kyeongju hornblende biotite granodiorite, because its K-Ar biotite ages are considered to have been reset by later thermal effect. Considering the existence of early Tertiary plutons in the study area, particularly Kyeongju area, is likely to be the youngest granitic province or segment in the Kyeongsang Basin.
Characteristics of Submarine Environment of Coastal Fishing Grounds around the Cheju Island(Ⅰ) - The Sedimentary Environment of Coastal Region Adjacent to Cheju Harbor -
Yun, Jeong-Su ;
Journal of the Korean earth science society, volume 18, issue 5, 1997, Pages 387~387
This study concerns on the studies of distribution pattern and geochemical characteristics of surface sediments, and the seasonal variations of suspended particulate matters in water view for defining coastal sedimentary environment around the Cheju harbor. In the studied area, there are three surface sedimentary facies distinguished. The sand facies are distributed in the eastern coastal area, whereas the coarse and fine-grained mixed sediments are distributed in the western regions, and the mud facies are distributed in the offshore of northeastern part. The content of organic carbon which ranges from 3.07 to 13.03% in the sediment increased with the decrease of grain size. The total concentration of Al, Mn, Co, Cu, Cr and Zn increase northeastward offshore and adjacent to the Cheju port coastal area which is covered mainly with fine-grained deposits. This distribution pattern are well concide with grain size distribution. However, the patterns of Pb and Ni do not follow such on overall distribution, its decreased gradually with the increase of distance from the coastal zone. The concentration of total suspended matters show great seasonal variations with high contents during summer and winter 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 winds predominate in winter. The annual mean value of VSS/TSS ratio is 33.s8%, 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 Cheju harbor enclosed environment. The more than 18.6 × 10^(-6) emu/g high concentration of magnetic susceptibility in the sediments are found around the Cheju port coastal area and gradually decrease toward the offshore direction. This may be effected by Cheju harbor is an almost enclosed environment and many industrial works are established in recently.
A Study on the Marine Depositional Environment of Pohang to Ulsan
Yu, Hwan-Su ; Lee, Yu-Dae ; Kim, Seok-Yun ; Go, Yeong-Gu ;
Journal of the Korean earth science society, volume 18, issue 5, 1997, Pages 401~401
Submarine depositional environment on the southwestern area of the East Sea was studied by the sedimentological and micropaleontological analyses of seven surface and eight core samples from the Pohang to Ulsan coastal areas. The surface sedimentary fades are classified into clay, mud, clayey sand, muddy sand, sand, slightly gravelly muddy sand. The sediments are coarsening toward the outer shelf in the southeastern part of the study area. The core sediments are mainly consisted of thinly-laminated mud and bioturbated mud fades. Seventeen silicoflagellate species belonging to five genera are identified from the study area. The silicoflagellate assmblages include two varieties and a forma. From the silicoflagellate assemblage and sedimentological results, it is considered that the study area is mainly influenced by the warm Tsushima Current with a weaker cold water mass under active reworking and redeposition of the sediments, and the sediments having a primarily terrigenous origin in the study area were transported.by several sedimentary mechnisms as turbidites, winnowing and suspension associated with the postglacial sea level uprise. In addition, the coarse sediments in the study area is relict ones in glacial age.
A Study on the Geotechnical Characteristics of the Shallow Subsurfaces Using the Analysis of Surface Waves
Journal of the Korean earth science society, volume 18, issue 5, 1997, Pages 420~420
The purpose of this study is to develop an on-line system which will obtain the shear modules profile of shallow subsurfaces using dispersion properties of surface waves. Rayleigh waves are easily generated and experience much less attenuation than body waves. The phase velocities of Rayleigh waves change with frequencies. This is called dispersion. In this study an on-line system consisting of a 12 channel- seismogapgh, sledge hammers, and a notebook computer is developed. This easy-to-use system should be able to provide the shear modules profile in many geotechnical sites. The dispersion curves are composited by calculating the phase differences between the waves recorded at different receiver positions. The dispersion curves are used as the inputs to an inversion algorithm to make the shear modules profiles.
Petrography of the Geumsan Micrographic Granite in the Namhae Area
Journal of the Korean earth science society, volume 18, issue 5, 1997, Pages 426~426
Volcanogenic sedimentary rocks such as Unbangsan formation and tuffaceous rocks of Yucheon Group are distributed in the Geumsan area (Namhae), and the Cretaceous granitic rocks had intruded into the group. The granitic rocks are divided into granodiorite and so-called Geumsan granite from their occurrence and mineral compositions. The Geumsan granite, intruding into the granodiorite, is characterized by hypersolvus, micrographic granite. It seems like that the Geumsan granite was solidified from the H₂O-saturated, K-enriched magma under the highly super-cooled condition due to decompression. The pressure condition of the minimum melt composition of the granite is assumed to be 0.5∼2 kbar, indicating the granite is shallow-emplaced pluton. This is in good harmony with observed features of the miarolitic cavity structure and micrographic texture. Comparing the characteristics of the micrographic granites among the Geumsan, Masan, Kimhae and Busan areas, those between the Geumsan and Busan areas are similar, except the plagioclase content. The formation and the quantity of the micrographic texture in the granitic rocks seem likely to have more related to the physical factors such as intruding and cooling rates of granitic magma as well as structural condition (fault, fracture etc.), rather than the emplacing depth of the magma.
Petrochemistry and Sr . Nd Isotopic Compositions of Granitoids in the Gangjin-Jangheung Areas, Korea
Kim, Hui-Nam ; Sin, In-Hyeon ; An, Geon-Sang ; Park, Un-Seon ;
Journal of the Korean earth science society, volume 18, issue 5, 1997, Pages 433~433
The contents of major and trace elements, Rb-Sr isochron age, Sr and Nd isotopic compositions were determined for late Cretaceous granitoids in the Gangjin-Jangheung areas of the southwestern part of the Yeongdong-Kwangju depression in Korea. The granitoids of the these areas are distributed in the shape of a resurgent cauldron and have a miarolitic cavity and micrographic texture. This indicates that granitoids intruded into a shallow depth in the crust. The geochemical characters of major and trace element variation indicates that they belong to I-type and granitoids which have been crystallized from a calc-alkaline series generated by partial melting of the subducted Kula/Pacific plate at the compressional environment of continental plate margin or the volcanic arc. The REE contents show LREE to be more enriched than HREE and also slightly negative Eu anomalies. The isotopic compositions of the granitoids give a defined Rb-Sr whole rock isochron age of 71.68±2.11 Ma. The Sr initial ratio is 0.712633±0.000376, ^(87)Sr/^(86)Sr isotope ratios are 0.714041∼0.718908 (2σ) and ^(143)Nd/^(144)Nd isotope ratios are 0.511821-0.511922. In addition, εNd values are -13.24∼-15.15, εSr values are +132.59∼+161.53, and model age is 1.77∼1.95 Ga.. As a result, the isotopic evidence from granitoids of the study area indicate that their source material may be derived from partial melting of continental crust materials. The Rb-Sr whole rock isochron age of 71.68±2.11 Ma corresponds to the Maastrichtian igneous activity of the late Cretaceous period.
Characteristics of Land Surface in the Vicinity of King Sejong Station, Korean Antarctic Research Station
Journal of the Korean earth science society, volume 18, issue 5, 1997, Pages 443~443
Korea Antarcrtic Research Station, King Sejong (62°17'S, 58°47'W) is located in the northwestern tip of the Barton Peninsula, King George Island, South Shetland Islands, West Antarctica. King George Island with the dimension of 72 ㎞ long, 27 ㎞ wide, and 1,338 ㎢, smaller than Cheju Island, and it is the biggest island among South Shetland Islands. 9s% of the island is covered with ice, and the island is in the middle of the South Shetland Islands located 120 ㎞ off the Antarctic Peninsula. The general geomorphology of the Barton Peninsula shows that the area is so glacially eroded that the area is somewhat plane with several hills such as Noel Hill with 266.3 meters high, the highest peak in the Barton Peneinsula. The King Sejong Hill which is seen from King Sejong Station and is a typical cirque with the altitude of 252.2 meters is the end of an extended ridge of Noel Hill and it seems to be exposed by melting of ice during Holocene. Physical weathering is dominant on land surface around the station. Because the surface has been incessantly eroded the poles and ramps of buildings were slanted, and buried materials were exposed. Both of patterned ground and patterned beach are also formed on the relatively high plane surface and western beach to the station, respectively. Paleobeaches and old marine terraces are also shown. The beach in front of the station is being eroded away due to the attacking waves of Marian Cove fringing Maxwell Bay. Moraine deposit is also developed at the foot of the ice margin in the northern coast of Potter Cove.