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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean earth science society
Journal Basic Information
Journal DOI :
The Korean Earth Science Society
Editor in Chief :
Volume & Issues
Volume 19, Issue 6 - 00 1998
Volume 19, Issue 5 - 00 1998
Volume 19, Issue 4 - 00 1998
Volume 19, Issue 3 - 00 1998
Volume 19, Issue 2 - 00 1998
Volume 19, Issue 1 - 00 1998
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On the Seasonal Variations of the Heat Budget in the Yellow Sea
Yun, Yong-Hun ; Kim, Tae-Hui ;
Journal of the Korean earth science society, volume 19, issue 1, 1998, Pages 1~1
The total heat budget has been calculated with the meteorological and oceanographic data in the Yellow Sea from 1981 to 1990. In winter, the incoming solar radiation is almost balanced with outgoing back radiation, but the ocean losses its heat through the sea surface mainly due to the latent heat flux and the sensible heat flux. The amounts of heat outflow is between 100 and 400
in wintertime and is between 50 and 200
in summertime. The largest value of inflow exists shown in the southwestern coasts of the Korean Peninsula in June (200
). The largest value of outflow is shown in the northwestern sea of Cheju Island in December (350
). The variations of the total heat outflow in the southern part of the Yellow Sea are larger compared to the northern part and central coast areas in the Yellow Sea.
Palaeomagnetic Results from the Okchon Belt: Anisotropy of Magnetic Susceptibility(AMS) and Tectonic Stress Field in the Northeastern Okchon Belt
Choe, Eun-Gyeong ; Kim, Seong-Uk ;
Journal of the Korean earth science society, volume 19, issue 1, 1998, Pages 9~9
A study of anisotropy of magnetic susceptibility(AMS) was conducted on the Cambrian-Triassic strata in the northeastern part of the Okchon belt. A total of 951 independently oriented core samples were collected from 103 sites throughout the area. The study results show that 13 sites are characterized by magnetic lineation, 28 sites by load foliation, and 23 sites by tectonic foliation. Magnetic lineations created by paleocurrent are predominant in the Cambro-Ordovician sedimentary rocks (mostly limestones). Load foliations caused by the weight of the overlying strata occur throughout the area regardless of the geologic age of the strata. Tectonic foliations created by compressional tectonic force show a gradual regional variation in direction: Direction of compression axes derived from tectonic foliation in the southwestern part of the study area (Yongwol area) is approximately E-W, while it changes gradually into WNW-ESE and NW-SE in the central part of the study area (Pyongchang, Yemi and Chongson area). It becomes finally N-S in the northeastern part of the study area (Kangneung area). Such compressional directions are compatible with the thrust directions in each area. It is therefore concluded that the major thrusts in the study area have been formed during this compressive deformational phase, such as the Kagdong thrust, the Pyongchang shear zone and the Paegunsan syncline. The compression directions of Cambrian-Permian strata achieve better clustering without the bedding-tilt correction, whereas those of early Triassic strata become better clustered after the bedding-tilt correction. This fact indicates that the time of tectonic compression was between late Permian to early Triassic time. The direction of compression was NW-SE. In view of the fact that the compression and thrust directions coincide with each other, the compressive stress was associated with the Songnim Disturbance, a major orogenic event in the Korean peninsula. The Songnim Disturbance must have been in turn an expression of the South/North China Blocks collision, a late Permian to the early Triassic event suggested by palaeomagnetic data. The collisional force was transferred to the surrounding area, forming the fanning trajectory from a promontory with a variation of stress direction from area to area as described above.
A Geochemical Study on the Thermal Water and Groundwater in the Hot Spring Area, South Korea
Kim, Gyu-Han ;
Journal of the Korean earth science society, volume 19, issue 1, 1998, Pages 22~22
Most hot springs in South Korea are closely related to the Mesozoic granitic batholith. Temperatures of the hot springs which are pumping from 100 to 800 m depth, range from 25℃ to 73.6℃ with an average value of 55℃. A total 41 thermal water and groundwater samples from the hot spring area were analyzed by IC and ICP methods to interpret the water-rock interaction and to access hydrochemical characteristics. No difference in Eh between thermal water and groundwater was found. TDS values in groundwater increase with conductivity values. Thermal waters, however, show a range of behavior. Thermal waters (av. pH=8.2) are more alkaline than groundwaters (av. pH=7.3). Based on the cluster analysis, the chemical compositions of thermal water were divided into two groups, namely: the
rich type and the
rich type. The thermal waters have high concentrations of SiO₂, CaO and
than those of the groundwater in the same hot spring area. They also have a good correlation between Ca and Sr (r=0.5) and
(r=0.6). This indicates a relatively high degree of water-rock interaction even though the temperature of the thermal field is low. Increasing
in thermal water with temperature supports the above conclusion.
Geochemical Dispersion of Heavy Metal in Diorite and Around Soils at the Kwangyang Mine
Park, Cheon-Yeong ; Kim, Hui-Nam ;
Journal of the Korean earth science society, volume 19, issue 1, 1998, Pages 35~35
Rock and soil (A horizons) in the around abandoned Kwangyang mine area were sampled for the investigation of the pollution by heavy metal. Contents of Cd, Pb, As and Cu in all sampled soils from mountain, farm field, paddy field and sludge in the vicinity of the Kwangyang mine are significantly higher than the published worldwide mean values of those in soils. The average content of As, Cd, Cu, Pb, Zn in soils collected from tailling is 848 ppm, 11.1 ppm, 1504 ppm, 551 ppm, 827 ppm, respectively, and therefore, tailling site may be the major contamination sources in this study area. The pH values of soil samples range from 4.4 to 5.7, and loss-on-ignition values are in the range from 1.25 to 2.26%. MgO, CaO and Na₂O, As, Bi, Sb and Pb were significantly differenced in the mean content between the rock and soils, because those elements are very high characteristic of solubilities and mobilities. As element was highly enriched in this study area soils in comparison with Law of Soil Environmental Conservation Value in the Korea, such as Cd and Cu in sludge soils have been contaminated comparing with those value. In the discrimination analysis, types of soils were classified in 72.72% by discriminative function in terms of major elements mainly with CaO, MgO, MnO and Al₂O₃, and in 72.73% by those in terms of trace elements with Bi, Sb, Cd, As and Tl. Through regression analysis, independent variables such as heavy elements are observed to be highly correlated with high values in partial regression coefficients, which suggest that these elements might be significantly associated in enrichment processes of heavy elements in this study area.
Petrochemical and Petrogenesis on Igneous Plutons in Jeonju-Jeongeub Area
Kim, Yong-Jun ; Lee, Chang-Sin ;
Journal of the Korean earth science society, volume 19, issue 1, 1998, Pages 56~56
Igneous plutons in the Jeonju-Jeongeub area are as follow petrochemical features and petrogenesis. Igneous plutons in this area are composed of foliated granites (foliated biotite granodiorite, foliated porphyritic granodiorite and foliated two mica granite) and undeformed Songrim-Daebo granites (biotite granodiorite and porphyritic granodiorite). Foliated granites are deformed phase of Pre-Daebo Orogeny, and obtain isotopic ages of early Permian to late Triassic (276-200 Ma). The most of foliated granites and undeformed granites mass are igneous complex consisting of a series of differential products of cogeneric magma. Chemical composition of plagioclase and mica of these rocks show similar to trend of whole rock chemical data, especially barometer of amphibole in undeformed granites corresponded to estimated emplacement depth of previous paper. Igneous plutons plotted on Haker diagram shows parallel trend of calc-alkalic rock series. REE pattern indicated that LREE amount of foliated and undeformed granites in this area are more enriched than HREE, and (-)Eu anomalies are weaker than other area. Parental magma type of these rocks in this area correspond to I-type, syn-Collision type and Hercyano type granites. In compressive stress field between Ogcheon folded belt and Youngnam massif, foliated granites and undeformed granites had formed due to distribution of heterogeneous stress. Those data indicate magma of these rocks would had been generated by melting in lower and middle crust
Groundwater Development of So-Yang Dam area in Kangwon-Do
Seo, Baek-Su ; Kim, Seong-Mun ;
Journal of the Korean earth science society, volume 19, issue 1, 1998, Pages 78~78
This study was conducted to develop groundwater using an electrical prospecting method. First, a new algorithm using the finite element and sensitivity analysis was developed. Next, model experiment was conducted and experimental data was compared to the theoretical inversion data. Finally, the field electrical prospecting data around Soyang Dam area was calculated by this inversion method. The developed algorithm was applied to a numerical example that has a simple subspace structure. A good image was obtained without any smothing technique. Accuracy of the technique was confirmed by comparing theoretical inversion data to the experimental data. This study is able to aid the development of groundwater, underground space and protection system of environmental contamination.
Determination of The Astronomical Longitude and Latitude of Won-ju High School Observatory
O, Lee-Hwan ;
Journal of the Korean earth science society, volume 19, issue 1, 1998, Pages 85~85
The precise astronomical longitude and latitude of the Won-ju high school observatory was determined by using a DTS theodolite over 4 days from Feb. 14 1996 to Feb. 25, 1996. For the longitude and latitude determinations, we observed the meridian transit times (KST) and meridian altitude of the 4 stars, α Aur, α Ori, β Tau and β Aur. The resultant astronomical longitude and latitude of the Won-ju high school observatory are 127° 57′ 43″.60(E)±0″.56 and 37° 20' 40″.49(E)±0″.91, respectively.
A Study on the Environmentally Compatible Use of Defense Materials
Han, Uk ;
Journal of the Korean earth science society, volume 19, issue 1, 1998, Pages 92~92
The military must comply with the environmental policies and law unless affecting its ability to protect the country. The weapon system developers and managers try to seek new solutions that meet performance requirements and with less adverse effect on the environment. Most of the experiences with cleanup of the contaminated military sites have been made in the Europe and North America. Like contaminated civil sites, the contaminated military sites are mainly polluted by conventional contaminants such as petroleum hydrocarbons, heavy metals, solvents, etc. The military sites contaminated with explosives, ammunitions and radioactive need specific cleanup technologies. The research and development area for contaminated military sites are development of innovative cleanup technologies, development of new risk assessment methods, and research on the migration and natural degradation of contaminants in the natural systems.
Global Warming and Recent Retreat of an Ice Cliff on King George Island, South Shetland Islands, West Antarctica
Jang, Sun-Geun ; Yun, Ho-Il ;
Journal of the Korean earth science society, volume 19, issue 1, 1998, Pages 101~101
Global warming was briefly discussed in terms of history, observed phenomena, and incurring hazards. Marian Cove is a fjord situated in Maxwell Bay on the southwestern coast of King George Island, South Shetland Islands, West Antarctica. The comparison of aerial photographs clearly shows that the ice cliff of Marian Cove retreated approximately 250 m between December 1956 and December 1986, but advanced around 40 m between December 1986 and January 1989. A topographic survey carried in January 1994 again revealed that the ice cliff of Marian Cove had retreated around 270 m since January 1989. The extent of retreat during the recent 5 years (1989~1994) is approximately the same as during the former 30 years (December 1956 to December 1986). This ice cliff retreat is indicative of a possible evidence for the procession of recent regional atmospheric warming.