Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Economic and Environmental Geology
Journal Basic Information
Journal DOI :
The Korean Society of Economic and Environmental Geology
Editor in Chief :
Volume & Issues
Volume 40, Issue 6 - Dec 2007
Volume 40, Issue 5 - Oct 2007
Volume 40, Issue 4 - Aug 2007
Volume 40, Issue 3 - Jun 2007
Volume 40, Issue 2 - Apr 2007
Volume 40, Issue 1 - Feb 2007
Selecting the target year
Hidden Porphyry-Related Ore Potential of the Geumseong Mo Deposit and Its Genetic Environment
Choi, Seon-Gyu ; Park, Jung-Woo ; Seo, Ji-Eun ; Kim, Chang-Seong ; Shin, Jong-Ki ; Kim, Nam-Hyuck ; Yoo, In-Kol ; Lee, Ji-Yun ; Ahn, Yong-Hwan ;
Economic and Environmental Geology, volume 40, issue 1, 2007, Pages 1~14
The Guemseong mine is located near the southern margin of the Jurassic Jecheon granitoids collectively with the Cambro-Ordovician mixed dolostone-limestone series of the Yeongweol Group, Choseon Supergroup. Here, two spatially distinct types of skarn formation have been observed. The upper transitional skarn is the calcic Mo skarn which has the mineral assemblage of
within the calcite marble. On the other hand, the lower proximal skarn occurs as a discordant magnesian Fe skarn at the contact of Mo-bearing aplitic cupolas with unidirectional solidification texture(UST) within the dolomitic marble. The magnesian Fe skarn has the mineral assemlage
. The formation of two different types of skarn and ore mineralization in Geumseong mine have been attributed to multistage and complex metasomatic replacements that ultimately resulted in silicate-oxide-sulfide sequence of metasomatism. An early prograde stage with anhydrous skarn minerals such as olivine, clinopyroxene and/or garnet with magnetite, formed from high temperature (about
) at an environmental condition of low
fugacity ($XCO_2<0.1$) and 0.5 kbar. The later retrograde stage with hydrous silicates such as amphibole, serpentine, phlogopite, epidote and chlorite with molybdenite or hematite, termed from relatively lower temperature (about
Dispersion and Enrichment of Potentially Toxic Elements of Farmland Soils from the Boeunjeil Mine Area, Korea
Yoo, Bong-Chul ; Kim, Ki-Jung ; Lee, Chan-Hee ; Lee, Hyun-Koo ;
Economic and Environmental Geology, volume 40, issue 1, 2007, Pages 15~28
The study is for contaminations of major, rare earth and trace elements of the farmland soils from the Boeunjeil mine area. The results are compared with the soils of Chungjoo, Deokpyeong, Boeun and Chubu areas. Fe and S contents of the contaminated area are high relative to those from the uncontaminated areas, Chungjoo and Boeun areas. Trace elements of the contaminated area are high relative to those from uncontaminated area, Chunajoo, Deokpyeong, Boeun and Chubu areas. The trace elements ares divided into Cd, Ni, Sr, U, V, Zn and As, Co, Cu, Mo, Pb, Sb, based on these dispersion and correlation. Two groups show the positive correlation. Enrichment factor of potentially toxic elements from contaminated area is >5 value, but <4 value in the uncontaminated area. In the geoaccumulation index of the minor elements, the contaminated area has >1 value and the uncontaminated area has <1 value except Mn. Enrichment index of potentially toxic elements(As, Cd, Co, Cu, Ni, U, Zn) ranges from 0.3 to 87.0 in the contaminated area and from 0.4 to 3.9 in the uncontaminated area. Overall results show that the high contents of farmland soils for the elements(Fe, S, As, Cd, Co, Cu, Ni, U, Zn) indicate the contamination by coal-related activities.
Effect of Redox Processes and Solubility Equilibria on the Behavior of Dissolved Iron and Manganese in Groundwater from a Riverine Alluvial Aquifer
Choi, Beom-Kyu ; Koh, Dong-Chan ; Ha, Kyoo-Chul ; Cheon, Su-Hyun ;
Economic and Environmental Geology, volume 40, issue 1, 2007, Pages 29~45
Biogeochemical characteristics involving redox processes in groundwater from a riverine alluvial aquifer was investigated using multi-level monitoring wells (up to 30m in depth). Anaerobic conditions were predominant and high Fe (
) and Mn (
) concentrations were observed at 10 to 20 m in depth. Below 20 m depth, dissolved sulfide was detected. Presumably, these high Fe and Mn concentrations were derived from the reduction of Fe- and Mn-oxides because dissolved oxygen and nitrate were nearly absent and Fe and Mn contents were considerable in the sediments. The depth range of high Mn concentration is wider than that of high Fe concentration. Dissolved organics may be derived from the upper layers. Sulfate reduction is more active than Fe and Mn reduction below 20 m in depth. Disparity of calculated redox potential from the various redox couples indicates that redox states are in disequilibrium condition in groundwater. Carbonate minerals such as siderite and rhodochrosite may control the dissolved concentrations of Fe(II) and Mn(II), and iron sulfide minerals control for Fe(II) where sulfide is detected because these minerals are near saturation from the calculation of solubility equilibria.
Geological Environments and Deterioration Causes of the Sitting Buddha Carved on Rockcliff in Bukjiri, Bonghwa
Hwang, Sang-Koo ; Nam, Jae-Guk ;
Economic and Environmental Geology, volume 40, issue 1, 2007, Pages 47~66
The Sitting Buddha Carved on Rockcliff (National treasure No. 201) in Bukjiri consists of porphyritic biotite granite, which was fractured by three joint sets of NE-SW, EW and NS directions. They produced a physical weathering that broke many parts of the Buddha and background. The chemical index of alteration is 59 to 61 from the major elements in the granite that was weathered into producing kaolin minerals from alteration of feldspars and biotite. With weathering degree, major element compositions increase in
and MnO, whereas decrease in
. Change proporations of trace elements to
increase in all transition elements, Rb and Y, whereas decrease in Li, Sr and Ba. REE pattern increases only in HREE. Particularly, a decrease in CaO,
, Sr and Ba results in what they are effluxed to dissolve from feldspars by groundwater. The Buddha image has been deteriorated into joints, color changes, brown rusts, granular decay, microorganic smears by the such weathering causes as deformation, moisture, temperature variation and microorganic living. The moisture, which leaks along the joints in the granite, not only dissolve to decompose minerals but also grows many microorganism and is frozen over during winter. NE-SW and NS joint sets affect to seep in water during rainy days to deteriorate the image because they extend outward.
Geoelectrical Structure and Groundwater Distribution in the South-eastern Region of Jeju Island Revealed by Controlled Source Audio-frequency Magneto Telluric (CSAMT) survey
Yang, Jun-Mo ; Kwon, Byung-Doo ; Lee, Hei-Soon ; Song, Sung-Ho ; Park, Gyeo-Soon ; Lee, Kyu-Sang ;
Economic and Environmental Geology, volume 40, issue 1, 2007, Pages 67~85
We have performed the CSAMT survey to examine the geoelectrical structure and groundwater distribution for two survey lines across the south-eastern region of Jeju Island. Three kinds of 1-D inversion techniques were employed taking account of the geological situation around the observation sites, and their inversion results were concurrently compared and analyzed to improve the reliability of interpretation. The resultant inverted resistivity structures reveals the three-layered structure, which is composed of the layers with a high-low-lower resistivity from the surface downward. Through the comparison of the inverted resistivity model and core log of deep borehole nearby observation sites, the lithology of each inverted layer was inferred. The first layer and second layer corresponded to the basaltic layer with a thickness of
, and the third layer to the Seoguipo Formation and the U Formation; the thickness of the Seoguipo Formation could not be estimated due to the limitation of investigation depth and little resistivity difference between both Formations. Nevertheless, the Seoguipo Formation, which is strongly associated with the groundwater system in the south-eastern region of Jeju Island, showed the conspicuous spatial continuity from the middle mountain area to coastal area.
Analysis of Subsurface Geological Structures and Geohazard Pertinent to Fault-damage in the Busan Metropolitan City
Son, Moon ; Lee, Son-Kap ; Kim, Jong-Sun ; Kim, In-Soo ; Lee, Kun ;
Economic and Environmental Geology, volume 40, issue 1, 2007, Pages 87~101
A variety of informations obtained from satellite image, digital elevation relief map (DEM), borehole logging, televiewer, geophysical prospecting, etc were synthetically analyzed to investigate subsurface geological and structural characteristics and to evaluate geohazard pertinent to fault-damage in the Busan metropolitan city. It is revealed that the geology is composed of the Cretaceous andesitic
dacitic volcanics, gabbro, and granitoid and that at least three major faults including the Dongrae fault are developed in the study area. Based on characteristics of topography, fault-fractured zone, and isobath maps of the Quaternary sediments and weathered residuals of the basement, the Dongrae fault is decreased in its width and fracturing intensity of damaged zone from south toward north, and the fault is segmented around the area between the Seomyeon and Yangieong junctions. Meanwhile, we drew a geohazard sectional map using the five major parameters that significantly suggest damage intensity of basement by fault, i.e. distance from fault core, TCR, RQD, uniaxial rock strength, and seismic velocity of S wave. The map is evaluated as a suitable method to express the geological and structural characteristics and fault-damaged intensity of basement in the study area. It is, thus, concluded that the proposed method can contribute to complement and amplify the capability of the present evaluation system of rock mass.
Application and Comparison of GeoWEPP model and USLE model to Natural Small Catchment - A Case Study in Danwol-dong, Icheon-si
Kim, Min-Seok ; Kim, Jin-Kwan ; Yang, Dong-Yoon ;
Economic and Environmental Geology, volume 40, issue 1, 2007, Pages 103~113
The empirical USLE and the physically-based GeoWEPP which were distributed model linked with GIS (Geographical Information System) were applied to small natural catchment located in Icheon-si, Gyeonggi-do, South Korea. The results using by two models were total sediment yield from study catchment between January, 2004 and January, 2005. During the study period, the observed total sediment yield was 270.54 ton and the total sediment yield computed by USLE and GeoWEPP model were 358.1 ton and 283.30 ton, respectively. Each of results computed by USLE and GeoWEPP overestimated more than the observed total sediment yield, but, based on the results, the total sediment yield computed by GeoWEPP approximated to the observed result. We suggest that the reason why the total sediment yield using by models overestimated was that computed amounts by two models did not contain the amount of suspended sediment flowed over the weir.
A Modified Logistic Regression Model for Probabilistic Prediction of Debris Flow at the Granitic Rock Area and Its Application; Landslide Prediction Map of Gangreung Area
Cho, Yong-Chan ; Chae, Byung-Gon ; Kim, Won-Young ; Chang, Tae-Woo ;
Economic and Environmental Geology, volume 40, issue 1, 2007, Pages 115~128
This study proposed a modified logistic regression model for a probabilistic prediction of debris flow on natural terrain at the granitic rock area. The modified model dose not contain any categorical factors that were used in the previous model and secured higher reliability of prediction than that of the previous one. The modified model is composed of lithology, two factors of geomorphology, and three factors of soil property. Verification result shows that the prediction reliability is more than 86%. Using the modified regression model, the landslide prediction maps were established. In case of Sacheon area, the prediction map showed that the landslide occurrence was not well corresponded with the model since, even though the forest-fred area was distributed on the center of the model, no factors were considered for the landslide predictions. On the other hand, the prediction model was well corresponded with landslide occurrence at Jumunjin-Yeongok area. The prediction model developed in this study has very high availability to employ in other granitic areas.
Experimental Evaluation of an Analytical Method for Chlorofluorocarbons (CFSs) in Air and Water Using Gas Chromatography
Koh, Dong-Chan ; Choi, Beom-Kyu ; Kim, Yong-Je ;
Economic and Environmental Geology, volume 40, issue 1, 2007, Pages 129~140
CFC(CFC-12, CFC-11 and CFC-113) analytical system for air and water was constructed using a customized purge and trap extraction device and a gas chromatograph with an electron capture detector. Sampling methods of air and water for CFCs were also established. The analytical system was experimentally optimized to result in reproducibilities of triplicates less than 2% for current air samples and less than 5% for groundwater samples with CFC-12 concentration of 160 to 180 pg/kg, and verified with respect to the CFC system in USGS, which showed analytical results were in agreement within 10%. CFCs in air were monitored at three sites over 19-month period in the central part of South Korea, and the result indicates no significant local sources of CFCs in those areas. For groundwater in Jeju Island, CFCs were measured over a year with a two-month interval. The time-series data showed seasonal fluctuations which could be interpreted by the effect of recharge pulse derived from large amount of rainfall during monsoon period with a few month delay, which indicates high permeability of basaltic rocks in Jeju Island.