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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Economic and Environmental Geology
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Journal DOI :
The Korean Society of Economic and Environmental Geology
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Volume & Issues
Volume 41, Issue 6 - Dec 2008
Volume 41, Issue 5 - Oct 2008
Volume 41, Issue 4 - Aug 2008
Volume 41, Issue 3 - Jun 2008
Volume 41, Issue 2 - Apr 2008
Volume 41, Issue 1 - Feb 2008
Selecting the target year
Hydrothermal Gold Mineralization of the Sambo Deposit in the Muan Area, Korea
Pak, Sang-Joon ; Choi, Seon-Gyu ;
Economic and Environmental Geology, volume 41, issue 3, 2008, Pages 275~286
The Sambo gold deposit located nearby the Cretaceous Hampyeong basin is composed of gold quartz fine vein(the Jija vein) within Cretaceous rhyolite showing
trends as well as
trending quartz veins(the Pungja, Gwangsan and Pungjaji veins) in Precambrian gneiss. The gold vein typically displays the intermittent and irregular fine veins within rhyolite. Electrum is disseminated in wallrock along the fine cracks as well as coexists with hematite replacing pyrite. Ore-forming fluids from the mineralized vein(
, Salinity <2.7 eq. wt.% NaCl) and NE-trending veins(
, salinity <7.9 eq. wt.% NaCl) are featured by dissimilar physicochemical conditions but their fluid evolution trends(boiling and mixing) are similar with each other. Gold veins of the Sambo deposit filled along NNW-trending tension crack are related to pull-apart basin evolution. Selective gold mineralization of the deposit reflect to dissimilarity between two ore-forming fluid sources. Consequently, gold veining of the Sambo deposit formed at shallow-crustal level and could be categorized into epithermal-type gold deposit related to tensional fractures filling triggered by Cretaceous geodynamics.
Revaluation of Strategic Metallic Commodities in the Metallic Mines within Taebaeksan-Hwanggangri Metallogenic Belt
Lee, Jae-Ho ; Heo, Chul-Ho ; Chi, Se-Jung ;
Economic and Environmental Geology, volume 41, issue 3, 2008, Pages 287~297
In order to estimate the preliminary development feasibility according to the commodity, the content of 8 strategic metallic commoditites(Pb, Zn, Cu, Fe, Mo, W, Au, U) in 68 ore specimens obtained from 34 metallic mines within the Taebaegsan-Hwanggangri mineralized zone were analyzed. Analytical results are as follows. The ore specimen of Sangdong mine contained 23% copper(cut-off grade=0.7%) and those of Cheongil and Samhwanghak mines contained average 5% zinc(cut-off grade=2.0%). Especially, the detailed investigation on the above-mentioned mines is required. And, in case of molybdenum(cut-off grade=0.02%) content in Yeonhwa No. 2(0.04%) and Hong-cheon mine(0.02%), and lead(cut-off grade=0.58%) content in Wongasa mine(0.70%), and gold(cut-off grade=10ppm) content in Dongmyoung(279ppm) and Samhwanghak mine(251ppm), it is required to elastically carry out the revaluation on reopening of mines in terms of the international metal price. On the other hand, in case of uranium, iron and tungsten, it is thought that there are no mines with the development potential value in this study.
Geochemical and Nd-Sr Isotope Studies for Foliated Granitoids and Mylonitized Gneisses from the Myeongho Area in Northeast Yecheon Shear Zone
Kim, Sung-Won ; Lee, Chang-Yun ; Ryu, In-Chang ;
Economic and Environmental Geology, volume 41, issue 3, 2008, Pages 299~314
The NE-trending Honam shear zone is a broad, dextral strike-slip fault zone between the southern margin of the Okcheon Belt and the Precambrian Yeongnam Massif in South Korea and is parallel to the trend of Sinian deformation that is conspicuous in Far East Asia. In this paper, we report geochemical and isotopic(Sr and Nd) data of mylonitic quartz-muscovite Precambrian gneisses and surrounding foliated hornblende-biotite granitoids near the Myeongho area in the Yecheon Shear Zone, a representative segment of the Honam Shear Zone. Foliated hornblende-biotite granitoids commonly plot in the granodiorite field(
discrimination diagram, whereas quartz-muscovite Precambrian orthogneisses plot in the granite field. The foliated hornblende-biotite granitoids are mostly calcic and calc-alkalic and are dominantly magnesian in a modified alkali-lime index(MALI) and Fe# [
diagrams, which correspond with geochemical characteristics of Cordilleran Mesozoic batholiths. The foliated hornblende-biotite granitoids have molar ratios of
ranging from 0.89 to 1.10 and are metaluminous to weakly peraluminous, indicating I type. In contrast, Paleoproterozoic orthogneisses have peraluminous compositions, with molar ratios of
ranging from 1.11 to 1.22. On trace element spider diagrams normalized to the primitive mantle, the large ion lithophile element(LILE) enrichments(Rb, Ba, Th and U) and negative Ta-Nb-P-Ti anomalies of foliated hornblende-biotite granitoids and mylonitized quartz-muscovite gneisses in the Yecheon Shear Zone are features common to subduction-related granitoids and are also found in granitoids from a crustal source derived from the arc crust of active continental margin.
and initial Sr-ratio ratios of foliated hornblende-biotite granitoids with suggest the involvement of upper crust-derived melts in granitoid petrogenesis. Foliated hornblende-biotite granitoids in the study area, together with the Yeongju Batholith, show not changing contents of specific elements(Ti, P, Zr, V and Y) from shear zone to the area near the shear zone. These results suggest that no volume changes and geochemical alterations in fluid-rich foliated hornblende-biotite granitoids may occur during deformation, which mass transfer by fluid flow into the shear zone is equal to the mass transfer out of the shear zone.
Source Identification for Asian Dust Deposited on Domestic Area Using Sr-Nd Isotope Ratios in Spring, 2007
Youm, Seung-Jun ; Lee, Pyeong-Koo ;
Economic and Environmental Geology, volume 41, issue 3, 2008, Pages 315~326
Recently, the occurrence and intensity of Asian Dust have dramatically increased in Korean peninsula, resulting in severe damages to the domestic social and economic field. The most useful way to prevent the damage of Asian Dust is the restraint of the occurrence of Asian Dust itself. However, Asian dust is the one of the natural phenomena, thus there is a basic limit to manage the Asian Dust. Though it is impossible to restrain the occurrence of Asian Dust in short time at present, it is a urgent matter to minimize the damage of Asian Dust. It is necessary to construct the basic data for understanding the harmfulness of Asian Dust, and to elucidate the source area of Asian Dust in connection with the maleficence of itself. In this study, the source area of Asian Dust in spring, 2007, is investigated using the Sr-Nd isotopic ratios which is the most common method to trace the source of geological materials. The relationships of Sr-Nd isotope ratios indicate that Asian Dust was originated from Central Loess Plateau and/or Ordos desert in spring, 2007.
Change of Chemical Properties and Nutrient Dynamic in Pore Water of Upland Soil During Flooding
Kim, Jae-Gon ; Chon, Chul-Min ; Lee, Jin-Soo ;
Economic and Environmental Geology, volume 41, issue 3, 2008, Pages 327~334
Understanding the chemical characteristics of sediments and the nutrient diffusion from sediments to the water body is important in the management of surface water quality. Changes in chemical properties and nutrient concentration of a submerged soil were monitored for 6 months using a microcosm with the thickness of 30cm for upland soil and 15cm of water thickness above the soil. The soil color changed from yellowish red to grey and an oxygenated layer was formed on the soil surface after 5 week flooding. The redox potential and the pH of the pore water in the microcosm decreased during the flooding. The nitrate concentration of the surface water was continuously increased up to
but its phosphate concentration decreased from
during flooding. However, the concentrations of
, Fe and Mn in the pore water were increased by the flooding during this period. The increased
in the surface water was due to the migration of
formed in the soil column and the oxidation to
in the surface water. The increased phosphate concentration in the pore water was due to the reductive dissolution of Fe-oxide and Mn-oxide, which scavenged phosphate from the soil solution. The oxygenated layer played a role blocking the migration of phosphate from the pore water to the water body.
Assessment of Acid Rock Drainage Production Potential and Damage Reduction Strategy: A Case Study of Tunnel Construction Area
Kim, Jae-Gon ; Lee, Jin-Soo ; Kim, Tong-Kwon ;
Economic and Environmental Geology, volume 41, issue 3, 2008, Pages 335~344
The acid rock drainage (ARD) production potential of rock was assessed for a tunnel construction area, Kimhae and the damage reduction strategy was discussed based on the ARD risk evaluation. The geology of the studied area consisted of Mesozoic quartz porphyry, sandstone, tuff and granite. Sulfides occurred as a disseminated type in quartz porphyry and granite, and a vein type in sandstone. Quartz porphyry and sandstone with a high content of sulfide were classified as a potentially ARD forming rock. The drainage originated from those rocks may acidify and contaminate the surrounding area during the tunnel construction. Therefore, the drainage should be treated before it is discharged. A slope stability problem due to the ARD was also expected and the coating technology was recommended for the reduction of ARD generation before the application of supplementary work for enhancing slope stability such as shotcrete and anchor. From the ARD risk analysis, those rocks should not be used as aggregate and be used as bank fill material with the system for the minimum contact with rain water and ground-water.
Mineral Economic Index and Comprehensive Demand Prediction for Strategic Minerals: Copper, Zinc, Lead, and Nickel
Choi, Soen-Gyu ; Kim, Chang-Seong ; Ko, Eun-Mi ; Kim, Seong-Yong ; Jo, Ho-Young ;
Economic and Environmental Geology, volume 41, issue 3, 2008, Pages 345~357
Korea has been one of the top ranked countries in the per capita and total consumption of Cu, Zn, Pb, and Ni since economic development based on manufacturing industries. The current instability of mineral demand and supply in Korea is likely to continue or exacerbate in accordance with economic growth in developing countries such as BRICs. Korea needs to increase the self-development portion of strategic mineral resources including Cu, Zn, Pb, and Ni. Our analysis of mineral demand and supply data predicts a long-run instability of supply and demand for main minerals used in the Korean manufacturing industries, and suggests a long range government policy for stable supply of core mineral resources.
A Study on Role Assignment between the Ministries of Government for the Research and Development on Disaster Prevention
Park, Jung-Han ; Choi, Gyu-Hyun ; Kim, Young-Soo ; Jung, Seong-Hoon ; Lee, Sang-Houck ; Lee, Pyeong-Koo ; Lee, Woan-Kyu ;
Economic and Environmental Geology, volume 41, issue 3, 2008, Pages 359~372
A number of researches on disaster risk reduction using the most advanced equipments and scientific technologies have been performed to minimize the damage of property and to protect human life. Although the Korean government is trying to enlarge the research area for disaster risk reduction, the investment size and the applicable results in this area have stayed in the lower level comparing to other scientific fields in Korea and the same field in advanced countries. However, the National Emergency Management Agency (NEMA), a government Agency which is responsible for disaster management coordination, was established in June 2004 establishing an efficient and well-organized system to cope with various disasters. In this study, investment size by the government was evaluated and associated areas were also identified. We also analyzed the roles on research and development for disaster risk reduction among different government Ministries were analyzed and role assignment to each Ministry was proposed. The role assignment has been concreted by conducting the process of approval in the government.
Review of the Characteristics of Keregetass Mineralized Zone in the Karaganda Oblast, Kazakhstan
Lee, Jae-Ho ; Kim, In-Joon ; Kim, Bok-Chul ;
Economic and Environmental Geology, volume 41, issue 3, 2008, Pages 373~382