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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
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Volume & Issues
Volume 37, Issue 6 - Dec 2004
Volume 37, Issue 5 - Oct 2004
Volume 37, Issue 4 - Aug 2004
Volume 37, Issue 3 - Jun 2004
Volume 37, Issue 2 - Apr 2004
Volume 37, Issue 1 - Feb 2004
Selecting the target year
The Present of State of the Metal and Gold Deposits, Indonesia
Economic and Environmental Geology, volume 37, issue 3, 2004, Pages 269~276
The Indonesian Archipelago is located in the southern tip of the Eurasian plate. The diverse subduction system of the Indonesia region records interactions between three megaplates (Eurasian, Indian-Australian, and Pacific plates) and many smaller plates. The geology of Indonesian Archipelago is characterized by many factors such as subduction zone complexes, magmatic arc rocks associated with plate tectonics, the arc granite and volcanic rocks, and the related metamorphic rocks. The base-metal deposits of Indonesia have a great effect on petrochemical character of parent rocks and geotectonic environments. The base-metal deposits can be classified into four types as hosted by felsic-intermediate intrusive rocks, hosted by ultramafic rocks, hosted by volcanic rocks, and hosted by sedimentary rocks. The gold deposits are divided into three types: epithermal gold deposits, porphyry copper associated gold deposits, and alluvial gold deposits. Especially, Indonesian island uc, with its numerous plates tectonic, has an high potential for epithermal gold deposits. Indonesia with many old and present subduction zones and sub-aerial calcalkaline volcanic rocks is a very promising country for epithermal gold mineralization.
The Trench Exploration of the Gold Deposits of the Tanggung Area of Java, Indonesia
Economic and Environmental Geology, volume 37, issue 3, 2004, Pages 277~290
The trench exploration was carried out on the quartz veins of the Tanggung area of Java, Indonesia. The chemical values of quartz vein samples for hydrothermal alteration zones in this area are defined such as over values of Ag : 2∼190ppm(Celak); 2∼41 ppm(Cilangkap), Au : 21∼17,400 ppb(Celak); 24∼91,100 ppb(Cilangkap), Cu : 9∼3,340 ppm(Celak); 2∼l,600 ppm(Cilangkap), Pb : 60∼52,900 ppm(Celak); 16∼2,960 ppm(Cilangkap), Zn : 12∼13,950 ppm(Celak); 14∼1,520 ppm(Cilangkap), respectively. Two drilling areas, Mt. Subang area(Celak area) and Mt. Cilangkap area(Cilangkap area), have been chosen based on the factors such as, geologic settings associated with gold mineralizations, highly anomalous areas revealed by geochemical survey such as chemical analysis of ore and soil, trench exploration, statistical processing of the chemical analysis, and petrographic studies of igneous rocks related to its mineralization, and graphic presentation of anomalous areas.
The Oxidation of Chalcopyrite and Geochemical Behavior of Heavy Metals in the Manjang Cu Mine
Economic and Environmental Geology, volume 37, issue 3, 2004, Pages 291~301
In order to charaterize weathering of chalcopyrite and behavior of dissolved metal ions in waste rocks from Manjang Cu mine, mineralogical studies such as refractive microscope, XRD and SEM/EDS analyses carried out. The weathering was mainly occurred in fractures and edge of the chalcopyrite within the mine waste rocks. The weathering process can be seen to reflect four stages based on the weathering degree of chalcopyrite. The main secondary minerals are goethite, covellite, azurite, malachite and brochantite. Dissolved Cu and As were mainly adsorbed Fe-hydroxide. Poorly crystalline Fe-oxide contains relatively high As contents. In oxdizing condition, the weathering of chalcopyrite mainly occurs along the fracture, while the replacement of chalcopyrite observed mainly in the grain and produced covellite and brochantite. The dissolved metals (Cu, Fe, As) in waste rocks from the abandoned Manjang mine area could attenuate naturally by precipitation, adsorption and replacement reaction.
Study on Synthesis of Pyrochlore in Gd-Ti-O and Gd-Zr-O Systems
Economic and Environmental Geology, volume 37, issue 3, 2004, Pages 303~309
Pyrochlores were known as promising materials for the immobilization of radioactive actinide. Accordingly, we synthesized pyrochlores with Gd
compositions by sintering method, and studied its properties and phase relations in Gd-Ti-O and Gd-Zr-O system. The mixed powders were pressed into pellets under 200-400 kgf/cm
at room temperature. and then sintered at 1000-1
for 0.5-40 hours. The synthesized samples were analyzed and were identified with XRD and SEM/EDS analyses. The optimal synthetic conditions of pyrochlores with Gd
composition were at 140
/3hrs and 120
/20hrs. Its chemical composition was
and similar to the stoichiometric composition without any relationship in temperature and atmosphere. The optimal synthetic conditions of pyrochlores with
composition were at 155
/40hrs and 1
/30hrs. The compositions of pyrochlore synthesized from these optimal conditions were irregular with
. Such heterogeneity indicates that the reaction rate of pyrochlore with Gd
composition is very low, and then its equilibrium state could not be attained even for 40 hours which was the longest sintering time in this research.
Contamination Level and Behavior of Heavy Metals in Stream Sediments Within the Watershed of Juam Reservoir
Economic and Environmental Geology, volume 37, issue 3, 2004, Pages 311~324
We investigated the contamination and behavior of heavy metals in stream sediments within the watershed of Juam Reservoir. Many abandoned mines within the reservoir can act as a potential contaminant source for water quality. Heavy metal concentrations (Cr, Cu, Ni, Pb and Zn) in stream sediments from watershed are very low, indicating that content of heavy metals in the sediments probably do not affect the water quality in Juam Reservoir. However Pb concentration in the stream sediments increases downward streams, suggesting the possible diffusion of Pb contamination. According to the leaching ratio for stream sediments at a strong acidic condition in the abandoned mine areas, the relative mobility for metals decreases in the order of Pb＞Zn=Cu＞Ni＞Cr, indicating that Pb can have a bad effect upon the water quality in Jum Reservoir. Moreover, if contaminated sediment is placed in the bottom of reservoir (i.e., reducing condition), the relative mobility of Pb is the highest, indicating that Pb in the bottom sediments can be leached to water at interface between water and sediment with changing in physicochemical conditions.
Paleomagnetic and Soil Chemical Studies on the Quaternary Paleosol Around the Hantan River
Economic and Environmental Geology, volume 37, issue 3, 2004, Pages 325~334
Detail downward variation records for paleomagnetic, XRD, photospectrogram, TOC results were obtained from the soil developed along the Hantan River, Gungpyeong-ri, Cheongsan-myeon, Yeoncheon-gun Gyeonggi-do. The unconsoildated sediments underlain by the Jeongok Quaternary Basalt indicates that the paleosol formed twice with different ages, as apparently indicated by sedimentological, paleomagnatic, and soil chemical properties. The paleosols recorded paleoclimate and paleoenvironments of about 271.21
89.8 ka before eruption of the Quaternary Jeongok Basalt.
Heavy Metals in Sediments and Organisms from Tidal Flats along the Mokpo Coastal Area
Economic and Environmental Geology, volume 37, issue 3, 2004, Pages 335~345
Total and extractable contents of heavy metals were measured in sediment and seafood from Bukhang and Boggil-ri tidal flats along the Mokpo coastal area, south-western part of Korean peninsular in order to assess the degree of metal pollution, metal bioavailability and metal hioaccumulation. The metal concentrations, except Pb were found to be greater than the background concentrations of sediments indicating the progress of cumulative contamination by anthropogenic origin of metals. The order of extractable metal concentrations in sediments were Mn(32-53 mg/kg)＞Zn(14-42 mg/tg)＞Cu(2.5-17.0 mg/kg)＞Pb(2.4-6.8 mg/kg)＞Cd(0.5-0.7 mg/kg). However, the amount of metals associated with extractable fraction of sediments were significantly high in Bukhang relative to Boggil-ri. Significant bioaccumulation of all metals, except Pb were observed in seaweed and benthos. The order of bioaccumulation of metals were: in concentration; all biota commonly, Mn(129-374 mg/kg)＞Zn(19-106 mg/kg)＞Cu(6-87 mg/kg)＞Cd(4.6-7.6 mg/kg)＞Pb(0.2-3.7 mg/kg), in BCF; Enteromorpha, Cd＞Mn＞Cu＞Zn＞Pb, Ilyoplax deschampsi, Cu＞Cd＞Mn＞Zn＞Pb, Urechis unicinctus, Cd＞Zn＞Mn＞Cu＞Pb. Some metal concentrations of Enteromorpha, especially Cu, Zn, weakly Pb in bukhang, Mn, Cd in boggili-ri, were correlate well with concentrations in sediment, indicating relatively more contaminated by the anthropogenic origin of metals in each tidal flat. The results clearly indicate that the seafood of bukhang, even of Boggili-ri known as clean area, are contaminated with metals.
Petrology of Rhyolitic Tuffites Around Wolseong Area, Southeast Korea
Economic and Environmental Geology, volume 37, issue 3, 2004, Pages 347~354
We report the petrographic and petrochemical results on the rocks which have been classified as hornfelsic sandstones or mudstones of the Gyeongsang Group in Wolseong Area, part of Choyang Geologic Sheet (Tateiwa, 1924) and discuss its origin. The rocks consist of alternating layers with dark. fine-grained and bright, coarse-grained but don't have any clues of thermal alteration such as hornfels. The rocks are composed of quartz, feldspar and rock fragments of volcanic origin. The overall geochemical characteristics of the rocks indicate that the rocks have mainly rhyolitic composition with 64.5-72 wt% SiO
and are similar to the trend of Cretaceous and Tertiary volcanic rocks around this area. On the contrary, the geochemical characteristics of rocks are distinguished from those of Lower Cretaceous Sindong and Mayans mudrocks in the Gyeongsang Basin. We re-name the rocks as rhyolitic tuffite.
Classification of Weathering for the Granite and Granite Gneiss in Okcheon Belt-Jecheon
Gimcheon in Korea
Economic and Environmental Geology, volume 37, issue 3, 2004, Pages 355~364
A study on the weathering grade classification has been performed for granite and granite gneiss in Korea. The qualitative classification criteria of weathering were reviewed and then modified with field studies for the weathered rock masses. The thin section observations and XRD analyses for the different weathering grades rock samples showed the petrographical and petrophysical difference with respect to the weathering : the proportion of weathering-resistant minerals suck at quartz and orthoclase has a tendency to increase with the development of weathering, but that of weathering-sensible minerals such as anorthite and biotite is decreased. The ranges of physical and mechanical rock properties for different weathering grades were obtained from the laboratory rock tests and field tests for the studied rocks. And then, along with
(Fookes et al., 1988), the weathering index
, (Woo, 2003) has been developed in this study to demarcate the weathering grade. Those two indices rely mainly on the water absorption ratio of rock and on the different rock strength. The range of these weathering indices have been determined with the physical and mechanical rock properties that can be obtained from simple field or laboratory tests in 4 grades
＞ 7 for F, 3.5 ＜
＜ 10 for SW, 1.0
＜ 6.0 for MW and
＜ 2.5 for HW. Consequently, the weathering index could be utilized to classify quantitatively the rock weathering grade, especially for the studied granites and the granite gneiss in Korea.
An Analysis on the Employment Status of KOSEF′s Research Internship Awardees in Earth Sciences
Economic and Environmental Geology, volume 37, issue 3, 2004, Pages 365~373
This survey was conducted on KOSEF's research internship awardees (FY 1998 to 2001) in order to investigate the employment status of doctoral and master's degree holders in Geosciences in Korea. An unemployment rate of KOSEF's research internship awardees (FY 1998 to 2001) was 32.0 percent for the doctoral and master's degree holders in Geosciences. 37.2 percent of employed doctoral and master's degree holders only obtained employment as a full-time and part-time status in industry, research institutions and academia in Korea. The U.S. Census Bureau conducted the 2001 survey of doctoral recipients (SDR). Based on this survey, most U.S. doctoral holders were employed and an unemployment rate for 2001 was only 1.3 percent of the Geosciences doctoral holders. KOSEF or related academic societies should be able to provide a more precise information of the employment status for new doctoral and master's degree holders in Geosciences by conducting the survey of doctoral and master's degree recipients. The results of this survey will be used to understand and to predict trends in employment opportunities in Geosciences for doctoral and master's degree holders.