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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 29, Issue 7 - Dec 2008
Volume 29, Issue 6 - Oct 2008
Volume 29, Issue 5 - Sep 2008
Volume 29, Issue 4 - Aug 2008
Volume 29, Issue 3 - Jun 2008
Volume 29, Issue 2 - Apr 2008
Volume 29, Issue 1 - Feb 2008
Selecting the target year
The Effects on the Traditional Processing Operation of Hematite Medicinal Mineral through Heating and Quenching in Vinegar
Hwang, Jeong ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 523~530
DOI : 10.5467/JKESS.2008.29.7.523
The phase changes and variations of elemental contents in hematite medicinal mineral were investigated by a traditional processing operation including heating and quenching in vinegar. Hematite was processed at
through at least 5 processing cycles. Metal extraction tests in water were carried out with the processed hematite. Heating and quenching in vinegar could not change the phase of hematite. The effect of this traditional method was not clear because there were no variational trends between extracted elements and the number of processing cycles at
. However, the traditional processing operation of heating and quenching in vinegar was very effective to change the hematite mineral towards soft and easily crushing medicinal material.
The Mode of Occurrence and Composing Minerals of Petrified Woods from the Tertiary Janggi Group of Pohang Basin in Korea
Kim, Jong-Heon ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 531~538
DOI : 10.5467/JKESS.2008.29.7.531
The mode of occurrence of petrified woods from the Tertiary strata of Pohang Basin in Kyeongsangbug-do suggests that the petrified woods are all allochthonous fossils. Petrified woods as well as various types of wood fossils such as carbonized woods and charcoal woods were found. However, some lignified organic remains are rarely found in the bark part of petrified woods. X-ray diffraction analysis showed three types of minerals including Opal-CT, Opal-C, and quartz+cristobalite. The presence of these minerals indicates that silicification occurred under the low temperature. The tuffs are considered to be main source of supply of silica. Analysis of the kind of composing minerals and the condition of tissue preservation can predict that silicification is mainly occurred by replacement.
Geochemistry, Isotope Properties and U-Pb Sphene Age of the Jeongeup Foliated Granite, Korea
Jeong, Youn-Joong ; Cheong, Chang-Sik ; Park, Cheon-Young ; Shin, In-Hyun ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 539~550
DOI : 10.5467/JKESS.2008.29.7.539
In this paper, we investigate the geochemical and isotope properties of the Jeongeup foliated granite (hereafter, the JFG) in the Jeongeup area, aiming at establishing the movement age of the Honam shear zone by U-Pb sphene geochronology. In the AMF diagram, the JFG corresponds to the calc alkalic rock series, and belongs to the magnesia region in the diagram of silica versus
. Additionally, in the Rb-Ba-Sr diagram, it is classified as granodiorite and anomalous granite with distinctive negative Eu-anomaly in the REE patterns. According to the silica and trace element contents, the JFG falls on the type VAG+syn-COLG, which implies that this was formed under the circumstance of compressional continental margin or volcanic arc.
isotope ratios range from 0.511495 to 0.511783 and
are calculated to be about
. U-Pb sphene ages of the JFG are
, based on
ages, respectively. Presumably, the dextral ductile shearing in the Jeongeup area has occurred after 173 Ma.
Chalcopyrite Disease in Sphalerite: A Case of the Soowang Ore Deposits in Muju, Republic of Korea
Youn, Seok-Tai ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 551~558
DOI : 10.5467/JKESS.2008.29.7.551
The Soowang deposits occur in the quartz veins that were filled fissures in the middle Cretaceous porphyritic granite and/or the Precambrian Sobaegsan gneiss complex. Paragenetic studies suggest that the vein filling can be divided into four identifiable stages. Sphalerites were deposited by the cooling fluids at stages I, II, and III. The results of microscopic observation and EPMA analysis suggest that the chalcopyrite dots and disease in sphalerite are replacement products by later hydrothermal solution at the early stage III. The inferred processes of chalcopyrite disease are as follows: (1) Fe enrichment to the margins and along the cracks of the Fe-poor sphalerite by Fe-rich solution, (2) Formation of chalcopyrite dots in the Fe-enriched sphalerite formed at the stage II, and Fe reduction of sphalerite near the chalcopyrite dots by Cu-bearing solution, (3) Formation of "chalcopyrite disease" penetrating the compositional zoning of sphalerite at the early stage III.
Large Ground Motion Related to Crustal Structure in Korea
Kim, Kwang-Hee ; Kang, Su-Young ; Min, Dong-Joo ; Suk, Bong-Chool ; Ryoo, Yong-Gyu ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 559~566
DOI : 10.5467/JKESS.2008.29.7.559
Ground shaking recorded during the January 20, 2007,
4.8 Odaesan earthquake (Korea) were used to investigate the role of the crustal structure in producing a strong ground motion, which includes the identification of the phases responsible for the strong ground motion and their implications for seismic hazard assessment. Analyses of strong-motion data together with waveform simulation revealed that critical and post-critical reflections from the crust-mantle boundary are responsible for the abnormal ground motions. This result demonstrates that the crustal structure should be taken into consideration in studies of seismic hazard mitigation even in the areas of relatively low seismicity.
A Review on the Decision-making Process for Extratropical Transition of Typhoon from an Operational Forecast Point of View
Cha, Eun-Jeong ; Shim, Jae-Kwan ; Kwon, H.Joe ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 567~578
DOI : 10.5467/JKESS.2008.29.7.567
The extratropically transitioning cyclones have been shown to have a large effect on weather system in the midlatitues and cause sometimes the severe weather phenomena. However, both operational forecasting and research aspect of ET remain a significant challenge. Because it is difficult to distinguish ET stage due to obscure configuration of the cyclone itself. Furthermore, any definition of ET should not only be precise enough to satisfy the needs of the operational and research communities. Therefore, the "operational deterministic process for ET" was proposed and has been used to diagnose both structure and subsequent process of ET in 2007. In this study, it has been examined the maximum wind and SST in the 1st step, satellite image in the 2nd step, sounding in the 3rd step, surface weather chart analysis in the final step. This operational manual has allowed better monitoring and understanding of the changes in the structure as ET occurs.
Time-dependent Evolution of Accretion Disk Mass in a Black Hole Microquasar Candidate A0620-00
Kim, Soon-Wook ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 579~585
DOI : 10.5467/JKESS.2008.29.7.579
The time-dependent evolution of disk mass for outburst limit cycle in a black hole microquasar is calculated based on the non-linear hydrodynamic model of thermally unstable accretion disk. The physical parameters such as black hole mass, disk size and mass transfer rate are adopted to reproduce the historical 1975 outburst observed in a prototype black hole X-ray nova A0620-00. The time-dependent effect of irradiation from the central hot region to the disk is considered in two ways: direct irradiation and indirect irradiation reflected from hot accretion flow above the disk. The accretion disk thermal instability model can account for the bolometric luminosity appropriate to typical characteristics of system luminosity observed in X-ray transients during the whole cycle of the outburst evolution. The maximum mass of the accretion disk,
, is achieved at the ignition of an outburst, and the minimum value,
, is reached during the cooling decay to quiescence. The disk mass varies
times during outburst limit cycle.
The Development of the Analytic Coding Frames on the Abductive Reasoning in Scientific Inquiry
Cho, Hyun-Jun ; Jeong, Sun-Hee ; Yang, Il-Ho ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 586~601
DOI : 10.5467/JKESS.2008.29.7.586
The purpose of this study was to identify the scientists' abductive reasoning in three stages of hypothetical-deductive inquiry process; generating hypothesis, designing, and interpreting data and to suggest new analytic coding frames on abductive reasoning in each of the stages. For this purpose, the interview protocols collected through in-depth interviews with eight scientists were analyzed by the early frame with sub-elements derived from the literature reviews. The need of a new frame of analysis beyond the previously established elements arose from the result of this analysis because the processes of abductive reasoning were found in all three stages. Based on scientists' interview data, this study then designed a new frame of analytic coding frames on the abductive reasoning in each of the stages. The content validity index from four experts was 0.90, and these frames showed a good fit to analyze the scientists' real process of abduction in three stages of hypothetical-deductive inquiry process.
The Influence of Global Science Literacy-Oriented Instruction on Students' Views of the Nature of Science
Yu, Eun-Jeong ; Oh, Hyun-Seok ; Kim, Chan-Jong ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 602~616
DOI : 10.5467/JKESS.2008.29.7.602
The purpose of this study is to investigate the influence of global science literacy-oriented instruction on students' views of the nature of science. The participants were 65 male students in 8th grade, and they were taught for five weeks about the Unit of "Earth and Star" that was designed based on global science literacy. Survey was conducted to determine the students' views of the nature of science before and after the instruction. Results revealed that it was hard to change students' views of the nature of science during the short period of time; however, in the sociological aspect, the students acquired relatively more improved students' views of the nature of science than the other aspects including philosophical, psychological, and historical aspects.
The Effect of High School Earth Science Instruction Using Mind Map
Kim, Sang-Dal ; Kim, Eun-Jung ; Ju, Cook-Young ; Choi, Sung-Bong ; Hong, Dong-Gyoon ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 617~625
DOI : 10.5467/JKESS.2008.29.7.617
The purpose of this study was to identify the effect that using mind map instruction has on the students' scientific inquiry skill and science-related attitudes in 11th grade in the earth science instruction. The objects of this study were consisted of two classes with 11th graders at K public high school in Kimhea city. The experimental group using mind map was lessoned 2 hours a week for 10 weeks. On the other hand, the controlled group was traditionally taught. Each group was consisted of 34 students. Student's science inquiry skills and science-related attitudes were assessed in pre-test, and then each group was instructed. The post-test was conducted after the instruction. Findings were as follows: First, As for the scientific inquiry skill, the result revealed that there was a statistically significant difference between the two groups. This finding means that the mind map instruction was more effectiveto improve students' scientific inquiry skills. Second, Regarding the science-related attitudes, the t-test analysis showed that there was a statistically significant difference between the two groups. This result implies that the mind map instruction was more effective in promoting students' attitudes toward science. In conclusion, the earth science instruction using mind map showed more effectiveness on the high school students' improvement of their science inquiry skills and science-related attitudes.
A Comparative Analysis on Inquiry Activities in Geology of High School Earth Science Textbooks of Korea and the U.S.
Bae, Hyun-Kyung ; Chung, Gong-Soo ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 626~639
DOI : 10.5467/JKESS.2008.29.7.626
To present the suggestions for improvement in science textbooks of high school, scientific inquiry activities in geology of earth science textbooks of Korea and the U.S. were assessed in the areas of the contents, processes and contexts. Regarding the contents of inquiry activities, Korean textbooks contain more number of inquiry activities (5.8 per section) than the U.S. curriculums (4 per section). Inquiry activities of Korean textbooks mostly fall on the interpretation of diagrams and graphs whereas those of the U.S. textbooks more hands-on experiment, data transformation and self designing. As for the number of inquiry process skills per inquiry activity, Korean curriculums contain an average of 1.8 whereas the American ones 3. It suggests that the U.S. textbooks require more integrated process skills than the Korean earth science curriculums. In the process skills of all textbooks studied, the highest frequent elements were inferring and data interpretation; the percentage of these two elements was an average of 73.3% in Korean textbooks and 46.2% in the U.S. This suggests that the Korean textbooks emphasize the process skill on particular area, and uneven distribution of elements of process skills may hinder the development of integration ability of students. particularly in the integrated process skills, the U.S. textbooks presented all 7 elements, while Korean ones presented only 2 to 4 elements, indicating that the Korean textbooks may have weak points in providing various inquiry activities for students compared to the American textbooks. In inquiry context analysis, Korean curriculums provide simplistic inquiry contexts and low applicability to real life whereas the U.S. curriculums provide more integrated inquiry contexts and high applicability to real life.
Type and Origin of The Domestic Leading Feldspar mines: Jecheon and Buyeo mine
Lee, Han-Yeang ;
Journal of the Korean earth science society, volume 29, issue 7, 2008, Pages 640~644
DOI : 10.5467/JKESS.2008.29.7.640
A type and origin of Buyeo and Jecheon mine as the domestic leading feldspar mines are classified by using the petrological characteristics. Jecheon mine is a weathered residual mine formed by the weathering of K-feldspar megacryst bearing porphyritic granite of which forming P-T is 840-5 Kb with the igneous origin of megacryst. On the other hand, Buyeo mine is made by the metasomatic alteration of hydrothermal solution from the biotite granite intrusion. Pure albite as a main ore mineral and garnet and sericite as accessaries are observed in this mine. In addition, the mine is typically characterized by the well recrystallized mineral texture.