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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 34, Issue 7 - Dec 2013
Volume 34, Issue 6 - Oct 2013
Volume 34, Issue 5 - Sep 2013
Volume 34, Issue 4 - Aug 2013
Volume 34, Issue 3 - Jun 2013
Volume 34, Issue 2 - Apr 2013
Volume 34, Issue 1 - Feb 2013
Selecting the target year
Distribution Pattern, Geochemical Composition, and Provenance of the Huksan Mud Belt Sediments in the Southeastern Yellow Sea
Ha, Hun Jun ; Chun, Seung Soo ; Chang, Tae Soo ;
Journal of the Korean earth science society, volume 34, issue 4, 2013, Pages 289~302
DOI : 10.5467/JKESS.2013.34.4.289
In order to determine the provenance of the Huksan Mud Belt sediments in the southeastern Yellow Sea, the major and rare earth elements of the same sediments were analyzed. The surface sediments were sampled from top of piston-cores and box-cores taken at 51 sites within the Huksan Mud Belt. With the mean grain size of
, the sediments of the study area are mud-dominated. The spatial distribution patterns show that silt content is high in the northern Mud Belt, whereas clay content increases as it moves toward the southern Mud Belt. Interestingly, the geochemical compositions both of major and rare earth elements have resulted in differences of sediment provenance. Among the major elements, plots of Fe/Al vs. Mg/Al ratios,
vs. MgO ratios, and
reveal that the Huksan Mud Belt sediments are dominated by the Korean river-derived sediments. However, the characteristics of rare earth elements infer sediments originating from the Chinese rivers. This discrepancy between the above provenances is attributed to the different contributory factors in the content of chemical elements. Considering strong correlation between major elements with grain sizes, the contents of the major elements are thought to be influenced by the grain size. However, there is a weak correlation between rare earth elements and grain sizes. The behaviour of rare earth elements may be controlled by heavy minerals, rather than grain sizes. Further study requires to solve the discrepancy arose from the difference in applied chemical tracers.
An Analysis of Model Bias Tendency in Forecast for the Interaction between Mid-latitude Trough and Movement Speed of Typhoon Sanba
Choi, Ki-Seon ; Wongsaming, Prapaporn ; Park, Sangwook ; Cha, Yu-Mi ; Lee, Woojeong ; Oh, Imyong ; Lee, Jae-Shin ; Jeong, Sang-Boo ; Kim, Dong-Jin ; Chang, Ki-Ho ; Kim, Jiyoung ; Yoon, Wang-Sun ; Lee, Jong-Ho ;
Journal of the Korean earth science society, volume 34, issue 4, 2013, Pages 303~312
DOI : 10.5467/JKESS.2013.34.4.303
Typhoon Sanba was selected for describing the Korea Meteorological Administration (KMA) Global Data Assimilation Prediction System (GDAPS) model bias tendency in forecast for the interaction between mid-latitude trough and movement speed of typhoon. We used the KMA GDAPS analyses and forecasts initiated 00 UTC 15 September 2012 from the historical typhoon record using Typhoon Analysis and Prediction System (TAPS) and Combined Meteorological Information System-3 (COMIS-3). Sea level pressure fields illustrated a development of the low level mid-latitude cyclogenesis in relation to Jet Maximum at 500 hPa. The study found that after Sanba entered the mid-latitude domain, its movement speed was forecast to be accelerated. Typically, Snaba interacted with mid-latitude westerlies at the front of mid-latitude trough. This event occurred when the Sanba was nearing recurvature at 00 and 06 UTC 17 September. The KMA GDAPS sea level pressure forecasts provided the low level mid-latitude cyclone that was weaker than what it actually analyzed in field. As a result, the mid-latitude circulations affecting on Sanba's movement speed was slower than what the KMA GDAPS actually analyzed in field. It was found that these circulations occurred due to the weak mid-tropospheric jet maximum at the 500 hPa. In conclusion, the KMA GDAPS forecast tends to slow a bias of slow movement speed when Sanba interacted with the mid-latitude trough.
Geochemical Characteristics of the Uljin Granitoids in Northeastern Part of the Yeongnam Massif, Korea
Wee, SooMeen ; Kim, Ji-Young ; Lim, Sung-Man ;
Journal of the Korean earth science society, volume 34, issue 4, 2013, Pages 313~328
DOI : 10.5467/JKESS.2013.34.4.313
Jurassic granitoids in the northeastern part of the Yeongnam Massif are possibly the result of intensive magmatic activities that occurred in response to subduction of the proto-Pacific plate beneath the northeast portion of the Eurasian plate. Geochemical studies on the granitic rocks are carried out in order to constrain the petrogenesis of the granitic magma and to establish the paleotectonic environment of the area. Whole rock chemical data of the Uljin granitoids in the northeastern part of the Yeongnam Massif indicate that all of the rocks have the characteristics of calcalkaline series in subalkaline field. The overall major element trends show systematic variations in each granitic body, but the source materials of each granitoids seem to have different chemical composition. The Uljin granitoids are different from other granitic rocks, which distributed vicinity of the study area, in the contents of
and trace elements such as Cr, Co, Ni, Sr, Y and Nb. The Uljin granitoids have geochemical features similar to slab-derived adakites such as high
, Sr contents and high Sr/Y, La/Yb ratios, but they have low Y and Yb contents. The major (
, MgO) and trace element (Sr, Y, La, Yb) contents of the Uljin granitoids fall well within the adakitic field. The Uljin granitoids have similar geochemical characteristics, paleotectonic environments and intrusion ages to those of the Yatsuo plutonic rocks of Hida belt located on northwestern part of Japan. Chondrite normalized REE patterns show generally enriched LREEs (
) and are slight negative to flat Eu anomalies. On the ANK vs. A/CNK and tectonic discrimination diagrams, parental magma type of the granites corresponds to I-type and volcanic arc granite (VAG). Interpretations of the chemical characteristics of the granitic rocks favor their emplacement in a compressional tectonic regime at the continental margin during the subduction of Izanagi plate in Jurassic period.
K-Ar Ages for Mesozoic Volcanic Rocks in the Geumdang Island, Jeonam, Korea
Kim, Myung-Gee ; Kang, Ji-Won ; Kim, Cheong-Bin ;
Journal of the Korean earth science society, volume 34, issue 4, 2013, Pages 329~335
DOI : 10.5467/JKESS.2013.34.4.329
Based on mineral assemblages, field occurrences, the volcanic rocks distributed in the Geumdang Island area are divided into three types: rhyolite, porphyritic rhyolite and intermediated dyke rock. In a diagram of [TAS (total alkali-silica)], rhyolites and porphyritic rhyolites belong to the rhyolite-dacite field and rhyolite field, respectively. As to the times when the rhyolite and porphyritic rhyolite rocks were formed a whole rock K-Ar age was obtained. These absolute age determinations have revealed that the former (rhyolite) has an age of 76-78 Ma and belongs to the Late Cretaceous (Campanian) and the latter (porphyritic rhyolite) is 71-72 Ma in age and thus belongs to the boundary between the Campanian and Maastrichtian. These geological ages are associated with the igneous activity of the Yuchon Group which occurred vigorously in the southern part of the Korean peninsula during the Late Cretaceous. The various geological ages of volcanic rocks distributed in the southwestern part of the peninsula and of igneous rocks found in the Cretaceous formation which contain a wide variety of minerals indicate that in this area, volcanic activities continued vigorously as a result of the collision of the Eurasian and Pacific Plates between 108-71 Ma.
Multiple Linear Regression Model for Prediction of Summer Tropical Cyclone Genesis Frequency over the Western North Pacific
Choi, Ki-Seon ; Cha, Yu-Mi ; Chang, Ki-Ho ; Lee, Jong-Ho ;
Journal of the Korean earth science society, volume 34, issue 4, 2013, Pages 336~344
DOI : 10.5467/JKESS.2013.34.4.336
This study has developed a multiple linear regression model (MLRM) for the seasonal prediction of the summer tropical cyclone genesis frequency (TCGF) over the western North Pacific (WNP) using the four teleconnection patterns. These patterns are representative of the Siberian high Oscillation (SHO) in the East Asian continent, the North Pacific Oscillation (NPO) in the North Pacific, Antarctic oscillation (AAO) near Australia, and the circulation in the equatorial central Pacific during the boreal spring (April-May). This statistical model is verified by analyzing the differences hindcasted for the high and low TCGF years. The high TCGF years are characterized by the following anomalous features: four anomalous teleconnection patterns such as anticyclonic circulation (positive SHO phase) in the East Asian continent, pressure pattern like north-high and south-low in the North Pacific, and cyclonic circulation (positive AAO phase) near Australia, and cyclonic circulation in the Nino3.4 region were strengthened during the period from boreal spring to boreal summer. Thus, anomalous trade winds in the tropical western Pacific (TWP) were weakened by anomalous cyclonic circulations that located in the subtropical western Pacific (SWP) in both hemispheres. Consequently, this spatial distribution of anomalous pressure pattern suppressed convection in the TWP, strengthened convection in the SWP instead.
The Effects of Flash Panorama-based Virtual Field Trips on Students' Spatial Visualization Ability and Their Understanding of Volcanic Concept in High School Earth Science Class
Heo, Jun-Hyuk ; Lee, Ki-Young ;
Journal of the Korean earth science society, volume 34, issue 4, 2013, Pages 345~355
DOI : 10.5467/JKESS.2013.34.4.345
While virtual field trips (VFT) are considered as an attractive alternative to traditional field experience, it is unclear how VFT are best used in Earth Science curriculum. In this study, we investigated the effects of flash panorama-based VFT on students' spatial visualization ability and their understanding of volcanic concept in high school Earth Science class. To investigate the effects of instructional treatment, we conducted pre and post-test on participants' spatial visualization ability and their understanding of volcanic concept, and analyzed using analysis of covariance (ANCOVA) and linear regression. Findings are as follows: First, the change in students' spatial visualization ability in experimental group was significantly higher than that of control group, especially in spatial manipulation category. Second, the change in students' understanding of volcanic concept in experimental group was higher than that of control group in most of the categories, but it is statistically not significant. Last, the change in correlation between spatial visualization ability and understanding of volcanic concept in experimental group was remarkably high compared to control group.
Study on the Conceptual Hierarchy for Seasonal Change
Jung, Sun-La ; Lee, Yong Bok ;
Journal of the Korean earth science society, volume 34, issue 4, 2013, Pages 356~367
DOI : 10.5467/JKESS.2013.34.4.356
We study on the concept and reason of seasonal change that 164 university students have. Subsequently the concept types on the seasonal change are classified according to the characteristics and conceptual change after teaching on astronomy. All of the students were simply checked by the questionnaire of multiple choice and essay method before learning on the subjects. And then they answered to questionnaires of similar type after one semester. By the analyzed results, we classify it to three steps of hierarchical concept structure. The first step is the cosmic perspective that is related to the Earth's condition and motion. The second step is the influence of the Earth that is directly affected by the first step. The third step is observer's perspective on the Earth depending on the second step. Among the answers, the first step is prominent and second step is rare. The answers on the reason of seasonal change show some kinds of type which are 1st, 1-2nd, 1-3rd, and 1-2-3rd step. By the result, it is arranged in sequence like as 1-3rd>1st>1-2nd>1-2-3rd type. The lowest number of students was 2nd step of the Sun's altitude and duration of daytime in pre-test. However the students of 2nd step obtained more correct scientific concept on the seasonal change after learning on the subjects, and got the higher score in the post-test than in the pre-test. We found how much important the hierarchical structure on the reason of seasonal change is. As the results, second step on the learning of the Sun's altitude and duration of daytime essentially have to teach after first step. And then third step have to teach. At last, it is sure that the students can obtain the concept of seasonal change.
Ways of Restructuring Key Competencies for a Revision of Science Curriculum
Kwak, Youngsun ;
Journal of the Korean earth science society, volume 34, issue 4, 2013, Pages 368~377
DOI : 10.5467/JKESS.2013.34.4.368
The purpose of this research was to investigate ways of restructuring key competencies (KCs) in preparation for a revision of Korean science curriculum. Recently a number of countries have reformed their curricular using competencies as a key element because they believe that competencies-based curriculum helps students build up the necessary skills to live in the future society. Through literature reviews, in-depth interviews with experts and teachers, expert meetings, Delphi methods, and surveys with teachers, three major categories of KCs emerged as follows: Character competencies, Intellectual competencies, and Social competencies. For each major category, its definition, characteristics and teachers' comments are discussed. The specific components of KCs for each major category and implementing KCs should be determined at the subject- and teacher-level based on teacher professionalism. In the conclusion section, we suggested a couple of important points that deserve readers' attention when we reconstruct science curriculum by incorporating three major categories of KCs. When we develop a science curriculum in the future, we need to include three major categories of KCs, and set up KCs as a minimum set of goals for all students. We need to remember that specific components of KCs for each major category and linkage among KCs may vary depending on science topics and objectives.