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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of the Petrological Society of Korea
Journal Basic Information
Journal DOI :
Petrological Society of Korea
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Volume & Issues
Volume 23, Issue 4 - Dec 2014
Volume 23, Issue 3 - Sep 2014
Volume 23, Issue 2 - Jun 2014
Volume 23, Issue 1 - Mar 2014
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Review on the Triassic Post-collisional Magmatism in the Qinling Collision Belt
Oh, Chang Whan ; Lee, Byung Choon ; Yi, Sang-Bong ; Zhang, Cheng Li ;
The Journal of the Petrological Society of Korea, volume 23, issue 4, 2014, Pages 293~309
DOI : 10.7854/JPSK.2014.23.4.293
The Qinling-Dabie-Sulu-Hongseong-Odesan collision belt was formed by the collision between the North China and South China Cratons during late Permian to Triassic. During the collision, Triassic post-collision igneous rocks regionally intruded in the Qinling and the Hongseong-Odesan collision belts which represent the western and eastern ends of the collision belt, respectively. However, no and minor Triassic post-collision igneous activities occur in the Dabie and Sulu belts respectively. The peak metamorphic pressure conditions along the Qinling-Dabie-Sulu-Hongseong-Odesan belt indicate that the slab break-off occurred at the depth of ultra-high pressure (UHP) metamorphic condition in the Dabie and Sulu belts and at the depths of high pressure (HP) or high pressure granulite (HPG) metamorphic condition in the Qinling and Hongseong-Odesan belts. In the Dabie and Sulu belts the heat supply from the asthenospheric mantle through the gab formed by slab break-off could not cause an extensive melting in the lower continental crust and lithospheric mantle directly below it due to the very deep depth of slab break-off. On the other hand, in the Qinling and Hongseong-Odesan belts, shallower slab break-off caused the emplacement of regional post collision igneous rocks. The post-collision igneous rocks occur in the area to the north of the Mianlu Suture zone in the western Qinling belt and crop out continuously eastwards into the areas to the north of the Shangdan Suture zone in the eastern Qinling belt through the areas within the South Qinling block. This distribution pattern of post collision igneous rocks suggests that the Triassic collision belt in the Mianleu Suture zone may be extended into the Shangdan Suture zone after passing through the South Qinling block instead into the boundary between the South Qinling block and the South China Craton.
Medium Temperature and Lower Pressure Metamorphism and Tectonic Setting of the Pyeongan Supergroup in the Munkyeong Area
Kim, Hyeong Soo ; Seo, Bongkyun ; Yi, Keewook ;
The Journal of the Petrological Society of Korea, volume 23, issue 4, 2014, Pages 311~324
DOI : 10.7854/JPSK.2014.23.4.311
The Hongjeom formation of the Pyeongan Supergroup in the Munkyeong coalfield mainly consists of metapsammite and metapelites. Metampelites occur as slate preserving chloritoid+chlorite+muscovite and andalusite+biotite+chlorite+muscovite mineral assemblages. Chloritoid and andalusite occur as porphyroblast, and the matrix composed of fine-grained micas. Metamorphic P-T conditions for these mineral assemblages are
and 3.0-3.5kbar based on P-T pseudosection in
system and isopleth intersections of Fe/(Fe+Mg) ratios in chloritoid and chlorite. The medium temperature and low pressure metamorphism resulted from a higher geothermal gradient (
) condition than that of burial metamorphism. The youngest (SHRIMP U-Pb age; ca. 327-310 Ma) detrital zircon grains from the Hongjeom formation display oscillatory zoning and relatively high Th/U ratio (0.60-1.12). Based on the previous sedimentary, paleontological, and geochronological studies in the Taebaeksan basin together with results of this study, we suggest that (1) initial deposition of the Hongjeom formation was contemporaneous with a magmatic activity in the provenance, (2) the Pyeongan Supergroup was deposited in an arc-related basin at an active continental margin during the Carboniferous to Permain, and (3) magmatic activities occurred repetitively in relatively short interval in the active continental margin had continuously supplied sediments to the basin.
A Petrological Study of the Mudeungsan Tuff Focused on Cheonwangbong and Anyangsan
Jung, Woochul ; Kil, Youngwoo ; Huh, Min ;
The Journal of the Petrological Society of Korea, volume 23, issue 4, 2014, Pages 325~336
DOI : 10.7854/JPSK.2014.23.4.325
Even though Mesozoic Mudeungsan tuff, located within Neungju Basin, has been named several rock names, it should be named as Mudeungsan tuff due to several evidences, such as fiamme, welded texture and rock fragments in the Mudeungsan tuff. Volcanic eruption boundary between the Cheonwangbong and Anyangsan areas is not clear, but petrochemical and mineral chemical evidences with different ages indicate clear petrological boundary between Cheonwangbong and Anyangsan. The Mudeungsan tuffs from Cheonwangbong and Anyangsan is welded crystal tuff with dacitic composition and were generated from cogenetic calc-alkaline magma in the volcanic arc environment. Geochemical events indicate that magma beneath Cheonwangbong was seems to have been evolved from the magma beneath Anyangsan due to fractional crystallization dominated by plagioclase.
Effect of Zircon on Rare-Earth Element Determination of Granitoids by ICP-MS
Lee, Seung-Gu ; Kim, Taehoon ; Han, Seunghee ; Kim, Hyeon Cheol ; Lee, Hyo Min ; Tanaka, Tsuyoshi ; Lee, Seung Ryeol ; Lee, Jong Ik ;
The Journal of the Petrological Society of Korea, volume 23, issue 4, 2014, Pages 337~349
DOI : 10.7854/JPSK.2014.23.4.337
We measured rare earth element and Zr concentrations of USGS granite standard material GSP-2 and GSJ granite standard material JG-1a to clarify the effect of zircon during rare earth element analysis using ICP-MS. We also measured rare-earth element and zirconium (Zr) contents of zircon from granite by acid-digestion methods using conventional teflon vial and pressure-bomb. The results show that acid-digestion using teflon vial dissolved ca. 50% of zircon compared to pressure-bomb method. The Zr contents of JG-1a and GSP-2 gave ca 50% of reference value. However, rare-earth element abundance of JG-1a and GSP-2 were similar to those of reference values. This suggests that the decomposition degree of zircon might give a negligible effect on a petrological and geochemical interpretation using chondritenormalized REE pattern.
Distribution of Pyroclastic Density Currents Determined by Numerical Model at Mt. Baekdu Volcano
Yun, Sung-Hyo ; Chang, Cheolwoo ; Kim, Sunkyeong ;
The Journal of the Petrological Society of Korea, volume 23, issue 4, 2014, Pages 351~366
DOI : 10.7854/JPSK.2014.23.4.351
We assumed the situation where an eruption column had been formed by the explosive Plinian eruption from Mt. Baekdu and that the collapse of eruption column had caused pyroclastic density currents to occur. Based on this assumption, we simulated by using a Titan2D model. To find out about the range of the impacts of pyroclastic density currents by volcanic eruption scenarios, we studied the distance for the range of the impacts by VEIs. To compare the results by each volcanic eruption scenario, we set the location of the vent on the 8-direction flank of the outer rim and on the center of the caldera, the internal friction angle of the pyroclastic density currents as
, the bed friction angle as
. We set the pile height of column collapse and the vent diameter with various VEIs. We properly assumed the height of the column collapse, the diameter of the vent, the initial rates of the column collapse and the simulation period, based on the VEIs, gravity and the volume of the collapsed volcanic ash. According to the comparative analysis of the simulation results based on the increase of the eruption, the higher VEI by the increase of eruption products, the farther the pyroclastic density currents disperse. To the northwest from the vent on the northeast slope of the outer rim of the caldera, the impact range was 3.3 km, 4.6 km, 13.2 km, 24.0 km, 50.2 km, 83.4 km or more from VEI=2 to VEI=7, respectively. Once the database has been fully constructed, it can be used as a very important material in terms of disaster prevention and emergency management, which aim to minimize human and material damages in the vicinity of Mt. Baekdu when its eruption causes the pyroclastic density currents to occur.
Petrological Study and Provenance Estimation on the Stone Materials from the Rampart of the Yeongsan-eupseong
Moon, Sung Woo ; Kim, Min Ji ; Kim, Jin Ju ; Jwa, Yong-Joo ;
The Journal of the Petrological Society of Korea, volume 23, issue 4, 2014, Pages 367~373
DOI : 10.7854/JPSK.2014.23.4.367
Yeongsan-eupseong is located at Seongnae-ri, Yeongsan-myeon, Changnyeong-gun, Korea. We investigated the petrological features of the stone materials used for the rampart, and estimated their provenances. The stone materials consist of andesitic rocks, granitic rocks and sedimentary rocks. In the preserved rampart the andesitic rocks are relatively abundant, whereas the large number of granitic rocks are used for restoration. Chaeyaksan andesite and Chusan andesite are thought to be the source for the andesitic rocks. The original granitic rocks are of granite porphyry, and are likely to have been delivered from the near granite porphyry outcrops. On the other hand the granitic rocks used for restoration are classified to be biotite granite. The sedimentary rocks show thermally metamorphosed feature and changed to hornfels. The source for the hornfels is the contact area between the sedimentary rocks and granitic rocks near the Yeongsan-eupseong.
Characteristics of the Small Scale Leucocratic Granites in the Eastern Parts of the Taebaegsan Region, Korea
Yoo, Jang-Han ; Ryoo, Chung-Ryul ;
The Journal of the Petrological Society of Korea, volume 23, issue 4, 2014, Pages 375~383
DOI : 10.7854/JPSK.2014.23.4.375
Precambrian granitic gneisses and Cambrian meta-sedimentary rocks are prevalently distributed in the eastern part of the Taebaegsan region, and biotite granitic batholith of the Jurassic period (?) is found in the southern part of Uljin-si. But small scale leucocratic granitic stocks which commonly found here and there have been rather neglected in the previous studies. The presence of leucocratic granites could be differentiated from the older granitic rocks and biotite granite through the outcrop characteristics, mineral species and geochemical compositions. For the effective comparison between the older granitic rocks and leucocratic ones, pale gray to gray coloured Hongjesa granitic gneiss with granular texture was selectively chosen. The Hongjesa granitic gneiss and biotite granite usually have rather plenty of coloured minerals such as biotite and chlorites. But the leucocratic granites often show sericitic alteration due to the albitization and greisenisation during the post-magmatic alteration, and shows rather bright appearance because of poor amount of coloured minerals. Since all of granitic rocks passed rather high degrees of magmatic differentiation, they belong to calc-alkalic and peraluminous in their characters. Among the alkali elements of the leucocratic rocks
shows higher increase than those of the other granitic rocks, and
only represents slight decrease than those of the Hongjesa granitic gneiss and Uljin granite. On the other hand, CaO and total Fe content are clearly decreased than those of the Hongjesa granitic gneiss and Uljin granite.
Ar Age Determination for the Quaternary Basaltic Rocks in Jeongok Area
Kim, Jeongmin ; Choi, Jeong-Heon ; Jeon, Su In ; Park, Ul Jae ; Nam, Seong Soo ;
The Journal of the Petrological Society of Korea, volume 23, issue 4, 2014, Pages 385~391
DOI : 10.7854/JPSK.2014.23.4.385
Quaternary basaltic rocks occur as volcanic plateau and/or river cliff in the watershed area of Hantan River in Jeongok, central Korea. We measured
ages for the basaltic rocks from Jeongok area using the multi-collector noble gas mass spectrometer and laser heating device introduced for the first time in Korea. The basaltic rocks from the river cliff in Eundae-ri area show the systematic change in
toward the top. The other sample from Jeongok-ri area yields the age of
. This results suggest that there might be a episodic volcanic eruption between 0.12-0.54 Ma in Jeongok area.
SHRIMP U-Pb Ages of the Yongyudo biotite Granites
Kim, Dong-Yeon ; Choi, Sung-Ja ;
The Journal of the Petrological Society of Korea, volume 23, issue 4, 2014, Pages 393~403
DOI : 10.7854/JPSK.2014.23.4.393
U-Pb ages were determined from the Yongyudo biotite granites from western parts of Gyeonggi massif. The results show that the emplacement age of the Yongyudo biotite granite is ca. 227-230 Ma. Such age result that is somewhat older than previous reported ages, suggesting further investigations for the timing and evolution of the Jurassic granites of the western Gyeonggi massif.
The 2014 Eruption and Precursors of Ontake Volcano, Japan
Yun, Sung-Hyo ; Lee, Jeong-Hyun ; Chang, Cheol-Woo ;
The Journal of the Petrological Society of Korea, volume 23, issue 4, 2014, Pages 405~418
DOI : 10.7854/JPSK.2014.23.4.405
Ontake Volcano, Japan, began to erupt without any precursors on September 27, 2014, at 11:52 AM, and it caused many losses of life. Although Japan's preparation manual and prevention for volcanic eruptions and volcanic hazards has been well established, it could not prevent damage due to the sudden eruption of the volcano. Soon after the eruption, however, Japan Meteorological Agency (JMA) led many organizations and institutions, including JMA's Volcanic Eruption Prediction Liaison Council, Meteorological Research Institute (MRI) and National Agriculture and Food Research Organization and they understood the eruption situation quickly and shared the information based on their close cooperation and contact systems. Through these efforts, JMA published the unified result to the public, informing the public of the situation around the volcano and about the eruption and of how the residents and climbers around the volcano should react to the volcanic hazards caused by the eruption. The Korean Government can learn how to respond to a future eruption of a volcano, such as Mt. Baekdu which has the potential to erupt in the foreseeable future.