• The Journal of the Petrological Society of Korea
• /
• v.27 no.2
• /
• pp.105-108
• /
• 2018

This study was on the rock garden among the school gardens as survey of 122 schools(60 elementary schools, 34 middle schools and 28 high schools) during 16 months from March 2017 to June 2018, There were 36 rock gardens (29.51%). 40% elementary schools and 18.18% secondary schools (middle and high schools) had the rock gardens. 3 items were surveyed; Was the rock sample in the rock garden related to the curriculum? Was the name of sample correct? Was the content of a sample's exhibition panel suitable? Elementary schools showed 36.7% in response to 'Was the rock sample in the rock garden related to the curriculum', 55.1% in response to 'Was the name of sample correct?' and 55.5% in response to 'Was the content of a sample's exhibition panel suitable?' Secondary schools showed the average 83.9% correlation in the aspect of curriculum, 82.8% accuracy in the aspect of sample name and 84.1% suitability in the aspect of the content of a sample's exhibition panel.

• The Journal of the Petrological Society of Korea
• /
• v.20 no.3
• /
• pp.141-149
• /
• 2011

Samples (two granites, marble, sandstone) were heated in an electric furnace at temperature $400^{\circ}C$ and $600^{\circ}C$ in order to investigate the change of physical properties of rocks depending on the heating temperature. Changes of Color and physical properties such as specify gravity, porosity, absorption, p-wave velocity are visible while mineralogical changes by using polarizing microscope are not pronounced. In addition, porosity and absorption increased while specific gravity and p-wave velocity decreased at a more higher temperature ($600^{\circ}C$). Although the open porosity does not indicate total porosity of the rock. but p-wave velocity can be used to evaluate the degree of damage Therefore, porosity and p-wave velocity should be compared in order to investigate the change of physical properties of rocks depending on the heating temperature.

• The Journal of the Petrological Society of Korea
• /
• v.11 no.1
• /
• pp.49-53
• /
• 2002

최근에 연구비의 지원과 연구자의 평가, 기관 평가 등에 활용되는 국내의 연구업적 평가제도가 상당한 변화를 겪고 있다. 하지만 지질과학 대부분 분야의 경우에는 근본적으로 이러한 변화에 적응하기가 매우 어려운 여러 가지 문제를 갖고 있는 실정이다. 하지만 다른 분야의 학자들 못지 않게 노력해서 얻은 성과에 대해서는 정당한 평가와 대우를 받아야 한다고 생각하며 어떻게 하면 이러한 결과를 얻을 수 있을지에 대한 대책이 필요하다. 지질과학분야의 기본적인 자료들을 사장시키지 않고 발표함으로써 많은 연구자들에게 개방할 수 있도록 노력하는 것은 보다 활성화된 논의를 이끌어 낼 수 있는 하나의 방법이라고 생각된다. 또한 다음과 같은 형태의 연구결과들도 정당한 논문으로써 발표되어야 한다고 생각한다： 기존의 지질도를 수정하거나 보완하는 야외조사 자료, 야외나 실내에서의 기재적 연구결과, 새로운 해석을 제시하는 창의적 아이디어 등이다. 이러한 결과들이 학술지를 통해 발표됨으로써 이러한 기본자료를 생산하려는 중복된 노력을 절약 할 수도 있으며, 연구자들의 전체적인 역할 분담이 가속화되고 더욱 빠른 기간 내에 보다 진전된 연구성과를 얻을 수 있을 것으로 기대한다.

• The Journal of the Petrological Society of Korea
• /
• v.5 no.2
• /
• pp.142-160
• /
• 1996

Petrological and geochemical characteristics of A-type granite were studied from the Namsan and Tohamsan granites in the vicinity of Kyeongju city, southeastern Korea. The Namsan granite consists of hypersolvus alkali-feldspar granite in the northern part and subsolvus alkali-feldspar to biotite granite in the southern part. This hypersolvus granite usually has miarolitic cavities and is characteristically composed of quartz, single homogeneous one-feldspar (alkali feldspar) forming tabular microperthite crystals, or micrographic intergrowth with quartz, and interstitial biotite (Fe-rich annite), alkali amphibole (riebeckitic arfvedsonite) and fluorite. Petrographic and petrochemical characteristics indicate that the hypersolvus granite and subsolvus granite from the Namsan belogn to the A-type and I-type granitoid, respectively. The A-type granite is petrochemically distinguished from the I-type Bulgugsa granites of Late Cretaceous in South Korea, by higher abundance of $SiO_2$, $Na_2O$, $Na_2O+K_2O$, large highly charged cations such as Rb, Nb, Y, Zr, Ga, Th, Ce. U the REEs and Ga/Al ratio, and lower abundance of $TiO_2$, $Al_2O_3$, CaO, $P_2O_5$, MnO, MgO, Ba, Sr, Eu. The total abundance of REEs is 293 ppm to 466 ppm, showing extensively fractionated granitic compositon, and REEs/chondrite normalized pattern shows flat form with strong Eu '-' anomaly ($Eu/Eu^{\ast}$=0.03-0.05). A-type granite from the Namsan area is thought to have been generated late in the magmatic/orogenic cycle after the production of I-type granite and by direct, high-temperature partial melting of melt-depleted, relatively dry tonalitic/granulitic lower crustal material with underplating by mantle-derived basaltic magmas associated with subduction.

• The Journal of the Petrological Society of Korea
• /
• v.14 no.1
• /
• pp.45-60
• /
• 2005

This study was intended to elucidate the petrography and geochemical characteristics of the Someori Basalt in the Udo monogenetic volcano, eastern Jeju Island. The Someori basalts consist of plagioclase, olivine, orthopyroxene, clinopyroxene and ilmenite. The Someori basalts are plotted into subalkali rock series on the TAS diagram, and belong to tholeiitic basalts in the diagram of alkali index against to Al₂O₃ contents. The basalts belong to tholeiitic rock series, having normative quartz (less than 3.9%) + hypersthene + diopside.

• The Journal of the Petrological Society of Korea
• /
• v.28 no.4
• /
• pp.307-317
• /
• 2019

Petrological studies were performed on the Sanbangsan lava dome, located in the southwest of Jeju Island Volcanic Field. According to the lava ejection method, it is 'an internal primitive form' that is gradually pushed up and expanded by continuous magma injection from the bottom to the top of the vent and it corresponds to the 'low lava dome'. The rocks are partly plotted in the field of benmoreite, but mostly plotted in the field of trachyte of the Cox et al.(1979) classification diagram, and also mainly plotted in the field of trachyte of Le Maitre et al.(2002) and Zr/TiO₂-Nb/Y classification diagram. Therefore, the expression that described the rock of Sanbangsan lava dome as 'trachy-andesite' should be corrected to 'trachyte'. The volcanic rocks that consists in the Sanbangsan lava dome are trachyte containing normative quartz and shows differentiation trend in the range of 59.75-63.46 wt.% SiO₂.

• Korean Journal of Microbiology
• /
• v.42 no.1
• /
• pp.7-11
• /
• 2006

To see effect of marine rock powder and fungal culture supernatant, we analyzed the biodegradation rates of harmful marine dinoflagellate, Heterosigma akashiwo and Prorocentrum minimum for developing the effective control methodology of algal bloom. Relatively low removal rates were observed in the treatment of marine rock powder or buffer solution alone. However, the lysis of H. akashiwo and P. minimum was enhanced in the combined treatments of marine rock powder with fungal supernatant. The effective concentration and exposure time of fungal supernatant for the lysis of H. akashiwo and P. minimum were 5 ml/l and 30 minutes, respectively. These results suggest that the fungal supernatant may be a biocontrol agent for the control of algal blooms in seawater.

• Journal of the Mineralogical Society of Korea
• /
• v.14 no.2
• /
• pp.85-98
• /
• 2001

This study deals with the petrographic examination of aggregates(ASTM C 295) which is one of the methods to diagnose the quality of aggregates for concrete artifacts. A number of examinations including size and sieve analysis, test on the coating material, description of the weathering and contamination condition, petrographic description, and qualitative and quantitative analyses on the rocks and minerals potential to alkali-aggregates reactivity are carried out to examine the quality of aggregates. Petrographic description method examined on the fluvial aggregates from Maewhacheon A, B area, Uljin-gun, Kyungnam province shows that weathering grade ranges from F(fresh) to WS(slightly weathered) and coating material and contamination are not in a harmful condition. The weight percentage of the alkali-aggregates reactive minerals or structurally unstable rocks of the aggregates from study area covers 26% and 19% of all aggregates, respectively. So it is necessary to further identify their quality through the chemical(ASTM C 289) and mortar-bar method (ASTM C 227).

• The Journal of the Petrological Society of Korea
• /
• v.26 no.4
• /
• pp.361-371
• /
• 2017

We investigated geochemical characteristics of the Dodong Basaltic Rocks in the lower part of the Ulleung Island. They have lithological range of alkali basalt to trachybasalt, belonging to Na and K subseries of alkaline series. They mostly fall within the field of alkalline within-plate basalts on tectonic discrimination diagrams, and then plot in the field of oceanic island basalt (OIB). Geochemically, extension of lithospheric mantle and asthenospheric upwelling after East Sea under an Cenozoic extensional tectonic setting might be a heat source for partial melting of the enriched lithospheric mantle, which might generate the basaltic magma. But we cannot exclude that mantle plume might also be a heat source for melting of the lithospheric mantle.

• Journal of the Korean Society of Earth Science Education
• /
• v.9 no.2
• /
• pp.233-242
• /
• 2016

The purpose of this study was learning about the project 'stratum and the rock ' of pre-primary teachers to the effects of self-directed learning ability and environmental sensitivity. This study was set up experimental treatment period of 15 weeks from March 2016 to June, students who are B Education University of fourth grade the first semester participated, in the study, It was composed of 34 students of 1 class taking 'strata and rock' lecture. Experimental study group consisted of exploration activities on the field experience about strata and rock. Set the area they want to explore the site by teams. The results of this study are as follows. First. learning about the project 'stratum and the rock ' of pre-primary teachers was effective to self-directed learning skills. 2nd, Learning about the project 'stratum and the rock ' of pre-primary teachers was effective to environmental sensitivity. 3rd, The students showed a positive response and were interested in the project 'stratum and the rock ' of pre-primary teachers.