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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Mineralogical Society of Korea
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Journal DOI :
The Mineralogical Society of Korea
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Volume & Issues
Volume 24, Issue 4 - Dec 2011
Volume 24, Issue 3 - Sep 2011
Volume 24, Issue 2 - Jun 2011
Volume 24, Issue 1 - Mar 2011
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Petrological and Mineralogical Characteristics of Matrix of Pumice in Ulleung Island
Im, Ji-Hyeon ; Choo, Chang-Oh ; Jang, Yun-Deuk ;
Journal of the Mineralogical Society of Korea, volume 24, issue 3, 2011, Pages 151~164
DOI : 10.9727/jmsk.2011.24.3.151
Mineralogical and petrological characteristics were investigated on matrix of dense gray, vesiculate gray, brown and black pumice in Ulleung Island by using XRD, FT-IR, XRF, SEM and thermal analysis. According to the analysis, most of pumice matrix are amorphous and include very small amount of sanidine and anorthoclase. Since the adsorption moistures, which commonly observed as O-H peak in FT-IR spectrum, are not identified in thermal analysis, it seems reasonable to conclude that content of the adsorption moisture has very low level. Although pumice has a large specific surface area, with long time elapsed after eruption, pumice matrix shows very low degree of hydration alteration due to the low level of water content. In SEM images, most surfaces of pumice show morphological characteristics such as various shapes of vesicle with wrinkled and thin walls resulted from ductile coalescence. Dense gray pumice formed in the initial stage includes small vesicles less than
in size with subangular to angular shapes, free of ovoid vesicle. These characteristics are interpreted to have related to the hydrous environment derived from phreato-plinian eruption. Submicron particles observed as amorphous alumina silicate assemblages in vesicle surface are considered as particles sticked to the matrix surface through rapidly cooling process during ascent of alkali phonolitic magma. It indicates that these particles coexisted partly with crystallized alkali feldspar.
Mineral Temperatures of the Sedimentary Basins for Petroleum Resources Exploration, Korea
Son, Byeong-Kook ;
Journal of the Mineralogical Society of Korea, volume 24, issue 3, 2011, Pages 165~178
DOI : 10.9727/jmsk.2011.24.3.165
The potential of petroleum generation was investigated by clay mineralogical changes of illite-smectite on the sedimentary basins: Tertiary Pohang basin and Cretaceouls Gyeongsang basin on land, and offshore basins east and west of Korea. Only disordered illite-smectite mixed layer minerals occur in the Pohang sediment, where petroleum generation cannot be expected due to low temperatures below
. By contrast, the Gyeongsang basin is characterized by the occurrence of illite and high temperatures above
which are obtained by illite crystallinity. The high temperatures indicate that the Gyeongsang sediment ha, already passed through the oil generation stage. The change of disordered illite-smectite to R-l ordered illite-smectite is shown in the sediment of the East Sea continental shelf area at a depth of 2,500 m. Therefore, the oil generation can be expected in the sediments below the depth of 2,500 m. The sequential change of disordered illite-smectie to R=3 ordered illite-smectite through R=l ordered illite-smectite occurs in the sediments of West Sea continental shelf area with burial depth which shows the favorable condition for oil and gas generation. The temperatures of sediments measured by illite-smectite indicate that hydrocarbon potential is very low in the onland basins but high in the continental shelf areas.
Be Age-dating of Marine Sediments from NE Pacific
Choi, Hun-Soo ; Kong, Gee-Soo ; Um, In-Kwon ; Kim, Ji-Hoon ;
Journal of the Mineralogical Society of Korea, volume 24, issue 3, 2011, Pages 179~188
DOI : 10.9727/jmsk.2011.24.3.179
In order to investigate absolute age of marine sediment in the KR5 region, northeastern Pacific, we measured the Be isotope (
) of box core (BC08-02-13) sediment with depth. Core sediment is divided into three sedimentary facies (Facies I, Facies II, FaciesIII). Facies I mainly consists of brown to dark brown (10YR4/3) homogeneous mud with high water content. Facies II shows brownish yellow (10YR6/6) color. The unconformity is recognized at the boundary between Facies I and Facies II, Facies III consists of very dark brown (10YR2/2) mud. Many bioturbated burrows are observed at FaciesII and FaciesIII. Based on Be dating results, FaciesIII and Facies II had been deposited before 3.7 Ma and 2.3 Ma, respectively. After 2.3 Ma, the upper part of Facies II was eroded due to the change of sedimenary environment. Facies I has been deposited since 1.8 Ma. The unconformity located at the boundary between Facies I and Facies II may be driven by the envrionmental change due to the migration of Intertropical Convergence Zone.
Magnetism of Ferric Iron Oxide and Its Significance in Martian Lithosphere
Jeong, Doo-Hee ; Yu, Yong-Jae ;
Journal of the Mineralogical Society of Korea, volume 24, issue 3, 2011, Pages 189~194
DOI : 10.9727/jmsk.2011.24.3.189
Martian satellite missions indicate that Martian equatorial plains are covered by ferric iron oxide. As a non-destructive technique, low-temperature treatment of remanent magnetization is effective in identifying magnetic minerals in rocks. In the present study, four sets of ferric iron oxides were prepared by aqueous alteration of ferrihydrite at warm conditions and four others by dehydration of goethite. As the amount of aluminous trivalent cations increases, crystallographic lattice parameters and N
el temperatures decrease. Such declines originate from lattice distortion as the smaller aluminous trivalent cations substitue the larger terric irons. Whilst high remanence memory was observed for aqueously produced ferric iron oxide, low remanence memory was observed for dehydrated ferric iron oxide. In the future. magnetic remanence memory would be powerful in diagnosing the origin of ferric iron oxide.
Structure Refinement and Equation of State Studies of the Exsoluted Ilmenite-Hematite
Hwang, Gil-Chan ; Kim, Young-Ho ;
Journal of the Mineralogical Society of Korea, volume 24, issue 3, 2011, Pages 195~204
DOI : 10.9727/jmsk.2011.24.3.195
Exsolution intergrowth of ilmenite and hematite was studied by the Rietveld refinement method. According to the analysis on these two structural analog minerals, it was found that octahedron (M2) of Ti in ilmenite is in the least deformation, then that (M1) of Fe in ilmenite is deformed next, and octaheron deformation of Fe in hematite is between M1 and M2. High pressure compression experiment was performed up to 5.8 GPa, where two minerals' XRD peaks merged completely. Ilmenite shows normal compression behavior, whereas hematite shrinks in very small amount. This kind of abnormal behavior might be due to the differential response to the applied pressure corresponding to the different compressibilities of the minerals each other.
Mineral Distribution in the Southeastern Yellow Sea Surface Sediments; KORDI Cruise Samples in 2010
Cho, Hyen-Goo ; Kim, Soon-Oh ; Yi, Hi-Il ; Shin, Kyung-Hoon ;
Journal of the Mineralogical Society of Korea, volume 24, issue 3, 2011, Pages 205~216
DOI : 10.9727/jmsk.2011.24.3.205
Mineral compositions of 69 southeastern Yellow Sea surface sediments collected at the Korea Ocean Research and Development Institute (KORDI) cruise in 2010, were determined using the quantitative X-ray diffraction analysis. Southeastern Yellow Sea surface sediments are composed of major minerals (quartz 49.1%, plagioclase 13.0% and alkali feldspar 9.3%), clay minerals, calcite, and aragonite. Illite (9.4%) is the most abundant clay mineral, chlorite (4.6%) is the second, and kaolinite (0.8%) is few. Quartz and alkali feldspar contents are high in coarse-grained sediments, whereas amphibole and clay mineral contents are high in fine-grained sediments. Quartz, plagioclase, alkali feldspar, chlorite, and kaolinite contents are higher, and illite content is lower in mud zone 1 corresponding to south margin of Central Yellow Sea Mud than in mud zone 2, a part of Southeastern Yellow Sea Mud. Difference of mineral composition between two mud zone suggests that source of fine sediment may be different in two mud zone and Southeastern Yellow Sea Mud might be largely supplied from the Keum and Youngsan rivers in southern part of the west coast in the Korean Peninsula.
Interaction between Selenium and Bacterium and Mineralogical Characteristics of Biotreated Selenium
Lee, Seung-Yeop ; Oh, Jong-Min ; Baik, Min-Hoon ;
Journal of the Mineralogical Society of Korea, volume 24, issue 3, 2011, Pages 217~224
DOI : 10.9727/jmsk.2011.24.3.217
Removal of dissolved selenium by D. michiganensis, a iron-reducing bacterium, and effects of dissolved metal elements such as iron, sulfate, and copper were investigated. Selenide that was reduced from selenite (2 mM) by D. michiganensis was gradually removed from the aqueous medium. As the reduced selenide was combined with aqueous iron, it was precipitated as a nanoparticulate iron-selenide. Sulfate and copper negatively affected the microbial selenite reduction, and the copper was especially toxic to the bacterium, inhibiting a microbial removal of dissolved selenite. These results show that it should be carefully biotreated for a selenium-contaminated site considering in situ sulfate or copper distribution and concentration. Consequently, the formation of iron-selenide by bacteria will be an important measure for preventing a long-distance migration of selenium in the subsurface environments.
Single-Particle Mineralogy and Mixing State of Asian Dust, Spring, 2009
Jeong, Gi-Young ; Choi, Ho-Jeong ; Kwon, Seok-Ki ;
Journal of the Mineralogical Society of Korea, volume 24, issue 3, 2011, Pages 225~234
DOI : 10.9727/jmsk.2011.24.3.225
The mineralogy and mixing state were investigated by the high resolution scanning electron microscopy combined with energy-dispersive X-ray analysis on particles of the total suspended solid (TSP) samples collected during the Asian dust event, spring, 2009. Relatively large particles were dominated by quartz, plagioclase, K-feldspar, amphibole, biotite, muscovite, chlorite, and calcite. Clay minerals usually occur as thin coatings on the coarse minerals or as aggregates. Calcite nanofibers are often admixed with clay platelets in the clay coatings and aggregates. Dust particles were classified on the basis of their main minerals. The single-particle mineralogy and mixing state of the TSP sample are consistent with those of
samples in previous studies.
Surface Texture Changes due to the Oxidation of Pyrite by Acidithiobacillus Ferrooxidans
Yu, Jae-Young ; Koh, Hyun-Jin ; Song, Hong-Gyu ;
Journal of the Mineralogical Society of Korea, volume 24, issue 3, 2011, Pages 235~244
DOI : 10.9727/jmsk.2011.24.3.235
A batch experiment of pyrite oxidation was performed and the surfaces of the reacted pyrite were regularly observed with the scanning electron microscope (SEM) together with the chemical compositions of the solution to help understand the oxidation mechanisms of pyrite by Acidithiobacillus ferrooxidans (Af). The dissolved Fe concentrations clearly indicated that Af experiences the lag and then exponential growth phase. An Af cell was observed to be attached to the surface of pyrite during the lag, implying that a direct leaching by the microbe really happens for the period. It is not certain, however, whether the main mechanism of pyrite oxidation during that time was the direct leaching or not, because there were just a few cells confirmed to be attached and most of the dissolved Fe was Fe(III). The dissolved Fe concentration stayed almost constant from the mid-lag phase to just before the onset of the exponential phase, suggesting that AI needs an adaptation time to switch its oxidation mechanism from one to the other whichever it is during that stage of growth. The moment of Af's cell division was observed by SEM on the surface of pyrite during the lag phase. The corrosion outline around the dividing cell was quite similar to the shape of the cell itself, which implies that the rate of the microbial oxidation is very uneven and the rate when the cell metabolizes should be much faster than that calculated from the concentration variation of the dissolved Fe. The number of etch holes by Af is much higher on the inoculated surfaces, indicating the average rate of pyrite oxidation is also much faster than that of abiotic oxidation. The microbial etch holes on pyrite surface are small and deep, which may influence the transition of the growth phases of Af from lag to exponential.
Geology and Mineral Resources of Colombia
Koh, Sang-Mo ; Lee, Gill-Gae ; You, Byoung-Woon ;
Journal of the Mineralogical Society of Korea, volume 24, issue 3, 2011, Pages 245~252
DOI : 10.9727/jmsk.2011.24.3.245