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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of the Petrological Society of Korea
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Journal DOI :
Petrological Society of Korea
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Volume & Issues
Volume 14, Issue 4 - Dec 2005
Volume 14, Issue 3 - Sep 2005
Volume 14, Issue 2 - Jun 2005
Volume 14, Issue 1 - Mar 2005
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Geochemistry and Sm-Nd isotope systematics of Precambrian granitic gneiss and amphibolite core at the Muju area, middle Yeongnam Massif
Lee Seung-Gu ; Kim Yongje ; Kim Kun-Han ;
The Journal of the Petrological Society of Korea, volume 14, issue 3, 2005, Pages 127~140
The Samyuri area of Jeoksang-myeon, Muju-gun at the Middle Yeongnam Massif consists of granitic gneiss, porphyroblastic gneiss and leucocratic gneiss, which correspond to Precambrian Wonnam Series. Here we discuss a geochemical implication of the data based on major element composition, trace element, rare earth element (REE), Sm-Nd and Rb-Sr isotope systematics of the boring cores in the granite gneiss area. The boring cores are granitic gneiss (including biotite gneiss) and amphibolite. The major and trace element compositions of granitic gneiss and amphibolite suggest that the protolith belongs to TTG (Tonalite-Trondhjemite-Granodiorite) and tholeiitic series, respectively. Chondrte-normalized REE patterns vary in LREE, HREE and Eu anomalies. The granitic gneiss and amphibolite have Sm-Nd whole rock age of
Ma with an initial Nd isotopic ratio of
), which suggests that the source material was derived from old crustal material. Particularly, this initial
Nd value belongs to the range of the geochemical evolution of Archean basement in North-China Craton, and also corresponds to the initial Nd isotope evolution line by Lee et al. (2005). In addition, chondrite-normalized REE pattern and initial Nd value of amphibolite are very similar to those of juvenile magma in crustal formation process.
Pb Isotopic Composition of Yeonhwa and Janggun Pb-Zn Ore Deposits and Origin of Pb: Role of Precambrian Crustal Basement and Mesozoic Igneous Rocks
Park Kye-Hun ; Chang Ho Wan ;
The Journal of the Petrological Society of Korea, volume 14, issue 3, 2005, Pages 141~148
Lead isotopic compositions are analyzed from the sulfide minerals of the Yeonhwa, Janggun and Uljin deposits and from host limestone, intrusives, and basement rocks to reveal the source of Pb in these deposits. In the
plot, Galenas from the Yeonhwa mine display relatively well defined positive linear array, similar to the Precambrian basement rocks of the Korean peninsula. A galena sample from the Uljin mine, Janggun limestone and the basement rocks also follow the variation of Yeonhwa mine. However, ore minerals from the Janggun mine, having relatively low
values, reveal offset from such trend toward lower
values. Considering the fact that Mesozoic igneous rocks and ores within the Gyeongsang basin display considerably lower
values than basement rocks of the Korean peninsula, the deviation of Janggun ore minerals can be interpreted as to reflect mixing between leads from old continental crustal materials and from Mesozoic igneous rocks with more mantle signature. The lead of the Yeonhwa and Uljin mine, following trend of Precambrian basement rather well, seems to have been originated mostly from such basement. However, regarding that they occupy low
side of the variation trend of the basement, the possibility of having some leads derived from the Mesozoic igneous rocks cannot be excluded.
Age Constraints on Human Footmarks in Hamori Formation, Jeiu Island, Korea
Cho Deung-Lyong ; Park Ki-Hwa ; Jin Jae-Hwa ; Hong Wan ;
The Journal of the Petrological Society of Korea, volume 14, issue 3, 2005, Pages 149~156
Ar-Ar, carbon AMS and OSL dating was carried out to clarify the age of the human footmarks on the Hamori Formation, Jeju Island, Korea.
ages of trachybasalt from the Songaksan Tuff, which is underlain by the Hamori Formation, range between
. Radiocarbon AMS ages of humin fractions extracted from sediment samples yielded the maximum limit age of the Hamori Formation as
B.P. The OSL dating of the top and bottom layers of the Hamori Formation gave
, respectively, suggesting that timing of the human footmarks formation can be constrained as between ca 6,800 yr B.P. and 7,600 yr B.P.
Neoproterozoic A-type Volcanic Activity within the Okcheon Metamorphic Belt
Koh Sang-Mo ; Kim Jong-Hwan ; Park Kye-Hun ;
The Journal of the Petrological Society of Korea, volume 14, issue 3, 2005, Pages 157~168
Trachytic rocks among the bimodal metavolcanic rocks of the Gyemyeongsan Formation and adjacent areas are investigated. Some rocks reveal very high content of iron and most rocks show very high abundances of rare earth elements and high field strength elements. Most rocks show significant Eu negative anomaly, which can be interpreted as the result of plagioclase fractionation. Lack of noticeable Nb negative anomaly indicates not-involvement of crustal material in their generation, which excludes the arc environment or remelting of continental crust from their genetic process. Metatrachytes of the Gymyeongsan Formation are plotted within the within-plate environment of the tectonic discrimination diagram utilizing immobile high field strength element Nb and Y. They also show typical characteristics of A-type magma, such as high Ga content. Considering their affinity to Al-type of Eby (1992) and their age of 750 Ma (Lee et al., 1998), they seem to have been produced by the differentiation of mantle-derived within-plate magmatism at the rift, related with the separation of Neoproterozoic supercontinent Rodinia. Possible connection of Gyemyeongsan and Munjuri Formations of the Okcheon metamorphic belt, at least part of them, to the Cathaysia block of South China during the Neoproterozoic is strongly suggested.
Genesis of the acidic metavolcanic rocks distributed around the Chungju iron deposit in the Gyemyeongsan Formation
Park Maeng-Eon ; Kim Gun-Soo ; Park Kye-Hun ;
The Journal of the Petrological Society of Korea, volume 14, issue 3, 2005, Pages 169~179
Acidic metavolcanic rocks distributed around the Chungju iron deposit show significantly high abundances of rare earth elements and high field strength elements. Relatively high
(0) values and lack of negative Nb anomaly suggest that assimilation of crustal material is not involved in their generation. They are plotted within the within-plate environment according the tectonic discrimination diagrams. Such geochemical characteristics are very similar to the acidic metavolcanic rocks of Munjuri Formation. They also show geochemical characteristics of Al-type magma of Eby (1992). All such diagnostic characters indicate differentiation of mantle-derived magma produced from the rift environment, related to the breakup of continent. In contrast to the alkali granites and the rare metal deposit both having age of c. 330 Ma, Sm-Nd isotopic data of the acidic metavolcanic rocks do not form well defined isochron. However, the alkali granites reveal low
(0) values, while the acidic metavolcanic rocks and the rare metal deposit both have significantly higher
(0) values. Considering such differences, we propose following generation hypothesis: The acidic metavolcanic rocks around Chungju iron deposit was erupted at 750 Ma as rest of the acidic metavolcanic rocks of Gyemyeongsan and Munjuri Formations. About 330 Ma ago, partial melting of existing Al-type igneous materials and some old crustal materials produced alkali granite. The rare metal deposit was also produced by redistribution of related materials within the acidic volcanics due to hydrothermal activities occurred at the same time. Sm-Nd isotopic systematics of the acidic metavolcanic rocks were disturbed during the regional metamorphic event at ca. 280 Ma.
An Analysis for Engineering-Geological Factors on the SL-2 Rock Slope along New Road at Hapcheon-Gun, Gyeongsangnam-Do
Choi Jung-Chan ; Song Yong-Sun ; La Won-Jin ; Kim Nam-Hoon ;
The Journal of the Petrological Society of Korea, volume 14, issue 3, 2005, Pages 180~190
The road slope at Hapcheon-Gun, Gyeongsangnam-Do is under construction, but actual rock quality & discontinuities on the cut slope are something different from the primary design. Therefore, object of this study is to analyze whole engineering-geological characteristics for this slope through site investigation and laboratory analyses because small scale landslides have been occurred during this road construction. For this object, various analyses were performed such as surveying, Schimidt Hammer test, discontinuity investigation and laboratory analysis using DIPS far evaluating slope stability. As the result, it is identified that reinforcement work is needed because plane, toppling & wedge failures will be possibly occurred and seepages are concentrated at several points.
제 7 차 국제 에클로자이트 회의(International Eclogite Conference) 참가 보고: 오스트리아 알프스(Bloke Tauern) 야외답사
The Journal of the Petrological Society of Korea, volume 14, issue 3, 2005, Pages 191~194