• Korean Journal of Mineralogy and Petrology
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• v.33 no.4
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• pp.325-337
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• 2020

The Jurassic granitic rocks in the area of Gwangdeoksan located along the boundary between Hwacheon and Cherwon in northern Gyeonggi Massif consist of two-mica granite, garnet-bearing two-mica granite, mica-granite, and porphyritic biotite granite. These granitic rocks are calc-alkaline series and plotted in peraluminious domain in A/CNK vs. A/NK diagram. Petrographical and geochemical data indicate that the porphyritic biotite granite which intruded at the last period originated from distinct parental magma from two-mica granite, garnet-bearing two-mica granite, and mica-granite. On the basis of Rb/Sr vs. Rb/Ba diagram and Al2O3/TiO2 vs. CaO/Na2O, it is inferred the porphyritic biotite granite originated from protolith with less pelitic composition than 3 other granitic rocks. The enriched values of lithophile elements of Cs, Rb, and Ba and negative trough of Nb, P, Ti on spider diagram suggest that the peraluminous Jurassic granitic rocks in Gwangdeoksan area formed in subduction tectonic environment. Whole-rock zircon saturation thermometer indicates that the granitic rocks in the study area were melted at 692-795℃.

• 한국문화재보존과학회:학술대회논문집
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• 2003.03a
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• pp.32-32
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• 2003

• The Journal of the Petrological Society of Korea
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• v.18 no.2
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• pp.153-169
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• 2009

Hornblende gabbro-lamprophyre-diorite Complex in Guwoonri, Hwacheon distributes in a zonal pattern, where the diorite distributed along the margin of the Complex encompasses the hornblende gabbro body in the central part of the Complex, and lamprophyre intruded in vein along the boundary between diorite and hornblende gabbro. The hornblende gabbro in the central part of the Complex also shows a zonal distribution pattern, where hornblende gabbro containing subspherical amphibole phenocrysts as a major mafic mineral(Sag) surrounds hornblende gabbro with prismatic amphiboles as a principal mafic mineral(Pag). The zonal distributions observed in hornblende gabbro-lamprophyre-diorite Complex in Guwoonri resulted from two different geological processes. The zonal distribution among diorite, lamprophyre, and hornblende gabbro was due to intrusions of three distinct magmas derived from different degree of partial melting of a common source rock, whereas the zonal distribution shown within the hornblende gabbro body occupying the central part of the Complex resulted from an inward fractional crystallization of a single magma. Geochemical characteristics and mineral mode of hornblende gabbro, lamprophyre, and diorite indicate that these rocks formed from hydrous mafic to intermediate magma derived from partial melting of enriched mantle, which has been caused by infiltration of volatiles including water into mantle in plate margin.

• The Journal of the Petrological Society of Korea
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• v.25 no.4
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• pp.335-348
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• 2016

The fluvial Tamna Formation, consisting of conglomerate, sandstone and mudstone layers, is widely distributed in Jeiu Island. Various sizes of quartz crystals were identified from most of the Tamna Formation, including the mudstone layer. XRD analysis also shows that the mudstone layer is composed of various minerals, quartz, plagioclase, K-feldspar, mica, magnetite, hematite, olivine, amphibole, gibbsite, calcite, analcime and clay minerals such as illite, kaolinite, vermiculite, smectite, chlorite, $10{\AA}$-halloysite. There is a tendency showing that the more amount of kaolinite, vermiculite, and chlorite is present where the more amount of quartz crystals is present. It is likely that the main source materials contributing to the Tamna Formation were from the parental rocks containing abundant quartz grains, suggesting that the Tamna Formation could not be related to Jeju volcanic rocks, but possibly to pre-existing basement rocks. Thus, we propose that the Tamna Formation was formed from the materials derived from both pre-existing basement rocks and Jeju volcanic rocks, which were subsequently affected by diagenesis, hydrothermal alteration and weathering process.

• The Korean Journal of Petroleum Geology
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• v.4 no.1_2 s.5
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• pp.27-39
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• 1996

In the Cretaceous, the Gulf Coast Basin evolved as a marginal sag basin. Thick clastic and carbonate sequences cover the disturbed and diapirically deformed salt layer. In the Cretaceous the salinities of the Gulf Coast Basin probably matched the Holocene Persian Gulf, as is evidenced by the widespread development of supratidal anhydrite. The major Lower Cretaceous reservoir formations are the Cotton Valley, Hosston, Travis Peak siliciclastics, and Sligo, Trinity (Pine Island, Pearsall, Glen Rose), Edwards, Georgetown/Buda carbonates. Source rocks are down-dip offshore marine shales and marls, and seals are either up-dip shales, dense limestones, or evaporites. During this period, the entire Gulf Basin was a shallow sea which to the end of Cretaceous had been rimmed to the southwest by shallow marine carbonates while fine-grained terrigengus clastics were deposited on the northern and western margins of the basin. The main Upper Cretaceous reservoir groups of the Gulf Coast, which were deposited in the period of a major sea level .rise with the resulting deep water conditions, are Woodbinefruscaloosa sands, Austin chalk and carbonates, Taylor and Navarro sandstones. Source rocks are down-dip offshore shales and seals are up-dip shales. Major trap types of the Lower and Upper Cretaceous include salt-related anticlines from low relief pillows to complex salt diapirs. Growth fault structures with rollover anticlines on downthrown fault blocks are significant Gulf Coast traps. Permeability barriers, up-dip pinch-out sand bodies, and unconformity truncations also play a key role in oil exploration from the Cretaceous Gulf Coast reservoirs. The sedimentary sequences of the major Cretaceous reseuoir rocks are a good match to the regressional phases on the global sea level cuwe, suggesting that the Cretaceous Gulf Coast sedimentary stratigraphy relatively well reflects a response to eustatic sea level change throughout its history. Thus, of the three main factors controlling sedimentation (tectonic subsidence, sediment input, and eustatic sea level change) in the Gulf Coast Basin, sea-level ranks first in the period.

• Journal of the Korean earth science society
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• v.22 no.3
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• pp.163-178
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• 2001

Granite gneiss, pophyroblastic gneiss and leucocratic gneiss are widely distributed in the Seungju-Suncheon area, the southwestern part of the Sobacksan Massif, Korea. These orthogneisses show intrusive relationships in outcrops of the study area. This study focuses on the geochemical properties and the tectonic environments for the original rocks of these orthogneisses. The pophyroblastic gneiss is plotted in diorite and granodiorite domain, and granite gneiss and leucocratic gneiss are plotted in both of granodiorite and granite domains on lUGS silica-alkali diagram. Geochemical properies of major elements suggest that these rocks are sub-alkali rock series, and were formed from S-type magma which generated in syn-collision tectonic environment. Discrimination diagrams using HFS elements suggest that original rocks of the three orthogneisses were granitoid of calc-alkali rock series, and were formed in syn-collision environment.

• The Journal of the Petrological Society of Korea
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• v.4 no.2
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• pp.124-133
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• 1995

Oxygen isotope compositions have been determined for the granitic and the related rocks from the Wolf River Ratholith, Wisconsin in U.S.A. Plutons which belong to the differentiation trend are almost identical in oxygen isotope fractionation, and plutons of undifferential sequences also show oxygen isotope compositions similar to each other, which show little isotope fractionations at high temperature range. In oxygen osotope composition, the country rocks (the Penokean plutonic rocks), which is higher by 1~2 permil than the batholith are improbable source of the batholith. However, the assimilation of parent magma of lower ${\delta}^{18}O$ values than the batholith with the Penokean plutonic rocks might have produced the batholith.

• The Journal of the Petrological Society of Korea
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• v.11 no.3_4
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• pp.200-213
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• 2002

The Andong granitoid batholith represents five temporally distinct episodes (phases) of igneous activity. The batholith represents a plutonic complex of five pulsatively emplaced distinct intrusive multiphases. The petrochemical data show that the plutons fall into calc-alkaline series except for the Yean pluton, and plot within the diaenostic range for I-type origin and continental arc orogenic tectonic setting. Each pluton reveals systematic compositional variations of major and trace elements with $SiO_2$ or MgO, but different variation trends for some elements and considerably different REE patterns. Thus discontinuous, inconsistent variations in the elements indicate that the five plutons can not be explained by simple fractional crystallization from the same primary magma, but were intruded and solidified from the independent magmas of chemically heterogeneous origin. In the Andong, Dosan and Pungsan plutons, high values of molar CaO/(MgO+$FeO^{t}$ ) combined with low $Al_2$$O_3$/(MgO+$FeO^{t}$ ) and $K_2$O$Na_2$O ratios suggest a magma originated by dehydration melting of a metabasaltic to metatonalitic protolith. Whereas the Imha pluton show similar values of CaO/(MgO+$FeO^{t}$ ), but significantly higher ratios of $Al_2$$O_3$/(MgO+$FeO^{t}$ ) and $K_2$O$Na_2$O implying to a metagreywacke protolith.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.02a
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• pp.289-289
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• 2010

정상 세포로부터 암과 같은 종양세포를 제거하는 방법으로 암세포가 사멸되는 임계온도 보다 높게 악성조직에 열을 가하는 방법이 연구되어지고 있다 [1]. 전류가 흐를 수 있는 4개의 전기탐침을 종양조직에 삽입하여 국부적으로 열을 발생시키는 발열요법으로 암을 치료하는 연구가 고려되고 있다. 발열요법은 1960년대에 시작하여 우리나라에서는 1985년 연세 암센터에서 capacitive type의 RF heating 또는 전자파에 의한 국소가온법과 방사선치료와 병용으로 이용되고 있다. 주로 이용되는 방법은 Radio frequency heating, Microwave heating, ultrasound heating을 들수 있다. 라디오주파수는 보통 300 MHz 이하의 주파수를 가리킨다. 본 연구에서는 교류파 대신에 직류전원에 의해 열을 발생하는 경우에 관한 연구이다. 전극에 의해 형성되는 전기장에 대한 방정식은 전도매질에서의 DC 응용모드이고, 조직 내에서의 직류 전류에 의해 발생되는 온도 분포를 모델링하는 bioheat 방정식과 연계된 문제이다. 전기장에 의해 발생되는 열의 근원은 resistive heat 또는 Joule 열이다. 본 연구에서는 교류 전류에 의한 RF heating 대신 단순한 모델의 경우로 직류 전류에 의한 열 발생에 관한 이론적 연구를 수행하였다. 종양 조직 내에 삽입된 전극에 22V를 인가하면 60초 이내에 $80^{\circ}C$까지 급속히 증가 된 후, 서서히 $90^{\circ}C$에 까지 도달한다. 4 개의 전극에 대칭적인 전위가 인가 된 경우 $50^{\circ}C$ 이상의 온도 분포를 암 조직의 모양과 유사하게 분포하게 하여 효과적인 치료를 수행 할 수 있는 조건을 제시한다.

• The Korean Journal of Petroleum Geology
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• v.11 no.1 s.12
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• pp.1-8
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• 2005

Seventeen exploratory wells have been drilled in the Block VI-1 of offshore Korea, which is located in the southern part or the Ulleung Basin. Gas show has been recognized from most of the wells, and gas and condensate have been accompanied in some wells. Commercial discovery of gas, accompanied by condensate, has been made from Gorae V well. The reservoir gases or the Dolgorae III, Gorae I, and Gorae V wells in the Ulleung Basin mainly consists of hydrocarbon gases (>93%). These gases are thermogenic wet gases which contain more than 96% of the methane and result from the cracking of petroleum or kerogen. Based on the chemistry and composition of the gases and stable isotope data, they seem to be generated from different source rocks. The condensates from the Gorae I and V wells are mostly generated from terrestrial organic matter. Lacustrine organic matter may not play an important role for the generation of these condensates. The condensates from the Gorae V wells consist predominantly of terrestrial organic matter but with minor subsidiary input from marine organic matter. The condensates from Gorse I and V wells may be generated from different source rocks. The thermal maturity level of the condensates from the Gorae V well ranges from early to middle oil generation zone and condensate from Gorae I reaches middle oil window. Correlation or the thermal maturation level of the condensates and organic matter in the sediments reveals that a depth of the generation of liquid hydrocarbons can be inferred to 3,000 m and 3,900 m for the Gorae V and I wells, respectively. Gorae V well, however, did not reach the target depth and the geochemical data of the Gorae I well were obscured due to the severe sediment caving in.