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고정선,윤성효,안지영,김향수,최유종,Ko, Jeong-Seon,Yun, Sung-Hyo,Ahn, Ji-Young,Kim, Hyang-Soo,Choi, You-Jong 한국지구과학회 2000 한국지구과학회지 Vol.21 No.1
In Kyeongsang basin, there were very dynamic magmatic activities, resulting to form volcanic and plutonic rocks. A plutonic recycle appeared in this region. Presumption of the pressure for hornblende-bearing granitic rock among the plutonic rocks, can support important informations for the emplacement depth of Cretaceous Bulgugsa granites in Kyeongsang basin. $Al^T$(Al total) contents of hornblende is related to the pressure, oxygen fugacity, and compositions of other minerals having the solid solution. So we apply the $Al^T$ content of hornblende to several empirical and experimental geobarometer systems to presume the pressure and to determine the emplacement depth of Cretaceous Bulgugsa granites in Kyeongsang basin from the inferred pressure. With the result that we applied the $Al^T$ contents of hornblende to the various geobarometers, there was a positive relationship between the pressure and $Al^T$. The minimum pressure value ranges from 0.73 to 1.70kbar in Kyeongju and the maximum value from 2.02 to 3.16kbar in Kimhae. And then the tectonic setting in Kyeongsang basin has no relation to the emplacement depth of Cretaceous granites and means variations with the movement of vertical component in each area. As we suppose that the density of earth's crust is $2.8g/cm^3$, the average values of the emplacement depth ranges in each area range from 2.6 to 11.4km. These data confirm the previous idea about the emplacement depth of Cretaceous granites in Kyeongsang basin, and these geobarometers using the $Al^T$ contents of hornblende is available though they have much limits. Therefore Cretaceous Bulgugsa granites in Kyeongsang basin was the shallow depth intrusive rut and the exposed granites was the shallow depth crust.
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경북 청송군 주왕산지역의 대전사 현무암의 암석학적 특성
고정선,안지영,윤성효,Koh, Jeong-Seon,Ahn, Ji-Young,Yun, Sung-Hyo 한국지구과학회 2000 한국지구과학회지 Vol.21 No.5
Daejeonsa basalt in the Mt. Juwang area is composed of 12 lava flows alternate with 9 peperites, and each lava and peperite has variable thickness. Globular peperites yielded in Daejeonsa basalt are mixed basalt clasts with reddish shale. Based on field description, when lava flows over unconsolidated wet shale or injectes into unconsolidated wet shale, peperites were formed at the contacts between lava and shale. Daejeonsa basalt are massive lava flows with rare vesicules: some vesicules are found in upper part of a flow unit. The basalt has mainly pseudomorphs of olivine as phenocryst, and also plagioclase and clinopyroxene phenocrysts in rocks with higher Mg-number. Matrix is mainly subophitic texture, sometimes showing ophitic and intergranular textures due to different cooling rate. Clinopyroxene is augite(Wo$_{41.6}$En$_{45.1}$Fs$_{13.3}$), and plagioclase is mostly labradorite(An$_{55.0}{\sim}_{67.7}$), but some is andesine(An$_{44.3}$) and bytownite(An$_{74.5}$). Oxide minerals are composed of titanomagnetite and ilmenite.
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고정선,윤성효,김석연 한국지구과학회 2007 한국지구과학회지 Vol.28 No.4
The purpose of this study is to determine the petrology of basalt and the volcanic process in the Seondolpart, pyroclastic deposits including reddish brown blocks, ashes with volcanic bombs in the middle part, and dark blackscoria deposits in the upper part. The volcanic sequences suggest volcanic processes that progress through Strombolianeruption and end with Hawaiian lava effusion which breached the cinder cone northwestward and extended overnorthwestward as lava delta and basalt emplaced as a volcanic neck in the central part of crater in the cinder cone. Theage of basalt lava flows is about 95 ± 3 ka. The basalts belong to transitional basalt and show products of fractionalcrystallization of clinopyroxene and olivine from a parental basalt magma on the basis of variation diagram of major,trace and rare earth elements. Basalts in the region of this study are plotted at the region of within plate basalt.......... Seobjikoji, Seondol cinder cone, transition basalt, fractional crystallization, within plate basalt. . : . ..... ... .... .... ... .... .. .... . ... .... ..... ..... , .... , ... . ..... .. .. .... .. .... ..... .... .... ...
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