• Title/Summary/Keyword: 김천화강암

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Implication for the emplacement depth of the granites in the Yeongnam Massif, using the aluminum-in-hernblende barometry (각섬석 지압계를 이용한 영남육괴 내 화강암의 정치심도와 그 의미)

  • 홍세선
    • The Journal of the Petrological Society of Korea
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    • v.10 no.1
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    • pp.36-55
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    • 2001

  • Hornblende geobarometry has been applied to estimate the emplacement depth of the Jurassic Yeongiu, Andong, and Gimcheon granites in the Yeongnam Massif. Geobarometry was determined from the twenty two samples of the Yeongiu granite, ten samples of the Andong granite and twelve samples of the Gimcheon granite, using the composition of hornblende rims coexisting with the mineral assemblage required for pressure determination. Amphibole compositions in the three granites vary from edenite to ferropargasite with the increase of pressure. According to the equation of Schmidt(1992), the pressures of emplacement of the Yeongiu, Andong, and Gimcheon granites are 5.6 to 7.9 kb, 5.5 to 7.5 kb, and 4.1 kb to 5.3 kb, respectively. The emplacement depth in the Yeongiu granites increase systematically from about 6 kb in the northwest to about 7.5 kb in the southeast. Andong granite shows no systematic change of the pressure estimates. The Gimcheon granite shows almost consistent pressure distribution. The pressure difference of about 1.5 kb across the Yeongiu granite may be explained by a model combining late postemplacement upsurge of a deeper part of the pluton in the south with tilting of the batholith by Yecheon shear zone.

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Petrological Study on Small-scale Granites in the Central Part of Yeongnam Massif (영남육괴 중부지방에 존재하는 소규모 화강암체들의 암석학적 연구)

  • Kim, Hyeong-Gyu;Jwa, Yong-Joo;Kim, Jae-Hwan;Park, Sung-Chul
    • The Journal of the Petrological Society of Korea
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    • v.28 no.4
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    • pp.279-298
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    • 2019

  • Mupung granite, which is located adjacent to Gimcheon granites to the north and Geochang granites to the south, has been known to consist of biotite-hornblende granite (Gbh), porphyritic granite (Gp), and hornblende-biotite granite (Ghb). In this study, we subdivided the Gbh of Mupung granite into biotite granite (Gb) and biotite hornblende granite (Gbh), based on petrological observations. The grayish Gb with medium to coarse grain and porphyritic texture contains a small amount of muscovite, but the hornblende and mafic microgranular enclave (MME) is not observed in Gb. On the other hand, MME can be commonly found in pinkish Gbh. The mafic minerals in Gbh are mostly hornblende and biotite. In the Gb in Mupung granites, the hornblende and sphene (which is the characteristic minerals in Gimcheon granite) are not observed. In addition, the trend of the changes in major elements of Gb in Mupung granites is similar to that of Geochang granites. These petrological characteristics suggest that the Gb in Mupung granite has a similarity with Geochang granite (than Gimchen granite). We also observed that the texture and composition of minerals of Gbh, as well as those of surrounding Gp and Ghb, are consistent with the characteristics of Cretaceous granites in Gyeongsang basin, rather than those of Jurassic granites in Yeongnam massif.

  • https://doi.org/10.7854/JPSK.2019.28.4.279 인용 PDF KSCI

Source Area Investigation and Petrological Characteristics of Rock Properties from the Jeseokri Stone-Lined Tombs in Gimcheon, Korea (김천 제석리 석곽묘 석재의 암석학적 특성과 공급지 해석)

  • Cho, Ji Hyun;Lee, Chan Hee
    • Economic and Environmental Geology
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    • v.51 no.6
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    • pp.595-606
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    • 2018

  • In this study, we investigated the source area and petrological characteristics of rock properties from the Jeseokri stone-lined tombs located in Gimcheon by analyzing its rocks and source rocks. As a result, the Jeseokri stone-lined tombs consists in a total 11 kinds of various rock types. And aplite (34.5%), leucocratic granite (26.9%) and schistose granite (24.4%) have a large percentage of the rock's composition. By examining the possible provenances, the same rock types and the stones of a similar with metamorphic grades are discovered along the Jeseok mountain valley located to the south of tombs. These findings suggest that the rock properties of the Jeseokri stone-lined tomb were supplied from the upper Jeseok mountain valley and about 1.7km away from Jeseokri. This study could be used for the archaeogeological interpretation of funeral culture and conservation data of buried cultural properties in the age.

  • https://doi.org/10.9719/EEG.2018.51.6.595 인용 PDF KSCI HTML