Petrogenesis and Solidification Depth of the Jurassic Daebo and Cretaceous Bulguksa Granitic Rocks in South Korea

Etsuo Uchida, Seon Gyu Choi, Daisuke Baba, Yusuke Wakisaka

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    We investigated the Jurassic Daebo and Cretaceous Bulguksa granitic rocks in South Korea. The former are distributed mainly in the Gyeonggi and Yeongnam massifs and the latter are present in the Gyeongsan basin and Ogcheon belt. The Daebo granitic rocks generally are of ilmenite series and I to S type. These rocks are associated with Au-Ag hydrothermal deposits, whereas the Bulguksa granitic rocks are of magnetite series and I type, and are associated with Pb-Zn, Cu and Mo-W hydrothermal deposits, as well as Au-Ag hydrothermal deposits. The Daebo granitic rocks show adakitic signatures in their chemical compositions. They are considered to have been derived from partial melting of the thick lower continental crust. Conversely, the Bulguksa granitic rocks in the Gyeongsan basin are non-adakitic and are considered to have been derived from partial melting of a mantle wedge. Magmas of the Daebo granitic rocks formed at relatively shallow levels, but solidified at deep levels compared with those of the Bulguksa granitic rocks. The Bulguksa granitic rocks in the central to western Ogcheon belt are considered to have been formed by fractionation of magmas derived from partial melting of continental crust. The total Al contents of biotite and hornblende in the granitic rocks increased, with the Bulguksa granitic rocks in the Gyeongsan basin < the Bulguksa granitic rocks in the Ogcheon belt and Gyeonggi and Yeongnam massifs and the Daebo granitic rocks in the Ogcheon belt < the Daebo granitic rocks in the Gyeonggi and Yeongnam massifs. This order corresponds to an increase in solidification depth.

    Original languageEnglish
    Pages (from-to)281-295
    Number of pages15
    JournalResource Geology
    Volume62
    Issue number3
    DOIs
    Publication statusPublished - 2012 Jul

    Fingerprint

    solidification
    petrogenesis
    Solidification
    Jurassic
    Rocks
    Cretaceous
    rock
    hydrothermal deposit
    partial melting
    Melting
    Deposits
    continental crust
    basin
    Ferrosoferric Oxide
    Fractionation
    ilmenite
    hornblende
    lower crust
    magnetite
    biotite

    Keywords

    • Biotite
    • Bulguksa granitic rocks
    • Daebo granitic rocks
    • Hornblende
    • Hydrothermal mineralization
    • Solidification depth
    • South korea

    ASJC Scopus subject areas

    • Geology
    • Geochemistry and Petrology

    Cite this

    Petrogenesis and Solidification Depth of the Jurassic Daebo and Cretaceous Bulguksa Granitic Rocks in South Korea. / Uchida, Etsuo; Choi, Seon Gyu; Baba, Daisuke; Wakisaka, Yusuke.

    In: Resource Geology, Vol. 62, No. 3, 07.2012, p. 281-295.

    Research output: Contribution to journalArticle

    Uchida, Etsuo ; Choi, Seon Gyu ; Baba, Daisuke ; Wakisaka, Yusuke. / Petrogenesis and Solidification Depth of the Jurassic Daebo and Cretaceous Bulguksa Granitic Rocks in South Korea. In: Resource Geology. 2012 ; Vol. 62, No. 3. pp. 281-295.
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    AB - We investigated the Jurassic Daebo and Cretaceous Bulguksa granitic rocks in South Korea. The former are distributed mainly in the Gyeonggi and Yeongnam massifs and the latter are present in the Gyeongsan basin and Ogcheon belt. The Daebo granitic rocks generally are of ilmenite series and I to S type. These rocks are associated with Au-Ag hydrothermal deposits, whereas the Bulguksa granitic rocks are of magnetite series and I type, and are associated with Pb-Zn, Cu and Mo-W hydrothermal deposits, as well as Au-Ag hydrothermal deposits. The Daebo granitic rocks show adakitic signatures in their chemical compositions. They are considered to have been derived from partial melting of the thick lower continental crust. Conversely, the Bulguksa granitic rocks in the Gyeongsan basin are non-adakitic and are considered to have been derived from partial melting of a mantle wedge. Magmas of the Daebo granitic rocks formed at relatively shallow levels, but solidified at deep levels compared with those of the Bulguksa granitic rocks. The Bulguksa granitic rocks in the central to western Ogcheon belt are considered to have been formed by fractionation of magmas derived from partial melting of continental crust. The total Al contents of biotite and hornblende in the granitic rocks increased, with the Bulguksa granitic rocks in the Gyeongsan basin < the Bulguksa granitic rocks in the Ogcheon belt and Gyeonggi and Yeongnam massifs and the Daebo granitic rocks in the Ogcheon belt < the Daebo granitic rocks in the Gyeonggi and Yeongnam massifs. This order corresponds to an increase in solidification depth.

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    KW - Hornblende

    KW - Hydrothermal mineralization

    KW - Solidification depth

    KW - South korea

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