Pigeonite-bearing basalts dredged from the Puerto Rico Trench: A microprobe study

Tsugio Shibata

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    A microprobe study was carried out on zoned clinopyroxene, composed of a pigeonite core mantled by augite, and plagioclase in six tholeiitic basalts dredged from the Puerto Rico Trench (20° 06.8′N, 65° 06.5′W). The pigeonite cores are characterized by high magnesium contents [ Fe Fe + Mg = 0.19 on the average]; their crystallization temperatures based on the three-pyroxene geothermometer are thus estimated to be higher than those of the well-studied tholeiitic pyroxene assemblages (Hakone, Weiselberg, Mull, Skaergaard, and Bushveld). It is suggested from textural and chemical relationships that pyroxene crystallization started first with precipitation of pigeonite followed by simultaneous precipitation of pigeonite and augite and finally by crystallization of augite alone in the groundmass.

    Original languageEnglish
    Pages (from-to)285-297
    Number of pages13
    JournalMarine Geology
    Volume30
    Issue number3-4
    DOIs
    Publication statusPublished - 1979

    Fingerprint

    Bearings (structural)
    Puerto Rico
    pigeonite
    Crystallization
    basalt
    trench
    augite
    pyroxene
    crystallization
    plagioclase
    Magnesium
    tholeiitic basalt
    magnesium
    clinopyroxene
    Temperature
    temperature

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geology
    • Geophysics

    Cite this

    Pigeonite-bearing basalts dredged from the Puerto Rico Trench : A microprobe study. / Shibata, Tsugio.

    In: Marine Geology, Vol. 30, No. 3-4, 1979, p. 285-297.

    Research output: Contribution to journalArticle

    Shibata, Tsugio. / Pigeonite-bearing basalts dredged from the Puerto Rico Trench : A microprobe study. In: Marine Geology. 1979 ; Vol. 30, No. 3-4. pp. 285-297.
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    abstract = "A microprobe study was carried out on zoned clinopyroxene, composed of a pigeonite core mantled by augite, and plagioclase in six tholeiitic basalts dredged from the Puerto Rico Trench (20° 06.8′N, 65° 06.5′W). The pigeonite cores are characterized by high magnesium contents [ Fe Fe + Mg = 0.19 on the average]; their crystallization temperatures based on the three-pyroxene geothermometer are thus estimated to be higher than those of the well-studied tholeiitic pyroxene assemblages (Hakone, Weiselberg, Mull, Skaergaard, and Bushveld). It is suggested from textural and chemical relationships that pyroxene crystallization started first with precipitation of pigeonite followed by simultaneous precipitation of pigeonite and augite and finally by crystallization of augite alone in the groundmass.",
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