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  DigitalCC

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5 hits

  • Thumbnail for 74
    74

    Composed mainly of a variably textured aggregate of antigorite and talc. Some parts are mainly fine interlaces of serpentine; others consist of both serpentine and talc completely intertwined and still other parts are mainly talcose. Veinlets and bands of these minerals, together with some carbonate are widespread. There is also considerable carbonate which appears in two types of two distinct ages 1) corroded patches of an older turbid carbonate and 2) veinlets of a younger, clear magnesite. Streaks and patches of fine-grained magnetite are common throughout.

  • Thumbnail for KBR2
    KBR2

    The dominant texture in this gabbro is an ophitic intergrowth of equant plagioclase laths within larger, subhedral, clinopyroxene grains. Alteration of some phases to chlorite, talc and iddingsite is localized and occurs more in non-ophitic sections of the rock.

  • Thumbnail for KBR1
    KBR1

    The dominant texture in this gabbro is an ophitic intergrowth of equant plagioclase laths within larger, subhedral, clinopyroxene grains. Alteration of some phases to chlorite, talc and clays is localized and occurs more in non-ophitic sections of the rock.

  • Thumbnail for JPN-20
    JPN-20

    Interpenetrating zones of optically-continuous, pebbly-textured olivine, fibrous serpentine, and radiating talc. This thin section has interfingered scaly and fibrous textures.

  • Thumbnail for JPN-14
    JPN-14

    Texturally, this thin section still resembles a gabbro, with the exception of several talc and serpentine filled veins cross cutting the otherwise equigranular mosaic of clinopyroxene and olivine.