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quartz porphyry

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quartz porphyry [′kwȯrts ′pȯr·fə·rē]
(petrology)
A porphyritic extrusive or hypabyssal rock containing quartz and alkali feldspar phenocrysts embedded in a microcrystalline or cryptocrystalline matrix. Also known as granite porphyry.
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The different zones are strong propylite, argillic, sericitic and potassic (biotite) alteration hosted in a biotite, feldspar quartz porphyry.
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Intruding this is quartz porphyry dikes and sills which has a coarsely crystalline phase and a finer grained phase occurring in the margin of the intrusions perhaps as "chill margin" phenomena.
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