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rhyodacite |
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rhyodacite [rī′äd·ə‚sīt] (petrology) A group of extrusive porphyritic igneous rocks containing quartz, plagioclase, and biotite phenocrysts in a fine-grained to glassy groundmass composed of alkali feldspar and silica minerals. Also known as dellenite; quartz lattice. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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prospect, hole KW06-01 was drilled vertically to 880 feet and encountered sheared and veined intermediate volcaniclastic andesite country rock and interbedded felsic rhyolite to rhyodacite units. Mineralization is associated with a rhyodacite intrusive rocks and a hydrothermal breccia developed along the contract with andesite tuffs and flows that host the felsic intrusive complex. These stacked, sub-horizontal, high-grade zones occur within a wide, low-grade envelope hosted by rhyodacite tuffs and overlying conglomerates. |
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