A low-grade, felsic metavolcanic rock with preserved evidence of its original rhyolitic character
This category is also used for meta-rhyolite.

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U-Pb Isotopic Data and Ages of Zircon from the Manzano Mountains, New Mexico

Uranium-lead isotopic data and the crystallization age of zircon from a metamorphic rock from this area for geochronologic analysis. Data are provided in CSV format.