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Vitrophyre Rhyolite in Valles Caldera
Vitrophyre Rhyolite is a type of igneous rock found in the Sante Fe and Valles Caldera areas of New Mexico (see map). Rhyolites are the extrusive equivalents of the plutonic rocks and hence the Rhyolite outcrops closely resemble granite formations. They are composed of high content of Silica and low in iron and magnesium. The Rhyolite melts are intensely polymerized and their lavas are very viscous. The Rhyolites are also known to occur in volcanic plugs and dykes. Figure 1. The cross sections and the geological maps of ...