Abstract
True rhyolites are found in two contrasting occurrences in Central America: in recent obsidian domes in the basalt-rhyolite association of southeastern Guatemala, and in late Tertiary ignimbrites in Honduras and adjacent parts of Nicaragua. Both are on the inner side of the main volcanic axis in a region that is visibly underlain by older metamorphic and plutonic rocks. They have not been found in southern Central America where the basement series consists only of older volcanic rocks, eugeosynclinal sediments, and peridotite.
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