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More model informationPhenocrysts (and megacrysts) of potassium feldspar dominate the biotite-rich porphyritic 89Ma Topaz Lake granodiorite. Part of the Sonora Pass Intrusive Suite, this rock represents the frozen remnants of a magma chamber that once fed an Andean-style volcanic arc in what is now eastern California. Sample collected near Sonora Pass, CA at the confluence of Blue Canyon and Deadman Creeks.
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