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The Unsolved Mysteries of Petrology
Transcript of The Unsolved Mysteries of Petrology
Origin of the trachyte-quartz trachyte-peralkalic rhyolite suite of the Oligocene Paisano volcano, Trans-Pecos Texas by Don F. Parker
Growth rate of alkali feldspars in decompression-induced crystallization experiments in a trachtic melt of the Phlegraen fields (Napoli, Italy) by Marta Calzolaio, Fabio Arzilli, and Michael R. Carroll.
So I read them and took notes. I learned a lot about how trachytic magmas form. Trachytic magmas can come from three different sources. (1) hydrous basaltic magmas
(2) basaltic magma
(3) continental crust These magmas, however, cannot just magically become a trachytic magma. At least without Fractional Crystallization In both the study in Hawaii and the study in Texas the magma that erupted pooled and then underwent fractional crystalization and then became a tracytic magma. Magnetite inside a masked green grain Alkali phenocryst surrounded by the masked green mineral. Trachytic texture as it flows around the green mineral. Alkali feldspar phenocryst showing zoning. This is an example of how trachytic magmas formed in Hawaii. So I decided to make a poster of my project. Attempt one... Attempt two... Much better The End (Cousens et al., 2003) My Sample