SpringerImages - Illustration summarizing inferred processes and possible structure of the magmatic system below the Farallón Negro Volcanic Complex. Based on melt inclusion data and phase equilibria, we suggest that the most mafic magma is water saturated at 1,000 °C and 350 MPa. This magma is mixed with a silica-rich magma in a gradually developing reservoir at approximately 950 °C and 250 MPa. During mixing, the magma saturated a fluid phase, which triggered eruption through the main volcanic conduit. Sulfide saturation occurred at the same time in parts of the magma reservoir from which subvolcanic intrusions were derived/extracted. Further degassing during ascent in the volcanic conduit was responsible for the replacement of amphibole by pyroxene and plagioclase at 150 MPa. Successive intrusions of progressively more mafic magmas in a single stock suggest that the magma chamber was layered

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Illustration summarizing inferred processes and possible structure of the magmatic system below the Farallón Negro Volcanic Complex. Based on melt inclusion data and phase equilibria, we suggest that the most mafic magma is water saturated at 1,000 °C and 350 MPa. This magma is mixed with a silica-rich magma in a gradually developing reservoir at approximately 950 °C and 250 MPa. During mixing, the magma saturated a fluid phase, which triggered eruption through the main volcanic conduit. Sulfide saturation occurred at the same time in parts of the magma reservoir from which subvolcanic intrusions were derived/extracted. Further degassing during ascent in the volcanic conduit was responsible for the replacement of amphibole by pyroxene and plagioclase at 150 MPa. Successive intrusions of progressively more mafic magmas in a single stock suggest that the magma chamber was layered

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This evolution includes an initial build-up of a volcanic edifice over 2 million years, the gradual establishment of an internally structured magma chamber, and the final crystallization of this magma reservoir (Fig. 10 ).

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