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- W2580487233 abstract "The Dutchmans Creek gabbro is a differentiated pluton consisting of olivine gabbro, anorthositic gabbro, pyroxene gabbro, and hornblende-pyroxene gabbro. This sequence of rock types represents advancing differentiation, as indicated by progressive increaie in Fel (Fe+Mg) ratios of coexisting ferromagnesian minerals and decrease in the anorthite component of plagioclase. Modal olivine decreases systematically in the sequence. The parent magma crystallized under conditions of high PHrO and./Cr, which increased with fractionation, as suggested by modal increase in hydrous minerals and changes in the compositions of opaque minerals. Late-magmatic reactions occurred between many mineral phases and produced a variety of symplectic or replacement textures. Petrologic differences between the Dutchmans Creek gabbro and other neighboring plutons include early precipitation of Fe-Ti oxides, absence of olivine reaction relationships, and systematic areal distribution of olivine within the pluton. These differences may be due to the fact that much of the pluton has barely been unroofed by erosion, and only the upper regions of the magma chamber are visible. Early cumulate rocks are exposed in the pluton interior due to deeper erosion, whereas late differentiates outcrop at higher topographic levels at pluton margins. Water migration to the top of the chamber may have resulted in higher prevailing.lO, and subsequent lowering of liquidus temperatures in the upper volatile-rich portions of the chamber." @default.
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- W2580487233 date "1979-06-01" @default.
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- W2580487233 title "Mineralogy and petrology of the Dutchmans Creek gabbroic intrusion, South Carolina" @default.
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