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Showing 1 to 7 of 7 for “"Sapphirine"”.
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Textural and Chemical Relations Among Spinel-Sapphirine-Garnet-Orthopyroxene, Salt Hill Emery Mine, Cortlandt Complex, N.Y.
… of product silicates in stages, e.g., spinel – sapphirine (Si/O=0.10), sapphirine – garnet (0.25), garnet – orthopyroxene (0.28), rather than directly from spinel to higher-silica minerals which would overstep intermediate reaction steps. However, observed reaction textures indicate the latter …
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Integrating in situ Geochronology and Metamorphic Petrology: An Example from the Gruf Complex, European Central Alps
… to elucidate the P-T-time (P-T-t) evolution of sapphirine-bearing granulites from the Gruf Complex in the Central Alps. Two main questions are addressed: (1) When did the Gruf Complex experience UHT metamorphism? (2) What parts of the P-T evolution of high-grade metamorphic rocks can be dated …
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Petrological and geochronological constraints on the metamorphic evolution of high-pressure granulites and eclogites of the Snowbird tectonic zone, Canada
… the Southern Domain - mafic granulite, eclogite, sapphirine granulite, and felsic granulite. The approach that is taken in understanding each of these rock types is an integrated study of the petrological and geochronological constraints that yield important information about the metamorphic …
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Metamorphic evolution of ultrahigh-temperature granulite facies and upper amphibolite facies rocks of the Epupa Complex, NW Namibia
… are intercalated in the metavolcanites. Sapphirine-bearing MgAl-rich gneisses occur as restitic schlieren in the migmatitic metagreywackes. Reconstructed anti-clockwise P-T paths are subdivided into several distinct stages: During prograde near-isobaric heating to UHT conditions at c. 7 …
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Evaluating the Usefulness of Geochronometers in the Packsaddle Domain for Refining the Timing of Metamorphism Via High-Resolution Petrography, Enchanted Rock State Natural Area, Llano Uplift, Texas
<p>The Llano uplift, central Texas, exhumes Mesoproterozoic rocks with a complex history of metamorphism, deformation, and magmatism. There are three recognized metamorphic events related to the Grenville orogeny (~1.3-0.9 Ga). The timing of these metamorphic events is not well resolved due to past …
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High-temperature metamorphism in the western Namaqua-Natal Metamorphic Province (South Africa): implications for low-pressure granulite terranes
… to peak conditions. Monomineralic coronae of sapphirine developed during near-isobaric cooling at the expense of previously-formed symplectites. Detailed investigation of a conformable sequence of sedimentary and mafic granulites from the locality Hytkoras in central Bushmanland reveal a …
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High-temperature metamorphism in the western Namaqua-Natal Metamorphic Province (South Africa): implications for low-pressure granulite terranes
… to peak conditions. Monomineralic coronae of sapphirine developed during near-isobaric cooling at the expense of previously-formed symplectites. Detailed investigation of a conformable sequence of sedimentary and mafic granulites from the locality Hytkoras in central Bushmanland reveal a …