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1974
Basalts and pyroxene-andesites comprise by far the largest amount of mafic rocks and greatly predominate over their plutonic equivalents. Basalts and andesites are widespread in most geosynclines in the forms of lava flows, pillow lavas, tuff layers, sills, and dykes.
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Basalts and pyroxene-andesites comprise by far the largest amount of mafic rocks and greatly predominate over their plutonic equivalents. Basalts and andesites are widespread in most geosynclines in the forms of lava flows, pillow lavas, tuff layers, sills, and dykes.
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Journal of Volcanology and Geothermal Research, 2006
Cas RAF, GIORDANO, Guido
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Cas RAF, GIORDANO, Guido
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Mafic Lower-Mantle Mineral Association
2017Mafic mineral association in the lower mantle is subordinate to the ultramafic one. It includes bridgmanite , CaSi-perovskite , SiO2 and anhydrous aluminous phases . The former three are the same as that observed in the ultramafic association ; but their chemical compositions differ from those in the ultramafic association, mainly in the significant ...
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Anorthosites in Layered Mafic Intrusions
1993Layered mafic intrusions (LMI) may be defined here, with due caution, as differentiated bodies of igneous rock, having broadly gabbroic, noritic, or troctolitic bulk compositions and well developed layering, that have been emplaced into continental crust.4 There is usually a substantial volume of ultramafic rocks, in addition to plagioclase-bearing ...
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Mafic and ultra-mafic enclaves from Ustica island lava: inferences on deep magmatic processes
2005Ustica Island, southern Tyrrhenian Sea, is constituted of Quaternary alkaline volcanics. Avariety of enclaves representative of deep to supra-crustal settings were recently found in a hawaiitic lava flow. Enclaves consist of: (i) Ultramafic meta-cumulates, i.e.
ALLETTI, Marina +2 more
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