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olivine gabbro
Petrography, chemical composition, and age constraints of mafic intrusions from the Mesoproterozoic Soisson Intrusive Suite in the southeastern Churchill Province (Canada)
The Oortsog Peridotite–Troctolite–Gabbro Intrusion, Western Mongolia:New Petrological and Geochronological Constraints
Kiglapait mineralogy V: Feldspars in a hot, dry magma
Whole-rock and mineral chemistry of mafic cumulates from the Low-Ti ophiolite in the southern part of Kahramanmaras, Turkey
Slow cooling of the lowermost oceanic crust at the fast-spreading East Pacific Rise
The reaction mechanism of fluid-induced partial melting of gabbro in the oceanic crust
Results of U-Pb dating of zircon and baddeleyite from the Noril’sk-1 ultramafic-mafic intrusion ( Russia )
Petrology and geochemistry of the Andaman ophiolite: melt–rock interaction in a suprasubduction-zone setting
Geochemical implications of gabbro from the slow-spreading Northern Central Indian Ocean Ridge, Indian Ocean
Petrology of the Early Mesozoic ultramafic-mafic Luchina massif (southeastern periphery of the Siberian craton)
Geochemistry of the Mesoproterozoic intrusive rocks of the Nipigon Embayment, northwestern Ontario: evaluating the earliest phases of rift development
Physical Controls Associated with the Distribution of Sulfides in the Voisey’s Bay Ni-Cu-Co Deposit, Labrador
Genesis of the Marathon Cu-platinum-group element deposit, Port Coldwell alkalic complex, Ontario; a Midcontinent rift-related magmatic sulfide deposit
Paleomagnetism of the Abitibi dyke swarm, southern Superior Province, and implications for the Logan Loop
Low- 18 O Scourie dike magmas from the Lewisian complex, northwestern Scotland
Platinum-group minerals and tellurides from the Geordie Lake Intrusion, Coldwell Complex, northwestern Ontario
Slickrock Mountain consists of two major sills intruded into Upper Cretaceous calcareous sandstone. The sills are an older Eocene quartz syenite approximately 200 m thick and a younger Oligocene alkali olivine gabbro approximately 100 m thick. Smaller mafic dikes and sills are abundant in the area. The quartz syenite contains fayalitic olivine and zoned alkali feldspar with plagioclase cores set in an intergranular ground-mass of anorthoclase, sanidine, quartz, clinopyroxene, magnetite, and apatite. The smaller mafic intrusions commonly contain kaersutite megacrysts and an assemblage of crustal xenoliths that includes coarse-grained gabbro and partially fused feldspathic arenite. Major and trace element data do not support the derivation of the felsic compositions from the mafic ones by simple crystal fractionation at low pressure. The presence of kaersutite megacrysts and partially fused crustal xenoliths in nearby sills and dikes suggests that derivation of the Slickrock quartz syenite from some combination of fractionation and crustal assimilation at elevated p H 2 O is possible. However, trace element concentrations indicate that the syenitic and gabbroic rocks are petrogenetically unrelated.