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Showing 1 to 10 of 10 for “"komatiite"”.
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Cooling and crystallization of komatiite flows.
Despite their $\sim$2710 Ma age, thin komatiite lava flows in Munro township, NE Ontario have sufficiently well-preserved primary structures, textures, mineralogy, and whole-rock geochemistry to constrain the physical processes of cooling and crystal growth. Seawater convection drove a cooling and …
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Geochemistry and petrogenesis of unaltered and altered volcanic sequences in the southern Abitibi greenstone belt
… belt, there are numerous, well preserved, komatiite-tholeiite sequences in fault-bounded tectonostratigraphic terranes, or "assemblages". Volcanism commenced at 2750 Ma and terminated at $\sim$2700 Ma. New analyses of relatively fresh komatiites by ICP-MS from the classical Pyke Hill …
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Petrology and geochemistry of high degree mantle melts
… melts of the mantle, with particular focus on komatiites from the Barberton Mountainland, South Africa. Chapter 1 presents experiments on a Barberton komatiite composition under anhydrous and H20 saturated conditions. A comparison of the compositions of augite in the experiments with augite in …
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Characterization of pentlandite-bearing quartz veins of Kambalda, Western Australia
… orebodies in 1966. The Ni orebodies consist of komatiite-associated magmatic sulfide deposits which have experienced deformation, metamorphism and plutonism. A complex geologic history at the Kambalda Dome has resulted in the formation of various types of cross-cutting quartz veins that have not …
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The partial molar volume of carbon dioxide in peridotite partial melt at high pressure
… CO2 (VCO2) in silicate melt was determined for a komatiite composition using high pressure sink/float experiments in a multi-anvil press. The density of the experimental melt at pressure was determined by observing sinking and floating of pure forsterite (Fo100) and 90% forsterite (Fo90) buoyancy …
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Structural, stratigraphic and geochemical studies of the Horwood Peninsula - Gander Bay Area, Northeast Newfoundland /
… subdivided into three rock suites : (a) basaltic komatiite (Beaver Cove Assemblage), (b) tholeiitic basalt (diabase dikes), (c) alkaline basalt (Shoal Bay Assemblage). The high Ti02 , MgO, Ni contents and bimodal characteristic of the basaltic komatiite in the area are comparable to the Svartenhuk …
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Characterization of the mineralized albitite bodies at Biggejavri, Kautokeino Greenstone Belt, Finnmark, Northern Norway
… that the high Mg amphibolite, formerly a komatiite, is highly enriched in elements such as Ni and Cr, the felsic albitite lenses within the high Mg amphibolite show enrichment in elements such as Ti, V, and REEs. During metamorphism, the aforementioned elements were released into the …
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Structural Style and Regional Comparison of the Paleoproterozoic Ketyet River Group in the Region North-Northwest of Baker Lake, Nunavut
… group ranging from feldspathic metagreywacke to komatiite. Where the metaconglomerate is absent, the base of the orthoquartzite contains “quartz eyes” resembling those of the QFP schist. Cross-beds at the base and top of the orthoquartzite respectively face away from the QFP schist and toward the …
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Trace Element Geochemistry of Volcanogenic Massive Sulfide Deposits in Archean Greenstone Belts: Implications for Metal Endowment and Geodynamic Settings
… In, Ga, Sn, Hg, and Tl compared to basalt and komatiite, which have higher Cu, Co, Ni, and Se. The variation in trace element concentrations in pyrite is remarkably consistent for different deposits. We note that randomly sampled pyrite from almost any part of a deposit with a bulk enrichment …
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Geobarometry, phase relations and elasticity of eclogite under conditions of Earth’s upper mantle
… including mid-ocean ridge basalts, kimberlite, komatiite and peridotite bulk compositions were included in the calibration covering pressures from 6 to 20 GPa and temperatures from 900 to 2200 °C. Applying the geobarometer to natural majoritic diamond inclusions reveals clearly that eclogitic …