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Showing 1 to 20 of 21 for “"subsolidus"”.
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The effects of high temperature metamorphic and melting processes on granulite-facies rocks
… compositions suitable for modelling prograde subsolidus evolution. Melt reintegration methodology was applied to a low-pressure granulite assemblage containing unambiguous textural evidence for subsolidus andalusite. Melt reintegration methodology resulted in a bulk composition that stabilised …
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High temperature alkali corrosion kinetics of low expansion ceramics
… composition, temperature and time are presented. Subsolidus phase equilibria in the soda-alumina-titania system were investigated and a tentative subsolidus ternary phase diagram for the low soda portion of this system is presented.
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Processes of felsic melt migration through the mid-crust : evidence from field relations in the central zone of the Damara Belt, Namibia
… presents a snapshot of melt migration through subsolidus, mid-crustal rocks. Outcrops selected for detailed investigation are representative of a variety of mestasedimentary rock types and strain environments, and all contain pervasive and interconnected leucosome networks representative of …
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Petrology and Geochemical Evolution of the East Hill Suite of the Mont Saint-Hilaire Alkaline Plutonic Complex
… 10-10 bar at intrusion down to 10-25 bar subsolidus, and that, owing to non-linearity of oxygen buffers, the 2 fO – T path crossed below QFM early, went above QFM late in the crystallization history and then above HM with cooling. A similar procedure applied to sulfur fugacity generated a …
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Sodium metasomatism and magnesio-riebeckite mineralization in the Wilson Ridge pluton
… pluton formed by Na-metasomatism related to subsolidus hydrothermal alteration involving Na-rich fluids of meteoric origin. Whole-rock geochemistry of samples from zones of hydrothermal amphibole show enrichment of Na2O (>9.6 wt. %) and depletion of K2O (0.15 wt. %) and CaO (2.4 wt. %) …
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Petrogenesis of the Mesoproterozoic anorthosite, syenite and carbonatite suites of NW Namibia and their contribution to the metasomatic formation of the Swartbooisdrif sodalite deposits
… rims of biotite and pargasite. During the subsolidus stage sporadic coronitic garnet-orthopyroxene-quartz assemblages were produced. Thermobarometry studies on amphiboles yield temperatures of 985-950°C whereas the chemical composition of coronitic garnet and orthopyroxene indicate a …
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Kinetic processes of mantle minerals
… from spinel to garnet peridotite facies at subsolidus conditions, because the presence of garnet in melting residues has significant influence to the conclusion drawn from geochemical/geophysical observations. Using an approach that monitors the rate of reaction progresses, the experimental …
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Kinetic processes of mantle minerals
… from spinel to garnet peridotite facies at subsolidus conditions, because the presence of garnet in melting residues has significant influence to the conclusion drawn from geochemical/geophysical observations. Using an approach that monitors the rate of reaction progresses, the experimental …
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Metamorphic and melt-migration history of midcrustal migmatitic gneisses from Nupskapa, The Maud Belt, Antarctica
… occurs in isolated dykelike structures under subsolidus conditions, generally in the upper crust where brittle fracturing of rocks can occur. The details of how and when melt migration changes from a pervasive to focused style are poorly understood, particularly the temperature, pressure and …
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Weakening of ice by magnesium perchlorate hydrate
… north polar layered deposits (NPLD). I conducted subsolidus creep tests on mixtures of ice and magnesium perchlorate hexahydrate (MP6) of 0.02, 0.05, 0.10, and 0.47 volume fraction MP6. I found these mixtures to be increasingly weak with increasing MP6 content. For mixtures with </= 0.10 volume …
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Hypervelocity impacts and the evolution of planetary surfaces and interiors
… buoyancy perturbations in numerical models of subsolidus convection. Among the important results of this work is a relation for the time-scale on which a buoyancy anomaly flattens and spreads before it is halted by convective downflows, as well as a condition that indicates for what …
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Major element and isotopic studies on the James Run/Port Deposit association, Maryland: tectonic analogues and Taconic deformation
… with trondhjemitic affinities and indicate that subsolidus alteration during dynamic metamorphism was minor. Comparison of these data with other tectonic environments suggests their generation by partial fusion of amphibolitic basement. Previous studies have dated magmatic events in the Maryland …
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Role of Li and B bearing fluids in crystallization and alteration of granitic pegmatites, San Diego, California
… in controlling the mineralogy of pegmatites and subsolidus alteration includes two of these pegmatites: the gem-bearing San Diego and the more barren La Posta pegmatite suites. The fluxing properties of Li and B in melt, in particular, may be responsible for increasing water solubility in …
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Ghost granophyre: A new texture with implications for plagiogranite differentiation and Ti-in-Quartz thermometry
… interactions that are hundreds of degrees subsolidus with respect to traditional silicate melts. This work also brings into question the applicability of the Ti-in-Quartz geothermometer—a powerful and widely used tool for estimating crystallization temperatures in silicic igneous …
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Petrology of the Mount Airy granite
… muscovite, sphene, and low-An plagioclase are subsolidus. Alteration of biotite and plagioclase show an early, water-rich fluid evolving into a more CO₂-rich fluid as the rocks cooled. An injection temperature of 700-750°C and pressure of at least 5.5-7 Kbar is consistent with the mineral …
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The Middle Fork Plutonic Complex: a plutonic association of coeval peralkaline and metaluminous magmas in the north-central Alaska Range
… increasingly reduced magmatic conditions; subsolidus oxidation, indicated by mafic mineralogy and cathodoluminescence, is due to magmatic process rather than introduction of external components. Eruptive stratigraphy, as predicted by intrusive history of MFPC, compares favorably with …
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Compositional Analysis of the Martian Meteorites Northwest Africa 6342 and Northwest Africa 10961
… fugacity values for NWA 10961 are FMQ -1.35 at a subsolidus temperature of 904 °C with possible auto-oxidation and degassing during magma crystallization. Spinel-group minerals are observed as chadacrysts in both pyroxene and olivine and at the edge of melt pockets and veins within both of these …
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Experimental technique for studying high-temperature phase equilibria in reactive molten metal based systems
… enabled us to outline the liquidus and the subsolidus equilibria for the ternary Zr-ZrO_2-ZrN phase diagrams. Further research is suggested to develop the microgravity techniques for detailed characterization of high-temperature relations in the reactive, metal based systems.
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The oxygen, carbon & hydrogen isotope geochemistry of the Phalaborwa Complex, South Africa
… 18O values and phlogopite has probably undergone subsolidus exchange or alteration. Magma δ18O values estimated from constituent minerals for pyroxenites (~6.8 to 8.3‰), foskorite (~7.1 & 7.2‰) and carbonatite (~6.5 to 9.0‰) are generally higher than normal mantle magmas. The δ18O value of syenite …
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Synthesis and characterization of mechanically alloyed aluminum-based compounds as high energy density materials
… of Ti and Al. Upon their heating, a number of subsolidus exothermic transitions were detected and assigned to formation of different modifications of Al_3Ti. For alloys with 20 at-% or less of Ti, an endothermic transition was observed around 1170K, which was assigned to the formation of …
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