Results 181 to 190 of about 910 (212)
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Journal of Metamorphic Geology, 2008
AbstractThermobarometry, the estimation of the pressure–temperature (P–T) conditions of metamorphism, can be undertaken by using pseudosection calculations as well as by conventional methods. Conventional thermobarometry uses only the equilibrium thermodynamics of balanced reactions between end‐members of minerals, combined with the observed ...
R. POWELL, T. J. B. HOLLAND
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AbstractThermobarometry, the estimation of the pressure–temperature (P–T) conditions of metamorphism, can be undertaken by using pseudosection calculations as well as by conventional methods. Conventional thermobarometry uses only the equilibrium thermodynamics of balanced reactions between end‐members of minerals, combined with the observed ...
R. POWELL, T. J. B. HOLLAND
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Thermobarometry in granulites: pitfalls and new approaches
Precambrian Research, 1992Abstract Computer models of cooling granulite-facies rocks with the assemblage garnet+biotite+sillimanite+K-feldspar±plagioclase+quartz are presented that incorporate simultaneous reaction (net transfer and exchange) and multicomponent diffusion in garnet.
Frank S. Spear, Frank P. Florence
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Single-pyroxene thermobarometry
Tectonophysics, 1980Abstract Enstatites in peridotites from the Vourinos ophiolites, Greece, have exceptionally high Cr/Al ratios, though the pyroxenes are in equilibrium with picotite. Phase-chemistry data yield new empirical relations for the critical effect of Cr on Al solubility, in full agreement with local Cr/Al ratio variations observed in some massifs. These new
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Thermodynamic Modeling and Thermobarometry of Metasomatized Rocks
2012Determining the P-T conditions at which metasomatism occurs provides insight into the physical conditions at which fluid-rock interaction occurs in the crust. However, application of thermodynamic modeling to metasomatized rocks is not without pitfalls.
Goncalves, Philippe +3 more
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Status of thermobarometry in granitic batholiths
Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 1996ABSTRACT:Most granitic batholiths contain plutons which are composed of low-variance mineral assemblages amenable to quantification of the P– conditions that characterise emplacement. Some mineral thermometers, such as those based on two feldspars or two Fe–Ti oxides, commonly undergo subsolidus re-equilibration.
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Fluid Inclusion Thermobarometry as a Tracer for Magmatic Processes
Reviews in Mineralogy and Geochemistry, 2008Fluid inclusions in minerals may form in any type of volcanic or plutonic rock ranging from mafic to silicic compositions. Because all igneous rocks reach fluid saturation at some stage during their evolution, fluids trapped as inclusions in magmatic minerals belong to a certain paragenesis or phase assemblage, which may include minerals, melts and one
T. H. Hansteen, A. Klugel
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Orthopyroxene thermobarometry in simple and complex systems
Contributions to Mineralogy and Petrology, 1987In the system FeO-MgO-Al2O3-SiO2 (FMAS), the equilibrium Al-content of orthopyroxene coexisting with olivine and spinel was reversed in 18 experiments at 1 340° C and 11 or 18 kbar, using graphite capsules and PbO flux. In the CFMAS system (+CaO), the Al-contents of ortho- and clinopyroxene coexisting with olivine and spinel were reversed in 5 ...
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WinAmptb: A Windows program for calcic amphibole thermobarometry
Periodico di Mineralogia, 2017WinAmtb is a Microsoft ® Visual Basic software developed for electron microprobe calcic amphibole analyses to calculate the pressure ( P ), temperature ( T ) and oxygen fugacity ( f O 2 ) conditions of amphibole-bearing alkaline to calc-alkaline rocks. The program estimates the structural formulae of calcic group amphibole analyses on the basis of IMA-
Yavuz, Fuat, Döner, Zeynep
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2009
Quantitative thermobarometers require selection of a univariant reaction, consideration of dilutions in all phases and application to fully buffered systems. Empirical thermobarometers include AlIV in chlorite, Al in hornblende, Ti in biotite, phengite barometry and various clay and organic transformations.
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Quantitative thermobarometers require selection of a univariant reaction, consideration of dilutions in all phases and application to fully buffered systems. Empirical thermobarometers include AlIV in chlorite, Al in hornblende, Ti in biotite, phengite barometry and various clay and organic transformations.
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THERMOBAROMETRY OF XENOLITHS FROM DEEP-SEATED ROCKS
International Geology Review, 1993A system of two-pyroxene thermometry is proposed, based on the distribution coefficients of one and three components between coexisting orthopyroxenes and clinopyroxenes and the position of the orthopyroxene isotherm-isobars in the ternary system MgSiO3-CaSiO3-FeSiO3.
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