Results 131 to 140 of about 286 (180)
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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 ...
Roger Powell
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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 ...
Roger Powell
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High-precision relative thermobarometry: theory and a worked example
Journal of Metamorphic Geology, 2000A number of sources of uncertainty are involved in thermobarometric calculations, the most important of which are associated with analytical precision, activity–composition (a–x) relationships, and thermodynamic data. Statistical treatment of these uncertainties results in relatively large uncertainties on the calculated values of pressure and ...
null Worley, null Powell
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Machine Learning Thermobarometry for Biotite‐Bearing Magmas
Journal of Geophysical Research: Solid Earth, 2022AbstractBiotite (sensu lato) is a widespread rock‐forming mineral in magmatic rocks that can be stable in a broad range of pressure and temperature, but appropriate biotite thermometers or barometers are lacking. Based on a collected experimental dataset (n = 839, T = 625–1,325°C, P = 1–48 kbar) containing biotites that span a wide compositional range [
Xiaoyan Li, Chao Zhang
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A Windows program for pyroxene-liquid thermobarometry
Periodico di Mineralogia, 2018A Windows program (WinPLtb) has been developed to calculate wet–chemical and microprobe pyroxene analyses based on the standard International Mineralogical Association (IMA-88) nomenclature scheme. The program allows the user to enter clinopyroxene, orthopyroxene and associated composition of liquid or whole-rock and some calculated components in the
Yavuz, Fuat, Yıldırım, Demet Kıran
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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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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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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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The Granulite Uncertainty Principle: Limitations on Thermobarometry in Granulites
The Journal of Geology, 1989There are three geothermometers based on reversed experimental data and applicable to granulites: the two-pyroxene, two-oxide, and garnet-clinopyroxene thermometers. All have apparent closure temperatures below those of the granulite facies. This casts significant doubt on the concept that "peak" temperatures are routinely obtained from ion-exchange ...
B. Ronald Frost, Thomas Chacko
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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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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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