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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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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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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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The current status of thermobarometry in metamorphic rocks
Geological Society, London, Special Publications, 1989SummaryInformation on pressure (P) and temperature (T) is a fundamental aspect of research on metamorphic terrains. Unfortunately, many workers employ thermobarometers that are not experimentally calibrated, are insensitive or too sensitive toP-Tchanges, depend on a priori assumptions of water pressure (such as most petrogenetic grids), or are rapidly ...
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Micro-XANES determination of ferric iron and its application in thermobarometry
Lithos, 2003Micro-X-ray absorption near-edge structure (XANES) analysis was employed to determine the content of ferric iron in minerals formed in ultrahigh-pressure (UHP) eclogites. It is observed that omphacite and phengite contain significant amounts of Fe3+/Fetot (0.2–0.6), whereas only very low contents are present in garnet (Fe3+/Fetot=0.0–0.03), the latter ...
Schmid, R. +7 more
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GEOTHERMS OF CONTINENTAL LITHOSPHERE BASED ON XENOLITH THERMOBAROMETRY
International Geology Review, 1993The thermobarometry of garnet lherzolite and pyroxenite xeno-liths from kimberlitic explosion pipes and volcanoes has been used to determine the geotherms, values of the surface heat flow, and the thickness of the lithosphere in regions of Archean orogeny (the Kaapvaal Craton, South Africa and Lesotho, and the Siberian Platform in the vicinity of the ...
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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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Thermal and kinetic constraints on the tectonic applications of thermobarometry
Mineralogical Magazine, 1991AbstractMetamorphic petrology, and in particular quantitative thermobarometry, offer the possibility of identifying faults in metamorphic terrains by the metamorphic and/or thermobarometric breaks that occur across them. Furthermore, the sense of the thermobarometric break (e.g.
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On the interpretation of TitaniQ and ZiR thermobarometry in subduction complexes
Contributions to Mineralogy and Petrology, 2023Frank S. Spear +2 more
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