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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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American Mineralogist, 2020
Central aims of IODP Expedition 352 were to delineate and characterize the magmatic stratigraphy in the Bonin forearc to define key magmatic processes associated with subduction initiation and their potential links to ophiolites.
S. Whattam +13 more
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Central aims of IODP Expedition 352 were to delineate and characterize the magmatic stratigraphy in the Bonin forearc to define key magmatic processes associated with subduction initiation and their potential links to ophiolites.
S. Whattam +13 more
semanticscholar +1 more source
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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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 ...
Powell, Worley
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, 2020
A comparative analysis of Raman shifts of quartz inclusions in garnet was made along two traverses across the Connecticut Valley Trough (CVT) in western New England, USA, to examine the regional trends of quartz inclusion in garnet (QuiG) Raman ...
Oliver M. Wolfe, F. Spear
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A comparative analysis of Raman shifts of quartz inclusions in garnet was made along two traverses across the Connecticut Valley Trough (CVT) in western New England, USA, to examine the regional trends of quartz inclusion in garnet (QuiG) Raman ...
Oliver M. Wolfe, F. Spear
semanticscholar +1 more source
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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Relative thermobarometry and metamorphic P-T, paths
Geological Society, London, Special Publications, 1989Summary Relative thermobarometry involves the determination of changes in P and T experienced by a rock through analysis of mineral zoning, inclusion suites and reaction textures. For this purpose, the differential forms of the thermodynamic equations and mass balance constraints ...
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Empirical evaluation of solution models for pelitic minerals and their application to thermobarometry [PDF]
Contributions to Mineralogy and Petrology, 1994 One of the major sources of uncertainty for thermobarometry in pelitic rocks is the inability of solution models to represent accurately the non-ideal behavior of important pelitic minerals, in particular garnet, biotite, and plagioclase. In recent years, a large number of different solution models have been proposed for these phases.
Kip V. Hodges, J.D.R. Applegate
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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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Clinopyroxene in postshield Haleakala ankaramite: 1. Efficacy of thermobarometry
Contributions to Mineralogy and Petrology, 2015Magma storage depth is a fundamental aspect of a volcano’s magmatic plumbing system that may be resolved using mineral-melt thermobarometry, assuming crystal growth occurs at near-equilibrium conditions. We acquire major and minor element compositional analyses of whole rock, groundmass separates, and clinopyroxene in ankaramite erupted ca.
Benoit Welsch +4 more
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