Results 1 to 10 of about 113 (110)
Cordierite-spinel-quartz assemblages: A potential geobarometer [PDF]
Bulletin of the Geological Society of Finland, 1986 The composition of (Mg-Zn-Fe+2)-aluminate-spinel coexisting with cordierite and quartz is potentially a sensitive geobarometer in rock types such as cordierite ‒ anthophyllite rocks which are not well suited to most other geobarometers. Calculations based on thermodynamic data and the end member reactions demonstrated that the compositions of (Mg-Fe) ‒
F. Seifert, J.C. Schumacher
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Geochemistry, mineral chemistry and pressure–temperature conditions of the Jõhvi magnetite quartzites and magnetite-rich gneisses, NE Estonia [PDF]
Estonian Journal of Earth Sciences, 2021 The Jõhvi magnetite quartzites (MagQ) occur as subvertical beds with a complicated structural outline in biotite-garnet-cordierite and pyroxene gneisses which in places also contain high concentrations of iron. Drill core study shows that the complex of
Alvar Soesoo +3 more
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The Polumir granite: Addititional data on its origin [PDF]
Geološki Anali Balkanskoga Poluostrva, 2002 The Polumir granite is exposed on several localities due to erosion, and its chemical and mineral composition is presented in this paper. It is built of K-feldspar, plagioclase, myrmekite, metasomatic albite, biotite, muscovite and quartz, while apatite,
Vukov Milenko S., Milovanović Dragan
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Frontiers in Earth Science, 2022 The pyrope (Prp)–almandine (Alm) solid solutions are the most fundamental garnet components on the Earth, and both the quartz inclusions in garnet (QuiG) barometry and the garnet inclusions in diamond barometry need to be constrained by the thermoelastic
Bo Li +14 more
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PT-conditions of deformation within the Palaeoproterozoic South Finland shear zone: Some geothermobarometric results [PDF]
Bulletin of the Geological Society of Finland, 2005 Four rock samples were collected from the crustal-scale South Finland shear zone in order to compare PT-conditions of deformation between gneissose and mylonitic rock types.
T. Torvela, H. Annersten
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Structural and rheological evolution of the Laramide subduction channel in southern California [PDF]
Solid Earth, 2017 The Pelona Schist in the San Gabriel Mountains, southern California, formed in the Laramide subduction channel, exhibits multiple phases of deformation/metamorphism and provides valuable insights into the rheological properties of the subduction channel.
H. Xia, J. P. Platt
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Earth and Planetary Science Letters, 2016 Abstract A temperature-composition diagram has been constructed for the system MgSiO3 FeSiO3 at 1 atm, using a combination of experimental data obtained at 1100 and 1250° and thermodynamic calculations. From the information contained in thisT-X diagram, and that provided by experimental work on theP-T stability field of orthoferrosilite, and by ...
Wood, B, Strens, R
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Titanium in phengite: a geobarometer for high temperature eclogites [PDF]
Contributions to Mineralogy and Petrology, 2009 ISSN:0010 ...
Auzanneau, E. +3 more
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The potential use of OH-defects in enstatite as geobarometer [PDF]
Contributions to Mineralogy and Petrology, 2011 In this study, single crystals of pure enstatite (Mg2Si2O6) were synthesised under water-saturated conditions at 4 and 8 GPa and 1,150°C with variable silica activity, leading to phase assemblages enstatite + forsterite, enstatite or enstatite + coesite.
Prechtel, Felix, Stalder, Roland
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Ankaramite from Tenerife: a novel geothermobarometric approach to gain insights into the depth of a magma plumbing system [PDF]
European Journal of MineralogyThis study investigates the magma plumbing system of the Miocene volcano shield stage of Tenerife (Canary Islands) through a geothermobarometric analysis of clinopyroxenes in ankaramite dykes and lavas from the Teno and Roque del Conde massifs ...
L. Barni +7 more
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