Results 151 to 160 of about 1,086 (189)

Clinopyroxene–Liquid Equilibria and Geothermobarometry in Natural and Experimental Tholeiites: the 2014–2015 Holuhraun Eruption, Iceland [PDF]

Journal of Petrology, 2019
Clinopyroxene–liquid geothermobarometry is a widely used tool for estimating the conditions under which mafic magmas are stored before they erupt. However, redox variability, sector zoning and disequilibrium crystallisation present major challenges to ...
Maren Kahl, David A. Neave, Eniko Bali
exaly   +2 more sources

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GARNET-ORTHOPYROXENE AND GARNET-AMPHIBOLE GEOTHERMOBAROMETRY: EXPERIMENTAL DATA AND THERMODYNAMICS

International Geology Review, 1990
L L Perchuk
exaly   +2 more sources

Elastic geothermobarometry on multiple inclusions in a single host

2020
<p>The characterization of the pressure and temperature (P-T) histories of subducted rocks is of key importance to unravel geological processes at all scales. Conventional element-exchange geothermobarometers are challenged in ultra-high-pressure metamorphic terranes as the subduction temperatures may exceed their closure ...
Mattia Gilio, Matteo Alvaro, Ross Angel, Marco Scambelluri   +3 more
openaire   +1 more source

Geothermobarometry of the Central Crystallines from the Garhwal Himalaya

Journal Geological Society of India, 1988
Abstract Pelitic schists, gneisses and amphibolites from the Central Crystallines of the Garhwal Himalaya display evidence of multiple deformation (D1, D2 and D3) and polymetamorphism (M1, M2 and M3)' During the M1 episode of regional metamorphism which represents a thermal peak, the pelitic schists and gneisses developed the assemblage:
V. K. Gairola, D. Ackermand
openaire   +1 more source

SCG: A Computer Applicationfor Single Clinopyroxene Geothermobarometry

Italian Journal of Geosciences, 2014
SCG stands for Single Clinopyroxene Geothermobarometry, a software application for clinopyroxene geothermobarometry introduced here for the first time to the scientific community along with an explanatory note. SCG is a highly specialised and user-friendly application.
Sayari, Mohammad, Sharifi, Mortaza
openaire   +1 more source

An analysis of uncertainty in non‐equilibrium and equilibrium geothermobarometry

Journal of Metamorphic Geology, 2004
AbstractIn statistically optimised P–T estimation, the contributions to overall uncertainty from different sources are represented by ellipses. One source, for a diffusion‐controlled reaction at non‐equilibrium, is diffusion modelling of the reaction texture.
J. R. ASHWORTH, V. S. SHEPLEV, V. V. KHLESTOV, V. A. ANANYEV   +3 more
openaire   +1 more source

Geothermobarometry of high-grade metapelites: simultaneously operating reactions

Geological Society, London, Special Publications, 1989
Summary Experimental data on equilibria involving rock-forming minerals in high-grade metapelites (garnet, orthopyroxene, cordierite and plagioclase) have been used to derive an internally consistent system of mineralogical thermometers and barometers based on component reactions and excess mixing properties of solid solutions ...
L. Ya. Aranovich, K. K. Podlesskii
openaire   +1 more source

Metapelitic Garnet-Muscovite-Al2SiO5-Quartz (GMAQ) Geothermobarometry

Journal of Earth Science, 2018
The garnet-muscovite geothermometer and garnet-muscovite-Al2SiO5-quartz (GMAQ) geobarometer have been empirically calibrated under P-T conditions of 1–12 kbar and 460–760 oC using natural metapelitic rocks. The chemical compositions of the calibrant muscovite are in the ranges of Fe=0.03–0.21 atoms, Mg=0.02–0.32 atoms and AlVI=1.62–1.96 atoms ...
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Geothermobarometry of Al2SiO5-bearing metapelites in the western Austroalpine �tztal-basement

Mineralogy and Petrology, 1996
The dominant amphibolite-facies Variscan event in the Austroalpine Otztal basement can best be studied in the northwestern part of the Otztal block. Further to the southeast it is overprinted by Alpine metamorphism. Metapelites with the assemblage garnet-staurolite-kyanite-sillimanite±andalusite-biotite-muscovite-plagioclase were used to reconstruct ...
P. Tropper, G. Hoinkes
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Geothermobarometry of the Northwestern Margin of the Superior Province: Implications for Its Tectonic Evolution

The Journal of Geology, 1986
Geothermometry and geobarometry of orthogneisses and metasediments across the Pikwitonei granulite facies domain of central Manitoba shows an increase of paleopressure from about 6 kbar near the orthopyroxene isograd on the east to 12 kbar near the western boundary against the Thompson Nickel Belt.
A. Dog̃an Paktunc, Alec J. Baer
openaire   +1 more source