Results 71 to 80 of about 682 (137)

Sodium partitioning between clinopyroxene and silicate melts

Journal of Geophysical Research: Solid Earth, 1995
We present a quantitative model for Na partitioning between clinopyroxene and silicate melt, applicable in the range 0.1 MPa to 6.0 GPa, 1000–2000°C over a wide span of composition. Our model is derived from the Jadeite melting equilibrium, via the relationship ΔGƒ(P,T) = −RTlnKƒ = RTlnD*Na where ΔGƒ(P,T) is the Gibbs free energy of fusion of Jadeite ...
Blundy, JD, Falloon, TJ, Wood, BJ, Dalton, JA   +3 more
openaire   +1 more source

Electrical Conductivity of Hydrous Ultramafic Melts With Implications for Origin of Low Velocity Layer Atop of the 410 km Seismic Discontinuity

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Low‐velocity layers (LVLs) above the 410‐km discontinuity are commonly attributed to partial melt generated by dehydration melting when hydrous mantle transition‐zone material rises into the upper mantle, where water solubility in nominally anhydrous minerals decreases.
Takashi Yoshino, Longjian Xie
wiley   +1 more source

Grapevine rootstocks in K- and Ca-rich volcanic soils: The effect of mineral assemblage on nutrient uptake efficiency

OENO One
This study examines element mobility in volcanic soils to evaluate the relationships between mineral assemblage and the uptake capacity of rootstocks. The Gravesac rootstock, which appears to have a low capacity to selectively absorb K, Ca, Mg, and Na ...
Mario GAETA, Paula Pacheco, Luca Aldega, Maria Luisa Astolfi, Eugenio Giannessi, Cristina Perinelli   +5 more
doaj   +1 more source

Geochemistry of pillow lavas and their clinopyroxene: ophiolitic mélanges of Nain and Ashin, northeastern Isfahan province

Journal of Economic Geology, 2016
The Nain and Ashin ophiolites are located in northeastern Isfahan province, in western Central-East Iranian Microplate. Pillow lavas are one of the most significant Cretaceous rock units.
Nargess Shirdashtzadeh, Ghodrat Torabi, Ramin Samadi   +2 more
doaj  

An Evaluation of Garnet – Clinopyroxene Geothermometer

The garnet-clinopyroxene pair commonly found in upper amphibolite, granulite, and eclogite facies assemblage, as well as in garnet peridotites serves as a basic tool to estimate the equilibrium temperature for these metamorphic rocks. Several empirical and experimental calibrations for garnet-clinopyroxene thermometers have been proposed in the last ...
Harel Thomas, Haritabh Rana
openaire   +1 more source

The clinopyroxenes of the Otaki dolerite sill

The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 1962
Three clinopyroxenes, separated from main dolerite and dolerite pegmatites of the Otaki sill (tholeiite series), Yamagata Prefecture, have been chemically analysed and optically determined. These pyroxenes are an augite (Wo36 En41 Fs23) and two subcalcic ferroaugites (Wo26 En36 Fs38 and Wo18 En34 Fs48).
openaire   +2 more sources

Nanoscale solid-fluid interaction and amphibole formation in the lithospheric mantle

Scientific Reports
Nanoscale amphibole nucleation and growth in the Earth’s mantle is poorly understood despite its important role in the evolution and stability of the lithosphere, along with its influence on the coexisting fluid composition.
Thomas Pieter Lange, Mihály Pósfai, Márta Berkesi, Péter Pekker, Zsófia Pálos, Gábor Molnár, Csaba Szabó, István János Kovács   +7 more
doaj   +1 more source

Clinopyroxene application in petrogenesis identification of volcanic rocks associated with salt domes from Shurab (Southeast Qom)

Journal of Economic Geology, 2016
Introduction The study area is located in the Shurab area that is about 50 Km Southeast of Qom. Volcanic rocks of the Shurab area have basaltic composition that is associated with salt and marl units.
Somayeh Falahaty, Moussa Noghreyan, Mortaza Sharifi, Ghodrat Torabi, Homayon Safaei, Mohammad Ali Mackizadeh   +5 more
doaj  

Xenoliths in the alkali basalts of Makhtesh Ramon of Desert Negev (Israel) as indicators of mantle metasomatosis and magma generation

Литосфера, 2016
Xenoliths in the Early Cretaceous alkali basalts of Makhtesh Ramon basin (southern Israel) are represented by essentially olivine rocks: dunite (usually including clinopyroxen) - 5% of the total amount, lherzolite - 21%, wehrlite - 28%, clinopyroxenite -
G. B. Fershtater, Z. A. Yudalevich, V. V. Khiller   +2 more
doaj   +2 more sources

Metamorphic conditions of dolomitic marbles from the Qori metamorphic complex, southern Sanandaj-Sirjan zone, using phase thermodynamic diagrams [PDF]

علوم زمین خوارزمی
The Barrovian-Qori metamorphic complex, which is exposed in the southern part of the Sanandaj-Sirjan zone, has a succession of metaultramafic, metabasite, metapelite, metacalcic silicate, and marble lithological diversity.
Abdolnader Fazlnia, Mir Mohammad Miri
doaj