Results 161 to 170 of about 1,741 (196)

Phase equilibria and mixed parageneses of metabasites in lowgrade metamorphism

Mineralogical Magazine, 1985
AbstractThe system Na2O-CaO-MgO Al2O3-SiO2-H2O is proposed to model phase equilibria and mineral parageneses for low-temperature metamorphism of basaltic rocks. Univariant reactions marking the transitions between various sub-greenschist facies are identified and some have been experimentally determined.
J. G. Liou, S. Maruyama, M. Cho
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Chemographic analysis of metabasite assemblages from c central Scottish Highlands

Lithos, 1981
Abstract From the observed textures and mineral associations, chemographic relations have been derived in isobaric T-X CO 2 space for the minerals actinolite, ankerite, calcite, chlorine, epidote, and hornblende in Scottish Dalradian metabasites from Central Perthshire.
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Metabasites with eclogite facies relics from Variscides in Sardinia, Italy: a review

International Journal of Earth Sciences, 2006
Metabasites with eclogite facies relics occur in northern Sardinia as massive to strongly foliated lenses or boudins embedded within low- to medium-grade rocks (Anglona) and migmatites (NE Sardinia). U–Pb zircon dating yielded 453 ± 14, 457 ± 2  and 460 ± 5 Ma as the protolith ages; 400 ± 10 and 403 ± 4 Ma have been interpreted as the ages of the HP ...
FRANCESCHELLI, MARCELLO, PUXEDDU M, CRUCIANI, GABRIELE, UTZERI D.   +3 more
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Metabasite parageneses in south-west England.

1994
Metabasites with diagnostic chlorite ± pumpellyite ± actinolite assemblages are sporadically developed in the Variscan belt of south- England. Consideration of these phases in the NCFMASH system [SiO2-(Al2O3+Fe2O3)-FeO-MgO-CaO-Na2O-H2O], using the epidote projection, shows in most cases sub-parallel tielines between coexisting chlorite - pumpellyite ...
ROBINSON D., MAZZOLI, CLAUDIO, PRIMMER T. J.   +2 more
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Upper amphibolite- and granulite-facies metabasites: the natural record

Upper amphibolite- and granulite-facies metabasites, ubiquitous in Archaean and Proterozoic terranes, represent a critical source of information on the lower continental crust. Elucidating the metamorphism of these rocks provides insights into the processes occurring at depth throughout Earth’s history.
Jacob Forshaw, Eleanor Green, Pierre Lanari   +2 more
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Magmatic Chromian Spinel in Metabasite From the Latimojong Mountains, Sulawesi, Indonesia

2022
In metavolcanic rocks of the Latimojong Mountains, central Sulawesi, Indonesia, chromian spinel spans a wide compositional range in Cr/(Cr+Al). Spinel occurs in the matrix of metamorphic silicates (Chl+Act+Pmp) and as inclusions in magmatic clinopyroxene phenocrysts (Fig. 1).
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A Comparison of amphiboles from medium- and low-pressure metabasites

Contributions to Mineralogy and Petrology, 1982
A comparison of published metabasite amphibole analyses from medium and low-pressure metamorphic terrains reveals that there is no systematic variation in Na, NaM4, Al or AlVI as a function of pressure. This may be due to blurring of the differences by variation in oxidation state, or by analytical differences between laboratories.
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metabasite, n.

2023
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Metabasite Basement of the Voikar Island Arc in the Polar Urals

2006
Polarforschung
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The oldest metabasites of the north Yenisei Ridge

Doklady Earth Sciences, 2015
I. I. Likhanov, V. V. Reverdatto
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