Results 141 to 150 of about 3,223 (190)

Major-Element Geochemistry and Fe3+/ΣFe of Metabasites

Journal of Petrology
Abstract Metabasites (metamorphosed mafic rocks) are crucial for understanding metamorphic and tectonic processes. Their preservation in exhumed orogenic belts from throughout Earth’s history and the diverse mineral assemblages they form under different pressure–temperature conditions make them valuable for studying metamorphic processes.
Hugo Dominguez, Thorsten Andreas Markmann, Renée Tamblyn   +2 more
exaly   +3 more sources

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The Austridic eclogites, metabasites and metaultrabasites from the Pohorje area (Eastern Alps, Yugoslavia): 2. The metabasites and metaultrabasites, and concluding considerations

Rendiconti Lincei, 1991
Petrography, mineral chemistry, metamorphic evolution and geothermo-barometric estimations concerning the Pohorje metabasites and metaultrabasites are presented and discussed. Consistently with the evolution detected in the associated eclogites, and disregarding serpentinization, these rocks record a three-stage metamorphic evolution: (i) an older, dry,
Dario Visona'
exaly   +3 more sources

Intrusive metabasite belts within the Moine assemblage, west of Loch Ness, Scotland: evidence for metabasite modification by country rock interactions

Journal of the Geological Society, 1985
Metabasites representing an extensive differentiated sill-complex (with minor dykes) now form two c . 10 km-wide NE-SW ‘belts’ in western Inverness-shire: a Western Belt, overlapping the ‘Quoich Line’, and an Eastern Belt, beside the Great Glen Fault. Regional evidence
N. M. S. Rock, R. Macdonald, B. H. Walker, F. May, J. D. Peacock, P. Scott   +5 more
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A new petrogenetic grid for low-grade metabasites

Journal of Metamorphic Geology, 1991
Abstract We have used internally‐consistent thermodynamic data to present calculated phase equilibria for the system Na2O‐CaO‐MgO‐Al2O3‐SiO2‐H2O (NCMASH), in the range 0–500° C and 0.1–10 kbar, involving the phases anorthite, glaucophane, grossular, heulandite, jadeite, laumontite, lawsonite, paragonite, prehnite, pumpellyite, stilbite, tremolite,
M. FREY, C. DE CAPITANI, J. G. LIOU
exaly   +2 more sources

Metabasite amphiboles of the Scottish Dalradian

Contributions to Mineralogy and Petrology, 1974
Blue-green hornblendes are observed in metabasite assemblages throughout the chlorite, biotite and garnet zones of the southwest Scottish Highlands. Actinolites are common in more Mg-rich metabasites in these zones.
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Iron isotope fractionation in subduction-related high-pressure metabasites (Ile de Groix, France) [PDF]

Contributions To Mineralogy and Petrology, 2017
Characterisation of mass transfer during subduction is fundamental to understand the origin of compositional heterogeneities in the upper mantle. Fe isotopes were measured in high-pressure/low-temperature metabasites (blueschists, eclogites and retrograde greenschists) from the Ile de Groix (France), a Variscan high-pressure terrane, to determine if ...
Afifé El Korh, Béatrice Luais
exaly   +3 more sources

Occurring asbestos in agricultural soils serpentinite-metabasite derivate (Calabria, southern Italy)

Rendiconti Online della Società Geologica Italiana, 2016
Since soils that developed on serpentinite-metabasite bedrocks could be rich in asbestos minerals which are known to have a negative impact on agricultural activity and on environmental quality, six agricultural soil samples close to the urban centers of Conflenti and Decollatura (Sila Piccola, Calabria) have been collected and characterized by using ...
Bloise A, Catalano M, PUNTURO, Rosalda
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Premetamorphic lateritisation in Proterozoic metabasites of Rogaland, SW Norway

Contributions to Mineralogy and Petrology, 1989
Heterogeneous layers of granulite facies metamorphic basites of the Proterozoic supracrustal Faurefjell Formation in Rogaland, S.W. Norway, display an extreme chemical variation. Within a single layer the bulk chemical composition gradually changes from approximately basaltic in basic granulites to alumina-iron-rich in granofelses. Component-ratios and
Maijer, C., Jansen, J. B. H., Bol, L. C. G. M.   +2 more
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Metabasites along the Lunvozh river (Middle Timan): petrography, mineralogy, petrochemistry

Vestnik of geosciences, 2023
A small dike of unknown age was found on the territory of the Kanin-Timan region within the Middle Timan along the Lunvozh river. Our studies revealed that the rocks, composing this intrusive body, corresponded to basaltic andesites according to the content of the main rock-forming elements.
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On a peculiar metabasite in hercynian phyllites (sicily)

TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, 1976
On the basis of a mineralogical, petrological and chemical study of a “greenstone” complex intercalated in a phyllitic formation in the Western Peloritani Mountains, two main rock types can be distinguished: amphibole-chlorite metabasite (with traces of an old generation of glaucophane), and albite metabasite.
openaire   +1 more source