amphibolite facies


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Related to amphibolite facies: Blueschist Facies, Granulite Facies, Metabasites

amphibolite facies

[am′fib·ə‚līt ′fā‚shēz]
(petrology)
Rocks produced by medium- to high-grade regional metamorphism.
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Then, a progressive metamorphism in these rocks is marked by the passing of greenschist facies mineralogy [actinolite + chlorite + quartz + plagioclase (albite) + epidote minerals [+ or -] muscovite [+ or -] calcite] to epidote-amphibolite facies mineralogy [hornblende + epidote minerals + quartz + albite [+ or -] garnet], and finally to amphibolite facies mineralogy [hornblende + garnet + plagioclase [+ or -] quartz].
Pressure-temperature path of Arquia Group rocks (NW Colombia): a petrographic analysis from mineral assemblages
The graphical analysis of greenschist to amphibolite facies mineral assemblages in metabasites.
Very low- and low-grade metamorphism of mafic volcanic rocks of the Mira terrane (Avalonia), southeastern Cape Breton Island, Nova Scotia
The rocks of the Tallinn zone vary from mafic amphibolite facies metavolcanites to metasediments represented by amphibole gneisses, biotite-plagioclase gneisses, quartz-feldspar gneisses, mica gneisses, and minor sulphide-graphite gneisses and magnetite quartzites (Jagala complex).
Outlines of the Precambrian basement of Estonia/Eesti eelkambriumi vanusega aluskorra pohijooni
The metamorphic rocks on the northwestern part of The sole rocks of JTGM consist of a basal part of the foliated peridotite and the sub-ophiolitic metamorphic rocks; garnet amphibolite facies grades downwards into amphibolite facies and greenschist facies with calcitemarble inter-layers which exhibits decreasing metamorphic grade and decreasing intensity of deformation downward from the stratigraphic base of the ultramafic rocks.
Facies and distribution of metamorphic rocks beneath the Muslim Bagh ophiolite (NW Pakistan): tectonic implications
It crosscuts the PPZ and extends into the NEGL, the amphibolite facies terrain.
Orogenic structures of the Precambrian basement of Estonia as revealed from the integrated modelling of the crust / Eesti aluskorra orogeenne struktuur kompleksse magnetvalja ja raskusjouvalja modelleerimise andmetel
However, in many places retrograde assemblages have formed in the conditions of the amphibolite facies.
Svecofennian metamorphic zones in the basement of Estonia/Eesti aluskorra Svekofennia moondevoondid
This lower amphibolite facies metamorphism overprints, in many samples, a pre-existing epidote-hornfels or greenschist assemblage containing epidote + variably sericitised plagioclase + actinolite [+ or -] biotite.
Mafic intrusions on Campobello Island: implications for New Brunswick--Maine correlations
The Leo Pargil shear zone is a zone of distributed ( greater than 500 m) deformation that consistently records top-down-to-the-west -northwest sense of shear and juxtaposes amphibolite facies rocks in the footwall with low-grade metasedimentary rocks in the hanging wall.
Strain partitioning during dome formation in the Himalaya: Insights into the Ama Drime Massif and Leo Pargil dome, NW India
The formation is metamorphosed to lower amphibolite facies and is deformed.
Minimum age of the Neoproterozoic Seven Hundred Acre Island Formation and the tectonic setting of the Islesboro Formation, Islesboro block, Maine
The study sector of the MCT zone recorded a metamorphic event at higher PT conditions up to amphibolite facies followed by a lower grade metamorphism and deformation acquired during exhumation reaching the PT conditions of 2-4 Kbar and 300-400degC at nearly 14-17 Ma determined through Ar/Ar datings on white micas and biotites recrystallized along the mylonitic foliation pointed out a cooling age for the MCTZ (Montomoli et al.
The Main Central Thrust Zone in Western Nepal
Garnet porphyroblasts from upper amphibolite facies show a textural unconformity defined by inclusion-free rims, which coincides with changes in the garnet composition for both major a nd trace elements, including Cr.
Trace element zoning in calcic, pelitic garnet: garnet growth histories and Cr immobility. (Geological Association of Canada 2000 Annual Technical Meeting Newfoundland Section)
This low-temperature shearing event is associated with chloritization, hematization, and illitization/seritization of the amphibolite facies gneisses, and disseminated silver and pyrite mineralization.
Leader Mining International Inc. - Major Silver Discovery At Knife Lake-Saskatchewan, Canada

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