Amphibolite


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Related to Amphibolite: Amphibolite Facies

amphibolite

[am′fib·ə‚līt]
(petrology)
A crystalloblastic metamorphic rock composed mainly of amphibole and plagioclase; quartz may be present in small quantities.

Amphibolite

 

a schistose metamorphic rock composed chiefly of alumina-bearing amphibole (hornblende) and plagiociase; sometimes contains granite. Amphibolite is formed from various matrices subjected to profound metamorphism sometimes accompanied by metasomatism and the introduction of silica, magnesium, and iron. Some black varieties of amphibolite are used as industrial gems and ashlars.

References in periodicals archive ?
At the Western Queen, the geology is steep west dipping and comprises of intercalated sheared amphibolites of mafic to ultramafic composition with thin iron formation horizons, komatiitic basalt, dolerite sills, and talc chlorite schists.
The samples selected were gneisses, schists and amphibolites. Figure 3 shows the thin sections of rocks from the SG-3 Archaean section.
A slight enrichment of HREEs with respect to LREEs is observed, with a very noticeable Pr enrichment in sample ARQ-181 (garnet amphibolite).
(1990) the high-grade metamorphic rocks in both the Chuggin Road and Lime Hill units include biotite, bioitite-cordierite, and sillimanite-bearing paragneiss, migmatitic paragneiss, marble, quartzite, amphibolite, and tonalitic orthogneiss.
Wang, "Experimental study on dynamic mechanical properties of amphibolites under impact compressive loading," Chinese Journal of Rock Mechanics and Engineering, vol.
Their protolith corresponds to medium-grained pelitic sediments, which were affected by a metamorphism reaching the amphibolite facies.
South Purulia Shear Zone (SPSZ) (Figure 1, after [10]) consists of mainly granite gneiss, amphibolites, phyllites, schist, carbonatite, and quartz-magnetite-apatite rocks and is of early mesoproterozoic age.
The sources of albite are dominantly from the weathering of amphibolite, tonalite, diorite, and granodiorite that intruded Maru schist belt.
Chang, "True triaxial strength of the KTB amphibolite under borehole wall conditions and its use to estimate the maximum horizontal in situ stress," Journal of Geophysical Research, vol.
The dominant lithology encountered during the drilling was a coarse-grained metamorphic amphibolite facies ultramafic unit.
According to these authors above, igneous rocks of this area occur as small, circular to oval outcrops and include members of the Older granite suite mainly granites, granodiorites and syenites while associated schists in the area are: quartz-biotite schist, amphibolite schist, muscovite schist and quartzitic schist.