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The orthoamphibole-bearing rocks in the Sondeled- Tvedestrand area of the Fennoscandion Shild are * Present address : Uriran Private Co., P.O. Box 11/1664, Tehran, [ran characterised by a particularly high Mg content in relation to ferrous iron (Beeson, 1976). The coexisting minerals of this lithology (orthoamphibole, cordierite, ...
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Complete and ready to run including jaw crusher, belts, motor, full-enclosure guards, all integrated on a steel skid. Over-sized bearings and castings, robust construction, long-wearing cast manganese steel jaw …
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In contrast to orthoamphibole-cordierite gneiss in the other Cordilleran domes, the Tunk Creek unit occurs as a discontinuous km-scale layer rather than as smaller (m-scale) pods, is more calcic, and lacks garnet. In addition, kyanite did not transform to sillimanite, and spinel commonly occurs as a blocky matrix phase in addition to …
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Chapter 1, Phase relations of metamorphic amphiboles; natural occurrence and theory; Orthoamphibole and cummingtonite amphibolites; phase relations; medium-grade …
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Also, like the pyroxenes, amphiboles fall into two main series: the orthoamphibole series and the clinoamphibole series. Note that, in the box we have listed Mg 7 Si 8 O 22 (OH) …
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A recent thermodynamic model for the Na–Ca clinoamphiboles in the system Na 2 O–CaO–FeO–MgO–Al 2 O 3 –SiO 2 –H 2 O–O (NCFMASHO), is improved, and …
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Orthoamphibole varies in abundance (2–45 modal %) and typically occurs in randomly oriented sprays (0.25–1 cm long). Orthoamphibole has been partially to nearly completely replaced by biotite (Fig. 4a, b). Where this replacement is widespread, relict orthoamphibole occurs primarily as inclusions in garnet (Fig. 4b). Some …
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Analytical electron microscopy data suggests that calcium has a low solubility limit in the orthoamphibole structure. The hornblende lamellae range from only a few unit cells in thickness to about 80 nanometers. The formation of the calcic amphibole lamellae resulted from heterogeneous nucleation and growth along pre-existing (100) …
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Cordierite+orthoamphibole (Crd+Oam)-bearing gneisses in the Cormacks Lake complex are regionally associated with metapelites containing prismatic sillimanite and K-feldspar, metabasites that locally contain metamorphic orthopyroxene, and other high-grade rocks in the Central Gneiss (Dashwoods) subzone, in the southwestern Newfoundland …
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Orthoamphibole–bearing gneisses typically contain high MgO, Al 2 O 3 and low alkali contents, representing an enigmatic metamorphic lithology in orogens due to their …
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Phase equilibria (pseudosection) analysis for layers that lack reaction textures indicates metamorphic conditions of 720–750 °C at a range of pressures (>8 to <4 kbar) following …
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suggests that calcium has a low solubility limit in the orthoamphibole structure. The hornblende lamellae range from only a few unit cells in thickness to about 80 nanometers. The formation of the calcic amphibole lamellae resulted from heterogeneous nucleation. and growth along pre-existing (100) stacking faults.
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Orthoamphibole typically appears as elongate aggregates of radiating prisms. Mineral analyses reveal that the or- thoamphibole in granulite-facies rocks is ged- rite ( > 10 wt.% A1203, > l wt.% Na20), while limited data from amphibolite-facies samples indicate that it is anthophyllite containing < 6 wt.% A1203 in plagioclase-free gneisses, …
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Cordierite+orthoamphibole (Crd+Oam)-bearing gneisses in the Cormacks Lake complex are regionally associated with metapelites containing prismatic sillimanite and K-feldspar, metabasites that ...
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Cordierite–orthoamphibole gneisses and rocks of similar composition commonly contain low-variance mineral assemblages that can provide useful information about the metamorphic evolution of a terrane. New calculated petrogenetic grids and pseudosections are presented in the FeO–MgO–Al 2 O 3 –SiO 2 –H 2 O ...
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The widespread formation of orthoamphibole document subsequent near-isobaric cooling into the amphibolite facies. Based on the formation of metamorphic zircon in the cordierite-orthoamphibole gneiss we precisely determined an age of 2014 ± 8 Ma for granulite facies metamorphism in the Phikwe Complex. Rare detrital zircons comprise …
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In contrast to orthoamphibole-cordierite gneiss in the other Cordilleran domes, the Tunk Creek unit occurs as a discontinuous km-scale layer rather than as smaller (m-scale) pods, is more calcic, and lacks garnet. In addition, kyanite did not transform to sillimanite, and spinel commonly occurs as a blocky matrix phase in addition to vermicules ...
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Rare exposures of orthoamphibole mafic (Oam) gneiss of Mesoproterozoic age in the north-central Appalachians are confined to the northwestern New Jersey Highlands where they form thin lens-shaped bodies composed of gedrite and sparse anthophyllite, oligoclase (An 13 –An 20), biotite, magnetite, and local fluorapatite, rutile, …
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John C. Schumacher; Chapter 1, Phase relations of metamorphic amphiboles; natural occurrence and theory; Orthoamphibole and cummingtonite amphibolites; phase relations; medium-grade assemblages. Reviews in Mineralogy and Geochemistry 1982;; 9B (1): 171–173. doi: Download citation file: Ris (Zotero) Refmanager; EasyBib; Bookends;
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This paper describes the second known occurrence of whiteschist from Norway. Whiteschists and orthoamphibole-cordierite rocks, which can both be described in the M (F) ASH system, are found in the Modum Complex together with albitites in contact zones between metagabbros and supracrustals. They are formed due to extensive …
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Conventional estimates using the mineral compositions of the KTB samples yield a temperature around 630uC, at which the calculated stability field of calcic amphibole orthoamphibole chlorite ...
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Orthoamphiboles from the cordierite-amphibole-bearing rocks at Outokumpu span a large part of the gedrite-anthophyllite solid-solution series.
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Garnet–orthoamphibole rock (GOR) from southern Hengshan of the North China Craton (NCC) shows a prominent porphyroblastic texture involving garnet, orthoamphibole, …
DetailsOrthoamphibole- cordierite rocks are characterized by rosettes of am- phibole needles. Except for two localities where the rosettes of amphibole are coplanar, the growth of amphiboles is unoriented. A compositional layer- ing is present in a few instances. Two different varieties of orthoamphibole-cor- dierite rocks can be recognized in the ...
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Ionic substitution within the orthoamphibole series was dominated by the Mg-tschermakitic and edenitic exchange reactions. The amphibolites are thought to have been subjected to metamorphic temperatures above the orthoamphibole solvus during both the Proterozoic and the Cretaceous. Cretaceous metamorphism was followed closely by …
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Abstract Cordierite+orthoamphibole (Crd+Oam)-bearing gneisses in the Cormacks Lake complex are regionally associated with metapelites containing prismatic sillimanite and K-feldspar, metabasites that locally contain metamorphic orthopyroxene, and other high-grade rocks in the Central Gneiss (Dashwoods) subzone, in the southwestern …
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A recent thermodynamic model for the Na–Ca clinoamphiboles in the system Na 2 O–CaO–FeO–MgO–Al 2 O 3 –SiO 2 –H 2 O–O (NCFMASHO), is improved, and extended to include cummingtonite–grunerite and the orthoamphiboles, anthophyllite and gedrite. The clinoamphibole model in NCMASH is adopted, but the extension into the …
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Garnet–orthoamphibole rock (GOR) from southern Hengshan of the North China Craton (NCC) shows a prominent porphyroblastic texture involving garnet, orthoamphibole, kyanite, sillimanite, chlorite, rutile and quartz, with or without talc, hornblende and staurolite. Garnet develops coronae or symplectite assemblages of …
DetailsThe amphiboles grew at temperatures near to or just above that of the solvus crest with post-metamorphic cooling resulting in sub-solvus exsolution, the distribution of which is …
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ORTHOAMPHIBOLE AND CUMMINGTONITE AMPHIBOLITES 159 Introduction (SPEAR) 159 Origin of cordierite-anthophyllite rocks (SPEAR & SCHUMACHER) 160 Graphical analysis of low-Ca amphibolites (SPEAR) 163 Petrogenetic grids (SPEAR) 166 Phase relations 167 Law-grade assemblages and orthoamphibole-forming reactions 167 …
DetailsBy Peter W Uitterdijli Appel and Aage Jensen. Orthoomphiboles wiih pronounced iridescence are found in eight localities in the vicinity of Nuuk, the capital of Greenland. The iridescence, difficult to see on rough samples, becomes clearly visible when the material is cut. This iridescent orthoamphibole is mined by a company wholly owned by Nuuk ...
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PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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