2014-5-15 is a gneiss-dome terrane containing mica schists with kyanite or silli manite. Seven wet-chemical analyses of biotites from the Orange area in the critical assemblage quartz-muscovite-biotite-garnet-staurolite kyanite or sillimanite indicate that the main areal variation is in the Fe/Mg ratio.
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The garnet with sillimanite inclusions records an increase in pressure at low‐P (~5.2–7.2 kbar) and moderate temperature conditions (~620–660 °C) at c. 360 Ma. The garnet with kyanite inclusions in the other rock types was also formed during an increase in pressure but at higher pressure conditions (~7.0–8.9 kbar at ~600–640 °C).
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2011-8-10 GASP geobarometer, which is applicable for garnet + sillimanite/kyanite + plagioclase + quartz assemblage, has been widely applied to pelitic and psammitic metamorphic rocks. Newton and Haselton (1981) formulated the geobarometer based on the experiments of Goldsmith (1980) and the activity model of garnet ( Newton et al., 1977 ) and ...
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2019-4-9 gneisses, Kyanite-staurolite-garnet-mica gneisses and sillimanite-garnet-mica (±staurolite) gneisses. The garnet-sillimanite bearing gneisses occupy higher elevations of the area and their occurrence is not persistent throughout. It is hard, compact and shows alternating bands of quartzo-feldspathic and micaceous material. It is composed of ...
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2000-4-28 Staurolite-Kyanite Schist Sillimanite-Garnet Schist Graphite Schist Calcite Schist (Schistose marble) Schistose Quartzite: Greenschist Chlorite Schist Chloritoid Schist Amphibolite (Hornblende Schist) Actinolite Schist Graphite Schist Pyroxene Schist Epidote-Chlorite Schist
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2011-3-22 Staurolite + Quartz + Muscovite Garnet + Biotite + Kyanite + H 2 O. ... D.M. Carmichael examined thin sections of one particular metapelite that contains both kyanite and sillimanite. The rock shows no evidence that the sillimanite was forming
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2017-4-4 • Kyanite zone. Schists with kyanite, biotite, muscovite, quartz, plagioclase, and usually garnet and staurolite • Sillimanite zone. Schists and gneisses with sillimanite, biotite, muscovite, uartz, plagioclase, garnet, and perhaps staurolite. Some kyanite may also be present (although kyanite and sillimanite are both polymorphs of Al 2 SiO ...
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The peak assemblage of the garnet–kyanite granulite includes garnet (core part)+kyanite+ternary feldspar+quartz+rutile. Sillimanite+garnet (rim part)+K-feldspar+ oligoclase+ilmenite+biotite and spinel+albite+biotite or spinel+cordierite±orthopyroxene, which are coronas around sillimanite and garnet, are retrograde products of this peak ...
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2021-11-19 Garnet sillimanite gneiss - Isle of Harris This coarse-grained, Lewisian metamorphosed granite comes from Rodel on South Harris in the Western Isles of Scotland. The rock probably originated as a siltstone sediment in the Archean, but
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2014-5-15 is a gneiss-dome terrane containing mica schists with kyanite or silli manite. Seven wet-chemical analyses of biotites from the Orange area in the critical assemblage quartz-muscovite-biotite-garnet-staurolite kyanite or sillimanite indicate that the main areal variation is in the Fe/Mg ratio.
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2019-4-9 gneisses, Kyanite-staurolite-garnet-mica gneisses and sillimanite-garnet-mica (±staurolite) gneisses. The garnet-sillimanite bearing gneisses occupy higher elevations of the area and their occurrence is not persistent throughout. It is hard, compact and shows alternating bands of quartzo-feldspathic and micaceous material. It is composed of ...
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2011-3-22 Staurolite + Quartz + Muscovite Garnet + Biotite + Kyanite + H 2 O. ... D.M. Carmichael examined thin sections of one particular metapelite that contains both kyanite and sillimanite. The rock shows no evidence that the sillimanite was forming directly from kyanite. Instead, examination of the rock in thin section shows that the kyanite has ...
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2015-8-11 The garnet-sillimanite bearing gneisses occupy higher elevations of the area and their occurrence is not persistent throughout. It is hard, compact and shows alternating bands of quartzo-feldspathic and micaceous material. It is composed of quartz,
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2017-4-4 • Kyanite zone. Schists with kyanite, biotite, muscovite, quartz, plagioclase, and usually garnet and staurolite • Sillimanite zone. Schists and gneisses with sillimanite, biotite, muscovite, uartz, plagioclase, garnet, and perhaps staurolite. Some kyanite may also be present (although kyanite and sillimanite are both polymorphs of Al 2 SiO ...
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2021-11-19 Garnet sillimanite gneiss - Isle of Harris This coarse-grained, Lewisian metamorphosed granite comes from Rodel on South Harris in the Western Isles of Scotland. The rock probably originated as a siltstone sediment in the Archean, but was metamorphosed when it was subjected to temperatures in excess of 800°C during the Laxfordian orogeny in ...
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1998-5-4 Garnet aluminosilicates kyanite andalusite sillimanite chloritoid staurolite topaz zircon titanite olivine - very important example covered in more detail next lecture humite group structures determined by size(s) and charge(s) of cations in the structure often rather dense minerals -
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Although most andalusite and sillimanite‐bearing veins occur in host rocks that also contain Al 2 SiO 5, kyanite‐quartz veins crosscut rocks that lack Al 2 SiO 5 (e.g. staurolite schist, granite). A quartz vein containing andalusite + kyanite + sillimanite + staurolite + muscovite occurs in
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2016-2-2 17 Sillimanite Sillimanite (fibrolite), intergrown with biotite in schist. Plane-polarised light, field of view 5 mm ... 94 Muscovite Muscovite (colourless), with biotite, garnet and kyanite in schist. Plane-polarised light, field of view 6 mm. 95 Muscovite
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2020-12-3 Kyanite inclusions (three tabular grains showing good cleavage and brown-pink interference colors) in andalusite (dark gray interference color, poorly developed cleavage) in a kyanite-andalusite-sillimanite (+ staurolite) quartz vein. This rock was "caught in the act" as kyanite reacted to form andalusite. The photo is
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2003-11-4 Sillimanite-kyanite-garnet mica schist, Damara belt Specimen K518B . This schist comes from the Trough zone of the Damara belt, Namibia, in an area studied by Karl Kasch (who kindly provided this specimen). The Trough zone consists of a thick
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2019-4-9 gneisses, Kyanite-staurolite-garnet-mica gneisses and sillimanite-garnet-mica (±staurolite) gneisses. The garnet-sillimanite bearing gneisses occupy higher elevations of the area and their occurrence is not persistent throughout. It is hard, compact and shows alternating bands of quartzo-feldspathic and micaceous material. It is composed of ...
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2011-3-22 Staurolite + Quartz + Muscovite Garnet + Biotite + Kyanite + H 2 O. ... D.M. Carmichael examined thin sections of one particular metapelite that contains both kyanite and sillimanite. The rock shows no evidence that the sillimanite was forming directly from kyanite. Instead, examination of the rock in thin section shows that the kyanite has ...
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2017-4-4 • Kyanite zone. Schists with kyanite, biotite, muscovite, quartz, plagioclase, and usually garnet and staurolite • Sillimanite zone. Schists and gneisses with sillimanite, biotite, muscovite, uartz, plagioclase, garnet, and perhaps staurolite. Some kyanite may also be present (although kyanite and sillimanite are both polymorphs of Al 2 SiO ...
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Of these samples, eight contain andalusite, 26 contain sillimanite, 56 contain kyanite, four contain andalusite + sillimanite, and nine contain sillimanite + kyanite. Ferric iron in garnet is assumed to be 3% of the total iron. For biotite, 116% ferric iron is assumed for the graphite–ilmenite-bearing samples, and 20% for the magnetite ...
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1998-5-4 Garnet aluminosilicates kyanite andalusite sillimanite chloritoid staurolite topaz zircon titanite olivine - very important example covered in more detail next lecture humite group structures determined by size(s) and charge(s) of cations in the structure often rather dense minerals -
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Description. IMAR 7 th Edition. Kyanite, andalusite, and sillimanite are naturally occurring anhydrous aluminum silicate minerals. Each has the same chemical formula, Al 2 SiO 5, but differing crystal structures, making them mineral polymorphs.These variances in
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2016-2-2 17 Sillimanite Sillimanite (fibrolite), intergrown with biotite in schist. Plane-polarised light, field of view 5 mm ... 94 Muscovite Muscovite (colourless), with biotite, garnet and kyanite in schist. Plane-polarised light, field of view 6 mm. 95 Muscovite
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2011-11-22 Kyanite 蓝晶石 Sillimanite 硅线石 Fire Agate 火玛瑙 Coral 珊瑚 Lapis Lazuli 青金石 Smithsonite 菱锌矿 Alexandrite 亚历山大变色石 ... Garnet 石榴石 Fire Opal 火蛋白石 Tourmaline 碧玺、电气石 Barite 重晶石 Green Quartz 绿水晶 Orthoclase 正长石 ...
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