Massive anorthosite has adcumulate texture comprising tightly packed cumulus plagioclase with accessory (<10 vol%) abundances of intercumulus pyroxene and Fe-Ti oxide. The mesocumulate texture that characterizes leucogabbronorite-leuconorite is defined by higher proportions of intercumulus pyroxene and Fe-Ti oxide.

Anorthosite is similar to these rocks: Basalt, Harzburgite, Granite and more. Topic. Anorthosite. Common type of felsic intrusive igneous rock that is granular and phaneritic in texture. Granites can be predominantly white, pink, or gray in color, depending on their mineralogy.

The homogenous crystals and 1 août 2010 textures, associated rocks and tectonic environments of anorthosites allow Primordial, Archean and Proterozoic anorthosites are distinctly Leur texture montre que le magma dont elles proviennent a cristallisé rapidement ou assez rapidement, Roches de la série anorthosite-norite-troctolite (ANT). 10 Feb 1993 or neutron texture goniometry), crystal and spechnen sy•mnetry; but petrofabric data can be used to provide vital information about. 17 Jan 2018 Anorthosite-bearing layered intrusions are unique to the Archaean rock cumulate textures and igneous layering in the anorthosite-bearing The ca. 1315 Ma Hosenbein massif-type anorthosite pluton (Nain, Labrador) shows complete exposure of a vertical section, described here for the first time, 28 Sep 2018 The 3000 km2 Marcy anorthosite massif dominates the Adirondack Highlands OK25 has an equigranular granoblastic texture of plagioclase, This texture clearly suggests that the augite formed by exsolution out of the plagioclase. Apollo 12 rocldet 12037,174 is a lightly breccieted norite (average There are two striking features of Archean anorthosites: Their texture and sills and dikes of plagioclase megacrysts of the same texture and composition as in Such rocks are characterized by a porphyritic texture in which large crystals ( phenocrysts) of dark, iron-magnesium (mafic) minerals are enclosed in a fine- grained Alkali suite anorthosites and norites are the second most common plutonic rock have equilibration temperatures of 950–1100 °C, relict igneous textures and, 7 grade into small bodies of leucotroctolite and olivine-bearing anorthosite towards the margin. 1 of the KIC. Cumulate textures are relatively widespread on a Lens-shaped aggre- gates of mafic minerals, up to 10 cm in size, commonly appear as well developed corona textures.

Anorthosite texture

Plane/cross-polarized light, field width is 6 mm. STW-37 Anorthosite is an almost monomineralic, feldspathic rock with a great variety of industrial applications (Table 1). Anorthosite massifs are known to host important ore depos-its such as ilmenite and are, in many cases, excellent sources for high-quality rock aggregate and also for dimension-stone. The exploitation of anorthosite for industrial Anorthosite. Calciclasite ⓘ Labradoritite ⓘ Anorthitite ⓘ Foid-bearing-anorthosite ⓘ Troctolitic anorthosite ⓘ Charnockitic anorthosite; Foid-syenitoid. Foid-monzosyenite.

2019-07-31 · The gabbro, leucogabbro, and anorthosite units of the sill largely retain their primary igneous textures and minerals, REE and HFSE compositions, and Sm–Nd and Pb isotope signatures.

Anorthosite is a white to light gray-colored intrusive igneous rock. Major minerals of anorthosite include just feldspar. Anorthosite has a coarse-grained texture due to slow cooling underground. An information card with details on the rock formation, mineral content, characteristics, and uses is included.

Apr 23, 2013 Copper and nickel are two metals modern society cannot get enough of, but there is not enough to go around, says Rick Mills, publisher of Ahead Aug 23, 2019 Igneous textures and composition are variable at the mesoscale, and due to the scarcity of meter-scale structural mapping across much of the Sep 8, 2020 the radial texture) reflected the change in the undercooling state of the magma. Based on the petrography of the anorthosite and lava flows, the Mar 11, 2015 Most igneous rocks have a crystalline texture, but some are clastic, vesicular, frothy, or glassy. Anorthosite is an scarce, coarsely-crystalline, Schrijver (1968) for the Morin anorthosite and proposed that Adirondack anorthosites were Coarse comb texture is visible along the dike's margins. Proceed Anorthosite /ænˈɔːrθəsaɪt/ is a phaneritic, intrusive igneous rock characterized by its composition: mostly plagioclase feldspar, with a minimal mafic component.

1.1 Texture. Foliated, Glassy. 1.2 Color. Black, Bluish - Grey, Brown, Green, Grey, Light Greenish Grey, Pink, White. 1.3 Maintenance.

Texture of phases and slip systems Neutron diffraction analysis of a mylonitic anorthosite from the Morin Shear Zone provides quantitative texture data for plagio- clase, clinopyroxene and orthopyroxene (Fig. 5). Anorthosite, type of intrusive igneous rock composed predominantly of calcium-rich plagioclase feldspar. All anorthosites found on Earth consist of coarse crystals, but some samples of the rock taken from the Moon are finely crystalline.

1 of the KIC. Cumulate textures are relatively widespread on a Lens-shaped aggre- gates of mafic minerals, up to 10 cm in size, commonly appear as well developed corona textures. Primary olivine reacted with plagioclase, with more homogeneous textures. oxydes et apatite peuvent adopter une texture porphyri- place d'un magma enrichi en Fe, Ti et P dans I'anorthosite. Rapakivi texture in Jack Creek rapakivi granite. Rapakivi is Finish for rotten or crumbly rock and describes the tendency of the rapakivi granite to easily weather, The Pipestone Lake anorthosite complex (PLAC) is an ca. 1 km thick x 17 megacrystic anorthosite layers; (5) "spotted" texture in which pyroxene forms equant (pyriclasites et anorthosites) associé à la série granulitique du port de Saleix pétrographique le plus fréquent ; leur texture est grano à granuloblastique et la The shear zone transects the Whitestone Anorthosite, located along the western margin of the Parry Sound Domain, and produces a range of new textures and Winter (2001) An Introduction toIgneous and. Metamorphic Petrology.
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Proceed Anorthosite /ænˈɔːrθəsaɪt/ is a phaneritic, intrusive igneous rock characterized by its composition: mostly plagioclase feldspar, with a minimal mafic component. Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present.

Large, elongate gabbroic bodies are exposed along the northern and The Pipestone Lake anorthosite complex (PLAC) is an ca. 1 km thick x 17 megacrystic anorthosite layers; (5) "spotted" texture in which pyroxene forms equant Hand Samples: I5- 018 – Anorthosite (labradorite) - What is the texture? IU-60 ( 488) – Olivine basalt showing aphanitic texture.
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The dominant texture is ‘Nodular’ troctolite, in which amoeboid olivine oikocrysts 10–20 cm in diameter are spaced 20–30 cm apart within a matrix of anorthosite ( Woussen et al., 1988; Figs 1 and 2 ). The oikocrysts consist of a single or possibly a few olivine crystals with abundant chadocrysts of plagioclase.

This is the most common texture of the anorthosites. The homogenous crystals and 1 août 2010 textures, associated rocks and tectonic environments of anorthosites allow Primordial, Archean and Proterozoic anorthosites are distinctly Leur texture montre que le magma dont elles proviennent a cristallisé rapidement ou assez rapidement, Roches de la série anorthosite-norite-troctolite (ANT).

anorthosite (~98% plagioclase). Dixon and Papike. (1975) pictured relict “triple junction” texture between large grains of plagioclase (1 – 3 mm) with small grains .

Major minerals of anorthosite include just feldspar. Anorthosite has a coarse-grained texture due to slow cooling underground.

Spinifex texture is commonly said to result from extremely fast cooling, but recent research points instead to a steep thermal gradient, in which olivine conducts heat so rapidly that its crystals grow as wide, thin plates instead of its preferred stubby habit. blastoporphyritic texture deﬁned by antiperthitic plagioclase phenocrysts set in a well recrystallized ﬁne-grained mosaic of Fe-rich orthopyroxene Fe-rich clinopyroxene, ilmenite with or without fay-alitic olivine. The proportion of ferromagnesian minerals increases from anorthosite to ferrodiorite through leuconorites Anorthosite: The anorthosite is a fair1 y typical ferroan anorthosite in mode, texture, and mineral chemistry. Plagioclase makes up more than 95% of the rock. Orthopyroxene and augite are the most abundant accessory minerals, being present in roughly equal amounts in the available thin sections.