Request PDF | Neutron diffraction pole figures of geological anorthosite textures | Texture investigations on geological anorthosite specimens with the triclinic plagioclase-type structure have

osti.gov journal article: lunar anorthosite 15415: texture, mineralogy, and metamorphic history.

The exploitation of anorthosite for industrial The rock type is anorthosite, a cumulate rock made mostly of plagioclase. Cumulate rocks typically have the same minerals about the same size. In this case, grain textures look somewhat annealed, possibly because of deformation and annealing when it was still very hot. Stillwater Complex, Montana. Plane/cross-polarized light, field width is 6 mm. STW-37 Anorthite is a rare member of the Feldspar group.Italian Localities include Monte Somma, Mount Vesuvius; Val Schiesone, Sondrio; and Val Di Fassa, Trento. Japan produces excellent crystals thinly coated with a dark layer of lava at Miyaki Jima (Miyaki Island), Tokyo Prefecture.

Anorthosite texture

Lunar anorthosite 15415 consists almost entirely of anorthite (homogeneous anorthite 96.6 molecule percent), with accessory diopsidic augite and traces of hypersthene, ilmenite, and a silica mineral. The rock has had a complex metamorphic history. The texture reflects at least two episodes of shearing (followed by intense and partial recrystallization, respectively), one episode of cataclastic 2017-06-18 Figure 20-1a. a. Typical texture of Archean anorthosite. From theFiskenæsset complex, W. Greenland. Myers (1985) Stratigraphy and structure of the Fiskenæsset complex, West Greenland.Grønl.

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

The chemical composition deviates somewhat from the average ana-lyses of anorthosite. Jul 6, 2019 - This Pin was discovered by Bernatz.

The Bethampudi layered anorthosite complex at the border zone of Archaean internal structure and texture, nature and composition of plagioclase feldspar [1]

(Jan 1971); Weigand, P. W. (1975) Pyroxenes in the Patwar mesosiderite: Meteoritics 10(4): 341-351. 2010-01-01 · 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. Quantitative texture analysis of an anorthite (polycrystalline plagioclase feldspar) has been under takenusinganoptical microscopeequippedwithauniversal stage. Themicrostructurewasstudiedon three orthogonal sections.

I14-05 – Andesite porphyry – you guessed it, porphyrictic texture. Identify the phenocrysts. 1709 (IU-40) – Identify the phenocryst and describe the texture.
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The name is from anorthose, an old name for triclinic feldspars. Anorthosite is often associated with gabbro. Gabbros and norites are found in sills, dikes, stocks, lopoliths, and other bodies.

2597.35 Mottled anorthosite, variable textures such as the size of mottles, orthopyroxene-clinopyroxene.
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DESCRIPTIONS OF ANORTHOSITES The anorthositic rocks (Fig. la) differ from the dark, Ti-rich lunar basalts in composition, density, and texture. They are

la) differ from the dark, Ti-rich lunar basalts in composition, density, and texture. They are In the other trend, the rocks are norites, troctolites, dunite, spinel anorthosites, The 62237 troctolitic anorthosite clast has a clear igneous texture; if this rock can Dec 1, 2010 individual anorthosite plutons and between anorthosites and adjacent rocks is due to overprinting of primary igneous textures and boundary In low-strain areas, igneous textures, involving plagioclase, olivine and/or pyroxene (ortho- or clinopyroxene) may be preserved and igneous crystals up to. 30 cm The Laramie anorthosite complex includes three anorthositic plutons: the Poe Mountain, Chugwater, in zones of intense alteration, a texture suggesting that.

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The textures of plagioclase crystals within large olivine oikocrysts KEY WORDS: Ostwald ripening; CSD; plagioclase; texture preserve the sequence of the formation of anorthosite. Such textures have been quantiﬁed in a troctolite–anorthosite from the Proterozoic Lac-St-Jeananorthosite complex,Canada. Crystalsize distributions

1.2 Color.