Anorthosite. Intrusive igneous, plutonic . Composed of calcic plagioclase with less than 10% ferro-magnesium minerals - plagioclase may be labradorite, bytownite, or anorthite. The name is from anorthose, an old name for triclinic feldspars. Anorthosite is often associated with gabbro

Anorthosite rock thin section

Rocks like this make up much of the Highlands of the Moon, where feldspar produces the light color. Shortly after material gathered together to form the Moon, the outer Moon melted. Inequigranular anorthosite. Ths rock has a continuum of grain sizes, from very small to quite large. It does not have a phenocrystic texture, having larger crystals set in a much finer-grained matrix.

Anorthosite thin section

(1984) studied 7 additional clasts, including magnesian anorthosite, troctolite and “dunite”. Dickinson et al. (1985) studied basalts from the processing fines. But Paul Warren made the most fuss, so we shall start with his observations: c1 (W-101) from ,46 and ,116 Detailed Description.

Find the perfect anorthosite stock photo. Huge collection, amazing choice, 100+ million high quality, affordable RF and RM images. No need to register, buy now!

Some smaller plutons, exemplified by many anorthosite bodies in the U.S. and Harris in Scotland, cover only a few dozen square kilometres. Larger plutons, like the Mt. Lister Anorthosite, in northern Labrador, Canada, cover several thousands of … 2020-12-23 [ LEFT ] NASA photo of an Apollo 16 rake sample, 65785, with a clast of pink spinel troctolite, labeled PST, set within recrystallized impact melt.

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Marvelous, I was there last week collecting a few pegmatite specimens and I am glad it is still there in one )large) piece! Anorthosite plutons occur in a wide range of sizes. Some smaller plutons, exemplified by many anorthosite bodies in the U.S. and Harris in Scotland, cover only a few dozen square kilometres. Larger plutons, like the Mt. Lister Anorthosite, in northern Labrador, Canada, cover several thousands of square kilometres. Se hela listan på geology.fandom.com 2013-04-23 · RM: Anorthosite is calcium feldspar, which is basically sand containing aluminum, calcium, low levels of soda and 1% iron. It could serve as an alternative material in many industrial applications. For example, it could replace kaolin, a major component of glass fiber manufacturing.

Se hela listan på en.wikipedia.org Most anorthosite layers are thin (less than 3 m) and only one analysis of plagioclase was obtained for the entire layer. However, to determine possible internal variation, two thick layers were studied in detail. In the 23 m thick layer –13, seven samples were analysed.
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BRECCIA sedimentary CA. 9. BRECCIA andesite grey CO. 10. BRECCIA chert in silica dolomite matrix .

Several authors Anorthosite. 1. 76 1.68. Within and adjacent to the intrusion, thin to moderately of the Beardmore-Geraldton belt covered the Hercules project area.
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av AG Milnes · 2002 · Citerat av 5 — the beginning of each Section and Subsection, describing the character of the documen- tation, outlining Rapakivi granite anorthosite magmatism ± a way of thinning and stabi A thin orogenic wedge upon thick foreland lithosphere and the.

Anorthosite. Cordierite.

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HIGGINS TEXTURAL COARSENING OF ANORTHOSITE Fig. 1. Schematic diagram of the relationships of the three principal lithologies of anorthosite and troctolite. The section is ~1 m thick, but the horizontal scale is not linear. To the left the Nodular Troctolite consists of olivine oikocrysts 20–30 cm long (pale) set in a matrix of anorthosite

• It contain plagioclase of An35-65 range. 14. ORIGIN of anorthosite Magmatic Origin: Massif anorthosite are magmatic and layered anorthosites are magmatic differentiation. • It has been derived from a basic magma either grabbroic or … Anorthosite is a rock type of the mafic-ultramafic succession, The thin section above doesn't allow evaluation of textures that may be related to overgrowths. Cite. 10th Dec, 2016.

Archean anorthosite complexes in the Superior Province are listed in Table 1. Thirty polished thin sections from all major lithological units were examined

Chondrite H5 Sahara 97095. Thin section. Chondrite H3, Brownfield 1937. Polished section. Chondrite L6. Sahara 98240.

BASALT scoriaceous NM recent flow.