anorthite. In the IUGS classification, anorthosite contains 0-5% Q, P/(A + P) >90, and M < 10 (M = Mafics). 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. The

open upright folds (F3) is restricted to the area adjacent to the anorthosite nappe and is interpreted as a set of visible in an outcrop or even in a thin section,.

(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. Photomicrograph of sample 09RDWES301 - an andesite collected during the Redoubt 2009 eruption. A rock thin section is created by gluing a small piece of rock onto a glass slide, then grinding it down to a thickness of 30 microns (the average human hair is about 100 microns in diameter) so that light shines through it when examined under the microscope. these clasts, an apparent ferroan troctolitic anorthosite, based upon our examination of thin section MAC88105,97 and our bulk chemical analysis of five separate fragments from MAC88 105,5 1 by INAA. This clast, designated W2 by the JSC curatorial facility, was originally about 1 cm Jan 19, 2017 - Photomicrograph of a thin section showing twinned, aligned plagioclase in anorthosite. A coarse grained igneous rock, anorthosite is characterized by being almost completely composed of plagioclase.

Anorthosite thin section

of feldspar (anorthosite), with the cleavage face of the crystals. av J Sundberg · 1988 · Citerat av 2 — My part of the work is described in the preface to report no. 2. This to be a thin skin with vanishing thermal capacity. Several authors Anorthosite. 1. 76 1.68.

Graded bedding and cumulate structures are also noticed. The rocks of the study area are classified based on petrography into anorthositic rocks, gabbroic This file is licensed under the Creative Commons Attribution 2.0 Generic license.: You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

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

Thin section (plane polarized light) of glassy phonolite (kenyte) lava with a large, sieve-textured anorthoclase crystal, Teleki Tarn, Mount Kenya. The glass is a quenched mixture of more than one melt, with different Fe contents and ferric/ferrous ratios resulting in contrasting colors.

anorthosites and associated rocks from eight Proterozoic massif anorthosite by crude phase layering in the marginal part within the rocks is also narrow.

Cleavages intersect Photomicrograph of plagioclase in anorthosite (BV106) in plane light. anorthosites and associated rocks from eight Proterozoic massif anorthosite by crude phase layering in the marginal part within the rocks is also narrow. 18 Jun 2017 23. Surface of moon, dark part is from rock called basalt and light coloured part s are the high land mostly called anorthosite. 24. Anorthosite rocks 30 Oct 2007 [1] Anorthosites, igneous rocks very rich in plagioclase, [2] Anorthosite, a plutonic igneous rock composed Thin section observations on.

To the left the Nodular Troctolite consists of olivine oikocrysts 20–30 cm long (pale) set in a matrix of anorthosite Many anorthosite outcrops are transected by thin veins and stringers of quartz and feldspar, manifesting incipient disaggregation by the granitic protolith to the host quartzofeldspathic gneiss. This advances to the situation where clusters of individual plagioclase megacrysts, some with adhering mafic intercumulus, are strewn throughout the enclosing quartzofeldspathic gneiss (e.g., Fig. 18.8A ). 2. ANORTHOSITE white course grained plagioclase MT. 3. APALITE fine pink CO. 4. BASALT olivine, La Bajada Hill NM Quarternary.
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Larger plutons, like the Mt. Lister Anorthosite, in northern orites mention clasts of anorthosite, but pyroxene- and olivine-bearing feldspathic lithologies such as impact-melt breccias, granulitic breccias, norites, and troctolites are mentioned just as frequently. Our own study of the 98 largest clasts in a thin section of Shişr 161 (25.2% Al. 2. O. 3) yielded only 4 of pure plagioclase [9]. Of 100 Andesite.

Quartz can be considered as a secondary mineral in anorthosite, since it represents less than 5% on the QAPF diagram. 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. The rock type is anorthosite, a cumulate rock made mostly of plagioclase.
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behaviour of plagioclase is assessed from analyses of three anorthosite units deformed polished thin sections using a JEOL Superprobe JXL. 8200 at the

This element presents a uniform distribution in the anorthosite, whereas in the 1.2.2 Previous work on the anorthosites of the Kunene Intrusive Complex. 29 Thin section microphotographs of the (a-c) white anorthosite suite and (d) dark Anorthosite: Anorthosite: A leucocratic coarse-grained plutonic rock consisting essentially of plagioclase (usually labradorite or bytownite) often with small amounts (110) is a very poor cleavage and is not usually seen in thin section. Cleavages intersect Photomicrograph of plagioclase in anorthosite (BV106) in plane light. anorthosites and associated rocks from eight Proterozoic massif anorthosite by crude phase layering in the marginal part within the rocks is also narrow. 18 Jun 2017 23. Surface of moon, dark part is from rock called basalt and light coloured part s are the high land mostly called anorthosite.