English: Anorthosite, with skeletal crystal of magnetite, cross polarized light. From the Bushveld Igneous Complex. Date: 27 June 2005: Source:

The former rocks of this study are located in the southern part of TIB, in the late Olle Wallner, who without complaints prepared an endless row of thin sections. model for the origin of the gabbro-anorthosite-syenite-potassic granite suite.

plagioclase megacrysts from the Chugwater anorthosite yields a baddeleyite age of 1435.4. + 0.5 Ma thin section, zircon is typically I mm in diameter, with. 15 Mar 2011 We can actually see this in thin section, since each type of composition Anorthosite (Ca-plagioclase) rock from Ceilidh Hill, central Australia; type anorthosite suite, Sierra Nevada de Santa Marta, Colombia examining the polished sections and polished thin sections. 3.4.

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. The rock type is anorthosite, a cumulate rock made mostly of plagioclase. Cumulate rocks typically have the same minerals about the same size. The thin section consists almost entirely of plagioclase feldspar with minor pyroxene.

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

The age of this rock is 4440 million years. Olivine - Trace olivine Fo 65-67 is found with low-Ca pyroxene in “mafic clumps.” Anorthosite This white rock is composed almost entirely of crystals of one mineral, feldspar.

This is a thin section of one of a series of specimens very kindly sent to me from USA. Many thanks to the donor! This has come from an area dominated geologically by a large pre-cambrian anorthosite intrusion. Rounded-granular plagioclase and quartz with areas of intergrowth, with pink embayed garnet.

The 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. (b) Thin section of an olivine oikocryst adjacent to section (a) in cross-polarized light. The section is normal to the foliation and in the same plane as (a). (c) Section from the interior of an oikocryst into the matrix, digitized from photographs of three large thin sections, parts of two of which are shown in (a) and (b).

the Prioniodus elegnns Zone, which corresponds to the upper part of the Af. Impersistent thin concordent bands of amphibolite are associated with the above anorthosite zone abut against the sea, and thus the top of the complex is hidden 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.
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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.

The Buehler PetroThin is a thin section machine designed for sectioning a variety of samples.
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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

O. 3) yielded only 4 of pure plagioclase [9]. Of 100 Andesite.

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Anorthosite. Calciclasite ⓘ Labradoritite ⓘ Anorthitite ⓘ Foid-bearing-anorthosite ⓘ Troctolitic anorthosite ⓘ Charnockitic anorthosite; Foid-syenitoid. Foid-monzosyenite. Nepheline-monzosyenite …

Quartz anorthosite. The former rocks of this study are located in the southern part of TIB, in the late Olle Wallner, who without complaints prepared an endless row of thin sections. model for the origin of the gabbro-anorthosite-syenite-potassic granite suite. IGSN, Sample Type, Notes, Location, Number Thin Sections, Storage Location. GRD02YCS0, Microcline, Microcline var.