2017-11-03

Massif anorthosite • Layring is not found in massif 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 …

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). Rocks under the Microscope. Some common rock types as seen under the microscope.

Anorthosite thin section

Anorthite is the calcic end member of the plagioclase feldspar series. In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). You can find the explanation on the plagioclase feldspar page. Anorthite weathers quite readily, so it’s not terribly abundant on Earth. Unfortunately, these thin sections are thicker than the usual 30 micrometers, and in crossed polarizers (XPL) the plagioclase has colors of the upper first order, instead of the usual grey.

Thirty polished thin sections from all major lithological units were examined Jan 19, 2017 - Photomicrograph of a thin section showing twinned, aligned plagioclase in anorthosite. A coarse grained igneous rock, anorthosite is Anorthosite; Norite, feldspathic pyroxenites; Harzburgite, Dunite (ultramafic in thin section; It may occur as independent prisms or as crusts on the pyroxene. 14.

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

Cosmochim. Acta 46, 1591-1601. Ryder G. (1990) Lunar samples, lunar accretion and the early bombardment of the Moon.

Small “clumps” of mafic minerals are in the hand specimen, but these are not represented in the thin sections. The composition of this rock is given in table 6. The age of this rock is 4440 million years. Olivine - Trace olivine Fo 65-67 is found with low-Ca pyroxene in “mafic clumps.”

2017-11-03 Anorthite. Anorthite is the calcic end member of the plagioclase feldspar series.

BRECCIA volcanic light grey CO. 7. BRECCIA marble variegated, Italy.
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ANORTHOSITE white course grained plagioclase MT. 3. APALITE fine pink CO. 4. BASALT olivine, La Bajada Hill NM Quarternary. 5. BASALT scoriaceous NM recent flow.

Unfortunately, these thin sections are thicker than the usual 30 micrometers, and in crossed polarizers (XPL) the plagioclase has colors of the upper first order, instead of the usual grey.
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Proterzoic: Sedex och BIF, anorthosite-hosted Ti avsättningar You look at a thin section that consists almost entirely of secondary K-feldspar and biotite?

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

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the plants, originally planted as part of the work, had grown A polished thin section of c. of feldspar (anorthosite), with the cleavage face of the crystals.

Thin Sections and polished section. Chondrite L4. Tagounite 001, Morocco 1999 sample 2. Polished section. Chondrite H5 Sahara 97095. Thin section. Chondrite H3, Brownfield 1937. Polished section.

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2013-10-27 · 2 thoughts on “ Anorthosite from Parc Roghadal, Isle of Harris (UK Grid Ref: NG 05571 84902) ” Michael Yeaman May 16, 2016 at 2:17 am. 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.

BRECCIA chert in silica dolomite matrix . 11 Ryder G. (1982) Lunar anorthosite 60025. Geochim. Cosmochim. Acta 46, 1591-1601. Ryder G. (1990) Lunar samples, lunar accretion and the early bombardment of the Moon. EOS March 6, 313-315.