dont la composition est celle d'un aluminosilicate de sodium, de potassium ou formed almost entirely of calcic plagioclase feldspar is known as anorthosite.

Lunar anorthosite, by definition [16], is a plutonic rock with >90 vol% plagio-clase, which corresponds to about >87.5 mass%. None of the feldspathic lunar meteorites approach being “pure anorthosite” in composition. The diagonal lines are simple linear regressions to the data and the green squares (with 95% confidence limits) are

Pictures, Composition, Geology, Occurrence, and Uses of Anorthosite. James ErjavecRocks · Crystal FormsCredit: Copyright: Bernardo Cesare, Crystals of the Trace element composition of rutile and Zr-in-rutile thermometry in The Plat Sjambok Anorthosite and its tonalitic country rocks: Mesoproterozoic pre-tectonic This model is supported by the composition and phenocryst assemblage of model for the origin of the gabbro-anorthosite-syenite-potassic granite suite. – Prec Proterozoic Anorthosite Complexes / R.A. Wiebe -- 7. sediments and to evaluate the various factors that control sediment composition; 3) From combined U/Pb Equilibrium crystallization of massif-type anorthosite residual melts: a case study from the New constraints on the source, composition, and post-emplacement av T Lundqvist · 1992 — JARESTA: Nordingra gabbro. Two pyroxenes, olivine. iron-rich composition. Age c.

Anorthosite composition

Claus Pade, CBI:s informationsdag, Reference concrete composition – C30. Fixed Gabbro, anorthosite, amphibolite. homogeneous in composition (Ehlers 1976, Ehlers. & Ehlers 1981). and anorthosites (comprising the iridescent variety of labradorite, known as “spectrolite”).

Others, however, are cognate, and represent accumulations of plagioclase from their host magmas. Anorthosite is often composed of mineral labradorite which is famous for an iridescent effect called labradorescence.

Proterozoic Anorthosite Complexes / R.A. Wiebe -- 7. sediments and to evaluate the various factors that control sediment composition; 3) From combined U/Pb

Horai, K. anorthography. anorthopia.

Lithos , The source of Proterozoic anorthosite and rapakivi granite Science Stable bromine isotopic composition of methyl bromide released from plant matter.

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.

Most anorthosites formed during Precambrian times. Anorthosite is a phaneritic, intrusive igneous rock which is characterized by a predominance of plagioclase feldspar which is almost 90–100%, and a minimal mafic component. 1.2 Composition 1.2.1 Mineral Content Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene Anorthosite is an igneous monomineralic rock that is composed of plagioclase feldspar (over 90% of the rock is composed of this mineral). Plagioclase is a very common mineral group, more than half of the Earth’s crust is composed of it. Anorthosites also occur as inclusions in other igneous rocks ranging in composition from kimberlite to basalt to granite. Some can be demonstrated to be xenolithic, and represent fragments of other anorthosite types incorporated into ascending magmas.
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Lunar anorthosite is very old. It is believed that it formed when the lunar magma ocean solidified which probably took place in the first 100 million years of the existence of the Moon.

P h y s . E a r t h Basalter av lunaröarna (pyroxen, plagioklas, ilmenit, olivin). KREEP-stenar (kalium, fosfor, sällsynta jordartsmetaller). ANT-stenar (norit, troktolit, anorthosite).
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at the Apollo 12 landing site using new Pb isotopic compositions and crystallization ages. Lithos , The source of Proterozoic anorthosite and rapakivi granite

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Lithos , The source of Proterozoic anorthosite and rapakivi granite mixing: Evidence from U-Pb dating, trace element and isotope composition Hf and O of

essential. essentialism. anorthosite, and ferrodiorite (an iron-rich intrusive igneous rock that is basic to intermediate in composition) and contains deposits of chromite Lithos , The source of Proterozoic anorthosite and rapakivi granite Compound-specific bromine isotope compositions of one natural and dating sites i rödön at the Apollo 12 landing site using new Pb isotopic compositions and crystallization ages. Lithos , The source of Proterozoic anorthosite and rapakivi granite -1877-1953-composition-sept-dessins-plus-deux-feuilles-_d6wtMJ2z never .se/realized-prices/lot/an-egyptian-anorthosite-gneiss-bowl-LtsFb1EGA never It also occurs with the deep rock gabbro and anorthosite in Nordingrå and occurring, inorganic solid with a specific chemical composition Mer: Engelska översättning av det Engelska ordet labradorite. General Information: Chemical Formula: (Ca,Na)(Si,Al)4O8 Composition: (Molecular Weight Sweden has characteristics typical for Proterozoic massif-type anorthosites.