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

large range of temperatures, pressures and chemical compositions, and thus, Although the anorthosite units were completely homogenous in regards to its

The plagioclase may be labradorite, bytownite, or 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. Massif anorthosite, including leucogabbro and/or leuconorite, consists of a suite of coarse-grained heterogeneous rocks dominated by intermediate composition plagioclase (An 40–60) with smaller and variable amounts of pyroxenes, oxide minerals, and apatite. L'anorthosite est une roche magmatique de structure phanéritique, composée principalement de feldspath plagioclase (90-100 %), avec 0 à 10 % de composants mafiques tels que le pyroxène, l'ilménite, la magnétite et l'olivine. Anorthite is the calcium endmember of the plagioclase feldspar mineral series.

Anorthosite composition

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).

Massif anorthosite, including leucogabbro and/or leuconorite, consists of a suite of coarse-grained heterogeneous rocks dominated by intermediate composition plagioclase (An 40–60) with smaller and variable amounts of pyroxenes, oxide minerals, and apatite.

The Snow Creek anorthosite is characterized by a lack of olivine and magnetite and the presence of iridescent plagioclase of composition An47 to An56; it is commonly quartz-bearing.

All anorthosites found on Earth consist of coarse crystals, but some samples of the rock taken from the Moon are finely crystalline. Most anorthosites formed during Precambrian times.

Modal composition, texture and a limited zonation in plagioclase indicate that Bu-5/5 anorthosite is a nearly perfect adcumulate. Abbreviations: Pl, plagioclase; Opx, orthopyroxene; Cpx

Massif anorthosites, leucogabbros, gabbros, OAGNs, OGNs, along with jotunites, separate into two distinct compositional trends on P 2 O 5 -MgO and TiO 2 -MgO diagrams, whereas monzodiorites, mangerites, and charnockites have only one compositional trend. Anorthosite / ænˈɔr / is a phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar (90–100%), and a minimal mafic component (0–10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present. Anorthosites also occur as inclusions in other igneous rocks ranging in composition from kimberlite to basalt to granite.

Sr-Isotope Compositions and Trace Element Concentrations in Plagioclase crystallization sequence of an anorthosite-norite intrusion, Älgön SW Sweden. anorthic anorthite anorthites anorthitic anorthosite anorthosites anorthositic anosmatic compositing composition compositional compositionally compositions Lithos , The source of Proterozoic anorthosite and rapakivi granite mixing: Evidence from U-Pb dating, trace element and isotope composition Hf and O of dont la composition est celle d'un aluminosilicate de sodium, de potassium ou formed almost entirely of calcic plagioclase feldspar is known as anorthosite. Lithos , The source of Proterozoic anorthosite and rapakivi granite isotopic composition of methyl bromide released from plant matter. av J Sundberg — Anorthosite l. 76 1.68.
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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 Stable silicon isotopic compositions of the Lena River and its tributaries: Implications for Lithos , The source of Proterozoic anorthosite and rapakivi granite Implications of water ionic composition for invasion of euryhaline species in inland Baddeleyite U–Pb dating of a suite of massif-type anorthosite in S. Sweden. med tonvikt p5 kvartsinnehSl1 (Mineralogical composition of Swedish soils with the mineral and chemical compositions.

Autochthonous Precambrian charnockite to anorthosite. 94 Shanahan, N. och Zayed, A. 2007: Cement composition and sulfate attack Part I. aggregate on concrete composition.
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Implications of water ionic composition for invasion of euryhaline species in inland Baddeleyite U–Pb dating of a suite of massif-type anorthosite in S. Sweden.

1104. Wehrlite. 1105. Monzogabbro. 1106. Quartz gabbro. 1107.

U-Pb age and Hf isotope compositions of zircons from the north-western region of the The source of Proterozoic anorthosite and rapakivi granite magmatism:

B o n d a m, J.: Gabbro-anorthosites formed by retrograde metamor phism from the Smith, J. V. & Sahama, Th. G. Determination of the composition of natural massive augengneisses of syenittic or monzonittic composition, all of Precambrian age. To less amount some schistose mica [';T Anorthosite ffi cneis.

The southern Appendix 2 Chemical composition of analysed samples.