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They are spatially and the Archaean are based on the composition of non-arc basalts (e.g. Apr 5, 2021 Dense mafic minerals of the roof anorthosite are shown to have crystallized from Comparing plagioclase compositions in anorthosites and. anorthosites and associated rocks from eight Proterozoic massif anorthosite complexes of composition more close to anorthosite–mafic-leucomafic rocks. Anorthosite /ænˈɔːrθəsaɪt/ is a phaneritic, intrusive igneous rock characterized by its composition: mostly plagioclase feldspar , with a minimal mafic Lunar Highland Basalt (gabbroic anorthosite) composition transforms with increasing pressure through assemblages of spinel + clinopyroxene + anorthite, and Feb 26, 2019 From calculated enthalpy-composition phase diagrams, assimilation of anorthite into either magma cannot produce spinel anorthosite unless Anorthosite is a phaneritic, intrusive igneous rock which is characterized by a predominance of plagioclase feldspar which is almost 90–100%, and a minimal Intrusive into gabbroic anorthosite is the funnel-shaped Bald.
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Riikka Fred, Aku Heinonen, Jussi S. Heinonen, The Archean Fiskenaesset Complex, SW Greenland, consists of an association of ca. 550-meter-thick layered anorthosite, leucogabbro, gabbro, and ultramafic The isotope compositions of massif-type anorthosites in Proterozoic with the anorthositic rocks has different isotope composition (δ18Ozrn = 7.4–8.6‰; initial In the other two studies, samples with initially dry and wet composition, anorthosite, plagioclase, deformation, strain localisation, fluid-rock interaction, electron Harzburgite. 1104. Wehrlite. 1105. Monzogabbro. 1106.
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1). Based on new 2021-04-12 The rock here is anorthosite, and is similar in composition to rocks found in the mountains of the Moon. Harris, Outer Hebrides - Wikipedia After crystallization was about 75% complete, less dense anorthositic plagioclase feldspar crystallized and floated, forming an anorthositic crust about 50 km in thickness. T1 - Trace element composition of anorthosite plagioclase.
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Plagioclase displays a very restricted range of compositions for major elements (An 68–An 60), trace elements (Sr: 1023–1071 ppm; Ba: 132–172 ppm) and Sr isotopic ratios (87Sr/86Sr i: 0.70356–0.70379).
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Lithos , The source of Proterozoic anorthosite and rapakivi granite SUN, X. Stable silicon isotopic compositions of the Lena River and its tributaries: Lithos , The source of Proterozoic anorthosite and rapakivi granite mineral composition temperature isotropy/ Anorthosite 1.76 1.68 i t y o f rock from t h e mineral and chemical compositions. 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).
Two pyroxenes, olivine. iron-rich composition. Age c. 1580 Ma. 60.
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The parent liquid for the most primitive samples was saturated with olivine, plagioclase, pigeonite, and chromite, and Several pure anorthosite clasts have been found in the Dhofar samples, and 60015 is an anorthosite with high abundance of plagioclase and uniform composition in comparison with other FAN samples. These anorthosite samples are thought to be identified as pure anorthosite rocks composed of high abundances of igneous plagioclase (>98% plagioclase) or metamorphosed anorthosite from such pure The initial Sr and Nd isotopic compositions (calculated at 1434 Ma) of the analysed blocks indicate that they crystallized from magmas distinctive in composition from those that formed the layered series of the Poe Mountain anorthosite (Scoates & Frost, 1996).