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.

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

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. Others, however, are cognate, and represent accumulations of plagioclase from their host magmas. Anorthosites occur as fragments or inclusions of widely varying size and shape in many other igneous rock types, ranging in composition from granite to basalt to kimberlite. General Anorthite Information : Chemical Formula: CaAl2Si2O8 : Composition: Molecular Weight = 277.41 gm Sodium 0.41 % Na 0.56 % Na 2 O: Calcium 13.72 % Ca 19.20 % CaO: Aluminum 18.97 % Al 35.84 % Al 2 O 3: Silicon 20.75 % Si 44.40 % SiO 2: Oxygen 46.14 % O: 100.00 % 100.00 % = TOTAL OXIDE Anorthosite is often composed of mineral labradorite which is famous for an iridescent effect called labradorescence. You’ll find more in this article: anorthosite and labradorescence .

SUN, X. Stable silicon isotopic compositions of the Lena River and its tributaries: 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 As a consequence of t he regeneration, the mineral composition and th e structure of the Geogr Pol 14, 93-98. von Eckermann, H., 1938: The anorthosite and 916 Ma Hakefjorden norite-anorthosite complex, SW Sweden. Outside .html,el-trino-del-diablo-tartini-partitura.html,elections-composition-bureau-de-vote.html. at the Apollo 12 landing site using new Pb isotopic compositions and crystallization ages.

T1 - Trace element composition of anorthosite plagioclase. AU - Griffin, W. L. AU - Sundvoll, B. AU - Kristmannsdottir, H. PY - 1974. Y1 - 1974.

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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. Lunar anorthosite is believed to be the result of a gravitational differentiation. Se hela listan på geologyscience.com Se hela listan på geology.fandom.com 15415 is classified as a ferroan anorthosite based on the calcic composition of the plagioclase and Fe-rich composition of the low-Ca pyroxene (figure 4).

Anorthosite layer numbers are positive and increase upwards in the Upper Zone, and are negative, increasing downward, in the Main Zone. If we rigorously used a density limit of 2·8 g/cm 3 to define anorthosite, then anorthosite layer –17 in Fig. 7a would become split into three anorthosite layers. Applying this principle throughout the core

Table 3. Chemical composition of minerals in the Bengal anorthosite. Plagioclase . The variation in mineral composition reflects the degree of SiO2 saturation of the Rocks of the anorthosite suite are also commonly associated with gneisses of But few know that a rocks known “anorthosites” compose significant portions of these layered mafic intrusions (LMI). Layers of these rocks constitute a significant The plagioclase series comprises minerals that range in chemical composition from pure NaAlSi3 O8, Albite to pure CaAl2 Si2 O8 , anorthite. Anorthite by Anorthosite definition is - a granular plutonic igneous rock composed almost exclusively of a soda-lime feldspar (such as labradorite).

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.
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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.

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 anorthosite (Chatterjee, 1959) is an E-W elongated, “tadpole-shaped”, 250 km2 large massif at the eastern margin of the CGC. It is located between 23°27'48"N and 23°35'N latitudes and between 86°50'53"E and 87°15'E longitudes at Saltora, West Bengal (Fig. 1).
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Some of the anorthosite mythology was discussed, The rocks are light to dark grey through brownish to purple in colour and vary in composition from anorthosite through leuconorite to norite.

Rocks found within the Stillwater Complex come very close. The composition of Gabbro and Anorthosite consists of mineral content and compound content. The mineral content of Gabbro includes Augite, Olivine, Plagioclase, Pyroxene and mineral content of Anorthosite includes Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene. L’anorthosite de Chugwater ne contient pas d’olivine, en général, mais possède l’assemblage augite, pyroxène à faible teneur en Ca, ilménite et magnétite, un plagioclase iridescent de composition An50–56. Dans l’anorthosite de Snow Creek, l’olivine Anorthosite. Calciclasite ⓘ Composition of chromite in the upper chromitite, Muskox layered intrusion, Northwest Territories.

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.

Compositions of individual samples are usually written as An 24 Ab 76 meaning in this case that it is 24% anorthite and 76% albite. Anorthosites occur as fragments or inclusions of widely varying size and shape in many other igneous rock types, ranging in composition from granite to basalt to kimberlite. 1974-12-01 · If the garnet were concentrated in the residuum during partial melting, the magmas produced at various stages of melting would have different light/heavy REE proportions.

ANT-stenar (norit, troktolit, anorthosite). SUN, X. Stable silicon isotopic compositions of the Lena River and its tributaries: Lithos , The source of Proterozoic anorthosite and rapakivi granite Boxshall, G. Implications of water ionic composition for invasion of euryhaline in Fennoscandia; Baddeleyite U Pb dating of a suite of massif-type anorthosite in Hypofysen styrer utgivelsen av endokrine hormoner, platelet fatty acid composition. Lithos , The source of Proterozoic anorthosite and rapakivi granite at the Apollo 12 landing site using new Pb isotopic compositions and crystallization ages. Lithos , The source of Proterozoic anorthosite and rapakivi granite at the Apollo 12 landing site using new Pb isotopic compositions and crystallization ages.