Texture investigations on geological anorthosite specimens with the triclinic plagioclase-type structure have been performed by neutron diffraction po…

Silicate textures and compositions and metal-silicate relationships. Geochimica et Cosmochimica Acta 35(1): 5-34. (Jan 1971); Weigand, P. W. (1975) Pyroxenes in the Patwar mesosiderite: Meteoritics 10(4): 341-351.

Here you can know more about texture of Gneiss and Anorthosite. Texture of Gneiss is Banded, Foliated, Platy whereas that of Anorthosite is Foliated, Glassy. Based on the texture of rocks, they are used for various purposes. Quantitative texture analysis of an anorthite (polycrystalline plagioclase feldspar) has been under takenusinganoptical microscopeequippedwithauniversal stage. Themicrostructurewasstudiedon three orthogonal sections.

Anorthosite texture

Roche magmatique plutonique hololeucocrate, à texture grenue, composée de 80 à 90 % de plagioclases (andésine, labrador, bytownite) et d'un peu de L'anorthosite est une roche magmatique de structure phanéritique, composée principalement Elles se distinguent des anorthosites protérozoïques par leur texture et leur composition minéralogique. Leur trait le plus caractéristique 7 May 1971 Nearly monomineralic anorthosite, with plagioclase Anso. This is the most common texture of the anorthosites. The homogenous crystals and 1 août 2010 textures, associated rocks and tectonic environments of anorthosites allow Primordial, Archean and Proterozoic anorthosites are distinctly Leur texture montre que le magma dont elles proviennent a cristallisé rapidement ou assez rapidement, Roches de la série anorthosite-norite-troctolite (ANT).

2010-01-01 · Massive anorthosite has adcumulate texture comprising tightly packed cumulus plagioclase with accessory (<10 vol%) abundances of intercumulus pyroxene and Fe-Ti oxide. The mesocumulate texture that characterizes leucogabbronorite-leuconorite is defined by higher proportions of intercumulus pyroxene and Fe-Ti oxide.

Sep 10, 2014 The lunar highland samples with pure anorthosite and the PAN Images of the magnesian anorthosite with granulitic breccia texture in Dhofar Sedimentation structures, microscopic textures and the phase petrology provide conclusive evidence of the igneous origin of the rocks and of the crystal breccia 62237 showing possible igneous texture in troctolitic anorthosite clast. Although extensively crushed, large crystals of plagioclase (up to 3 mm) and Compositions (An(50+10)), textures (lathy plagioclase) and settings (emplaced into continental rather than oceanic crust) effectively distinguish Proterozoic from anorthosite (~98% plagioclase). Dixon and Papike.

Commonly, anorthosites form at the tops of modally graded layers on the scale of several meters up to 100 meters or more. Grain size (typically <1 cm) is characteristically smaller than the massif-type or Archean anorthosites, and textures vary from orthocumulates with tabular crysts of plagioclase to adcumulates having equant polygonal grains.

The Laramie anorthosite complex includes three anorthositic plutons: the Poe Mountain, Chugwater, in zones of intense alteration, a texture suggesting that.

These textures are formed by a core of Ol, which is separated from Pl by an inner rim of Opx and an outer rim of amphibole-spinel symplectite. Texture investigations on geological anorthosite specimens with the triclinic plagioclase-type structure have been performed by neutron diffraction pole figure scanning. Representative pole figures of four specimens originating from different locations of the large massif-type Gruber anorthosite, Antarctica, are presented and discussed.
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The Bethampudi layered anorthosite complex at the border zone of Archaean internal structure and texture, nature and composition of plagioclase feldspar [1] B. Anorthosite/leucogabbronorite showing mottled texture due to recrystallization of pyroxene and plagioclase. (CG84-300), C. Anorthosite/ leucogabbronorite The mode of emplacement of massif-type anorthosite plutons has been a topic of study granitoid gneisses, lead to a porphyroclastic (augen) texture in outcrop. The Laramie anorthosite complex includes three anorthositic plutons: the Poe Mountain, Chugwater, in zones of intense alteration, a texture suggesting that. Porosity, Luster, Strength etc which defines it. The physical properties of Anorthosite rock are vital in determining its Anorthosite Texture and Anorthosite Uses.

Anortosit, anorthosit eller ibland labradorsten, är en magmatisk, intrusiv djupbergart, som till mer än 90 % är uppbyggd av fältspat ().Också pyroxen samt mindre mängder av oxider som magnetit, ilmenit och olivin förekommer.
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Such textures have been quantified in a troctolite-anorthosite from the Proterozoic Lac-St-Jean anorthosite complex, Canada. Crystal size distributions (CSDs) indicate that initially plagioclase nucleated and grew in an INTRODUCTIONenvironment of linearly increasing undercooling, producing a straight-The textures of plutonic rocks are one of their most line CSD.

Many of the anorthosite samples returned by astronauts from the Moon have a similar crumbly texture, not because of weathering by water but due to impact shock and shattering by meteorite bombardment. Anorthosite is similar to these rocks: Basalt, Harzburgite, Granite and more. Topic.