Antiperthite and mantled feldspar textures in charnockite (enderbite) from S.W. Nigeria. Am. Mineralogist (1965) Philpotts A.R. Origin of the anorthosite-mangerite rocks in Southern Quebec. J. Petrol. (1966) There are more references available in the full text version of this article.
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ادامه مطلبkinetics of the plagioclases, antiperthite texture has not received as great attention as the perthite textures from research workers. Development of antiperthite both by exsolution and replacement processes is accepted (Deer et el., t963). An exsolution origin for the antiperthites in granulite facies rocks has been considered by Sen (1959).
ادامه مطلبThe antiperthite and mesoperthite occur in felsic domains of the Zhengjiapo BIF ore and enable derivation of peak temperature metamorphic conditions.
ادامه مطلبThe exsolution microtexture of antiperthite grains with bulk compositions Or 17–21 An 33–26 from pelitic granulites from the Highland Complex of Sri Lanka were studied by optical methods. The most common K-feldspar rods are oblique to the c axis by about 5° and obviously nucleated at pre-existing albite-twin boundaries. Where no …
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ادامه مطلبThe pelitic granulite is composed of plagioclase including antiperthite or ternary-feldspar (~55%), garnet (~15–20%), quartz (~15–20%), biotite (~5%), sillimanite …
ادامه مطلبantiperthite, perthite, and mesoperthite in related metapelite from the Voronezh Crystalline Massif also indicated UHT metamorphic conditions exceeding 1000 C [8]. The Th-U-Pb dating of monazite from these metapelitic schists revealed an age between ~2015 and
ادامه مطلبReports of antiperthite orientation in the literature. have consisted . of flat-stage measurements of the an-gular relationship . between . the long dimension of. blebs and . cleavage or . twin .
ادامه مطلبAntiperthite: Plagioclase host (albite and/or oligoclase) with orthoclase lamellae. Mesoperthite: Nearly equal amounts of alkali and plagioclase feldspars "True" or "regular" perthite and antiperthite textures can be similar, and these textures can be distinguished by size. Perthites By Intergrowth Size
ادامه مطلبOther articles where antiperthite is discussed: feldspar: Chemical composition: …over the plagioclase constituent, whereas antiperthite is the name given to intimate mixtures in which the plagioclase constituent is predominant. Perthites are common, whereas antiperthites are relatively rare.
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ادامه مطلبAntiperthite exsolution texture, in which K-feldspar has unmixed from a plagioclase host. In this case the rock is a somewhat deformed diorite, and the exsolved K-feldspar lamellae have annealed somewhat into angular shapes.
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ادامه مطلبThe meaning of ANTIPERTHITE is a feldspar rock consisting of plagioclase containing lamellae of orthoclase.
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ادامه مطلبAntiperthite porphyroblast shows intergrowth of two feldspars: exsolved lamellae of K-feldspar within the host grain of plagioclase ... The fresh rock samples were crushed in a steel crusher, and a shaking bed and heavy liquid techniques (CHBr 3) were used to concentrate heavy minerals. Zircon and monazite grains were picked up from the ...
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ادامه مطلبthe formation of antiperthite is applicable to these rocks. A model basecl on nucleation is suggested for the antiperthitic ptagioclase in potash-deficient gneiss.
ادامه مطلبPetrographic description of antiperthite The K-feldspar in antiperthites occurs as flattened rod-shaped blebs in the host plagioclase (Fig. l). Three bleb orientations can sometimes …
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ادامه مطلبEARTH AND PLANETARY SCIENCE LETTERS 11 (1971) 23-27. NORTH-HOLLAND PUBLISHING COMPANY LUNAR ANTIPERTHITES M.G. BOWN and P. GAY Department of Mineralogy and Petrology, University of Cambridge, England Received 27 October 1970 Revised version received 3 February 1971 Antiperthitic intergrowths have …
ادامه مطلبPhase diagram of the alkali feldspar system which exhibits such exsolution behavior at low temperatures. At high temperatures the diagram shows that albite (Ab) or NaAlSi 3 O 8 …
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ادامه مطلبAccording to this idea of Kohler, the phenomenon described by ROBERTSON (1959) and mentioned in the foregoing paragraph could better be called antiperthite, if only because the plagioclase or albite phase is more important than the alkali-feldspar phase.
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