Flame perthite
WebSep 1, 1996 · Copyright 1996 Eisevier Science Ltd INTRODUCTION Flame perthite (Fig. 1) is one of many morphologies of K-feldspar and albite intergrowths, but differs from most other perthite morphologies in that it is generally found in deformed quartzo-feldspathic rocks (e.g. Dat et al. 1978, Passchier 1982, Stel 1986). WebFlame perthite bearing K-feldspar is common. Braid and vein perthites occur occasionally. Paleopiezometry estimation indicates that flame perthite formed under the influence of low to moderate ...
Flame perthite
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WebSep 1, 1996 · In flame perthites from deformed granites within the Grenville Front Tectonic Zone, replacement is driven by retrograde breakdown of plagioclase and hydration of K … http://www.minsocam.org/MSA/AmMin/TOC/Articles_Free/1999/Vernon_p1760-1765_99.pdf
WebPerthite is an intergrowth of albite, oligoclase, plus orthoclase or microcline. The characteristic texture is produced by unmixing from high temperature. The appearance of … WebPasschier (1985) described flame perthites in which the distribution of flames was directly related to the amount of deformation within a K-feldspar grain, the model, flames grow by replacement behind a coherently propagating tip; the external stress influences the free energy of the process and thereby controls the orientation and extent of …
WebPerthite. Perthite is the name given to an intergrowth of K-feldspar and albite-rich plagioclase that is produced by exsolution of the plagioclase from the potassium feldspar … WebWechat. Abstract. AbstractMicroprobe analyses of feldspars in granite mylonites containing flame perthite give compositions that invariably plot as three distinct clusters on a …
WebJan 1, 1995 · Abstract. Flame perthites from greenschist-facies mylonites have been examined using SEM backscattered-electron (BSE) images and electron-channelling …
http://www.minsocam.org/MSA/AmMin/TOC/Articles_Free/1999/Vernon_p1760-1765_99.pdf#:~:text=Flame%20perthite%20is%20abundant%20locally%20in%20the%20high-grade,that%20has%20not%20been%20replaced%20extensively%20by%20symplectite. cloudfront streaming videoWebJul 7, 2024 · It is found only in young volcanic discharges or (volcanic) rocks (rhyolite, trachyte and dacite). It forms by the crystallization of lava at high temperatures and its rapid cooling. Sanidine crystallizes orthoclase … byzantine fathersWebMay 19, 2015 · Three varieties of perthites have been identified in these granitoids i.e. flame, braid, and vein types. Flame perthite bearing K-feldspar is common. Braid and … cloudfront streaming pricingWebMay 19, 2015 · Paleopiezometry estimation indicates that flame perthite formed under the influence of low to moderate differential stress on granitoids. Most of the perthites occurs in these granitoids are compositionally albite to oligoclase in nature. The composition ranges X Ab: 0.98–0.49 for the Malanjkhand and X Ab: 0.96–0.49 for Dongargarh granitoids. byzantine fairy talesWebMay 21, 2016 · Flame perthitic albite This is a special kind of perthitic albite, which was occurring in K-feldspar of deformed granites in the greenschist facies. It has the same … byzantine fathers of the fifth centuryWebPetrography and physicomechanical properties of alkali granites, alkali quartz syenite, and nepheline syenite from Ambela, NW Pakistan, have been investigated. Whereas the alkali quartz syenite and most of the alkali granites are megaporphyritic, the byzantine fashionsWebmicrocline twinning, (g) myrmekite, (h) flame perthite, (i) boudinage of strong minerals, typically with recrystallized aggregates of weaker minerals (e.g. quartz and mica) between the boudins, (j) foliation passing through, rather than around enclaves, and (k) heterogeneous strain with local mylonitic zones. cloudfront test