Flame perthite
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 … 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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WebDESCRIPTION: Perthite is the name given intimate intermixtures of a potassium feldspar (KAlSi 3 O 8 ) – either microcline or orthoclase – and the sodium-rich plagioclase feldspar albite (NaAlSi 3 O 8 ), with potassium … WebFlame perthite is the dominant feldspar microtextures in samples of Dongargarh granitoids. One of the special feature observed is a twined K-feldspar grain, which is separated by a thin calcite vein (~1 μm in width). In this sample, perthite lamella is radiating from the direction of orientation of calcite vein (Fig 2d).
WebMay 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 … WebWechat. Abstract. AbstractMicroprobe analyses of feldspars in granite mylonites containing flame perthite give compositions that invariably plot as three distinct clusters on a …
WebMay 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 … WebPerthite is an intergrowth of albite, oligoclase, plus orthoclase or microcline. The characteristic texture is produced by unmixing from high temperature. The appearance of …
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WebAbstract Microprobe analyses of feldspars in granite mylonites containing flame perthite give compositions that invariably plot as three distinct clusters on a ternary feldspar diagram: orthoclase (Or92–97), albite and oligoclase-andesine. The albite occurs as grains in the matrix, as flame-shaped lamellae in orthoclase, and in patches within ... greenacre bowling club nswWebComposition of flame perthite from Malanjkhand granitoid plotted on triangular Ab-Or-An diagram shows high-albite to high-andesine type (Fig. 3a). In case of Dongargarh granitoids, flame perthites ... greenacre bowlingWebFlame 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 ... flowering green onionsWebSep 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). greenacre brightonWebThe perthite texture around every poin~ in a perthite crystal is compared with the pictures in the album. It is very easy to determine to what group of flowering grass with purple flowersWebPerthite. 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 … greenacre buildingWebdeveloped extensive flame perthite in K-feldspar. Albite flames show large variation in size, shape and abundance. Field, petrographic and chemical evidence suggests … greenacre building supplies