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The dynamic evolutions of fluid mineral systems driving large scale geochemical transformations in the Earth s crust remain poorly understood We observed experimentally that successive sodic
The purpose of this paper is to explore the role of perthitic texture in controlling dissolution of alkali feldspars We used a feldspar single crystal from the alkali feldspar solid solution series Na K[AlSi 3 O 8] exhibiting perthitic features on various scales as a model paper tries to make extensive use of extant literature data and previous work to
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Einige Minerale die aus mehreren Komponenten bestehen weisen eine temperaturabhängige Mischbarkeit auf Bei hohen Temperaturen herrschen Bedingungen vollständiger Mischbarkeit und es bildet sich ein einziger Mischkristall
The alkaline phase intrusion that covers southern Sinai is comprised of intraplate alkaline high level granites and syenites and their volcanic equivalents The granitic rocks exposed in the study area include an earlier pink coloured phase and a younger red coloured phase both intruded by doleritic dykes Masses of riebeckite and rapakivi granite have been
Alkali feldspars rank with quartz and plagioclase as the most common minerals in the earth s crust Chemically they are represented by the formula K Na AlSi 3 O chemical end member KAlSi 3 O 8 Or includes the minerals orthoclase microcline and K rich sanidine; and the end member NaAlSi 3 O 8 Ab is the mineral albite
and alkalifeldspar quartz and plagioclase also show graphic texture Porphyritic biotite granite Field and Megascopic Studies Porphyritic biotite granite is the major rock type covering about 70 percent of the total area It is the southern continuation of Kalama Taung
The range of partition coefficients published for K feldspar and plagioclase feldspar show that the uptake of U Th and Rb during crystallisation leads to lower concentrations of U and Th in K feldspar than plagioclase feldspar Table 1 and references therein Therefore it is usually assumed that the internal dose rate of K rich feldspars will mostly originate from K
Abb 1 Die lichtoptische Aufnahme zeigt Alkalifeldspat aus dem Plattengneis des Steinbruches Prettner Eine mechanische Beanspruchung bewirkt einmal die Zerbrechung eines ursprüng
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Orthose; Orthose altered by sericite PPL image 2x Field of view = 7mm Orthose with carlsbad twinning XPL image 2x Field of view = 7mm Perthite unmixing in orthose
An alkali feldspar granite Požega granite of reddish colour occurs in northern Croatia in the Cretaceous suture zone Sava Zone between the collided plates of Europe and Adria Africa
A subgroup of the Feldspar Group poor in calcium and mostly rich in is mostly used in petrology for the high temperature series from sanidine to high albite; the series is incomplete at low temperature but normal albite orthoclase and microcline are generally still included as alkali feldspars Some workers eg the Strunz classification include barium feldspars celsian and
カリ KAlSi 3 O 8 とナトリウム NaAlSi 3 O 8 のにするの。 ケイとアルミニウムのにし ではであるが になるととなる。 アルカリはカリウム ナトリウムのとのによってされる。
Alkali feldspar is the third most abundant mineral in Earth s crust With the exception of rare very rapidly cooled volcanic alkali feldspars and some near end member crystals that grew at diagenetic temperatures almost all natural alkali feldspar crystals exhibit various intracrystal exsolution and twin microtextures that developed during their geological history
The North China Craton NCC one of the oldest cratons in the world Liu et al 1992 and the largest one in China Zhai and Santosh 2011 has attracted considerable attentions in recent years due to the complicated amalgamation during early Precambrian time Kusky 2011 Santosh 2010 Zhai and Santosh 2011 Zhao et al 2012 Zhao and Zhai
Nach beiden Diagrammen kann ein einheitlicher Alkalifeldspar der Gesamtzusammensetzung 0r80 eingetragen als ausgefülltes Quadrat bei den angegebenen Drucken über 6oo° C gebildet werden Bei sinkender Temperatur erfolgt sehr knapp unter 6oo° C perthitische Entmischung
カリのと カリの カリのと のうち、カリと そうちょうせき NaAl Si 3 O 8 のをアルカリとぶ。したは、 K x Na 1 x AlSi 3 O 8 x=0 1 とされる。 ではなのがするが、では
The Uromia Dokhtar Magmatic Arc UDMA is a northwest southeast trending magmatic belt which is formed due to oblique subduction of Neotethys underneath Central Iran and dominantly comprises magmatic rocks The Jebal e Barez Plutonic Complex JBPC is located southeast of the UDMA and composed of quartz diorite granodiorite granite and alkali
The studied monzogranites and alkalifeldspar granites of W Hawashia North Eastern Desert of Egypt occur as small granitic mass intruding the granodiorites The monzogranites represent the central part of the mapped area and are intruded by the alkalifeldspar granites forming a small mass or cupola at the roof of the monzogranites
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