نتایج جستجو برای: andalusite
تعداد نتایج: 131 فیلتر نتایج به سال:
Bafgh Mishdovan ore body is located in the Central Iranian zone and is recognized as potential of the sillimanite group minerals. In this region, the outcrops of the different formations can be observed which mainly consist of the Precambrian metamorphic rocks. Silimanite group minerals are existed in the schistic rocks. The area is located in a tectonized zone and subjected to regional metamor...
Contact metamorphism in the Shahindezh Metamorphic Core (SMC), which is occurred due to intrusion of Pichaghchi granodiorite during Laramian orogeny (Upper Cretaceous), is studied here. The well deve loped mineral parageneses at the aureo le is quatz + plagioclase + biotite + cordierite ± chlorite ± K-feldspar ± muscovite ± andalusite ± sillimanite ± garnet. Pressure and temperature of the...
Microstructural and petrographical features as well as field relations, show that formation of the metapelitic rocks of Bolandparchin and Poshtuk in northwestern Iran was poly-metamorphic. Mineral assemblages in the metapelites of two areas are different. The Bolandparchin schists are graphite-rich and have dark color. Peak metamorphic assemblage is garnet, biotite, staurolite, aluminosilicate ...
Intrusion of the Chahghand gabbrodiorite in regionally metamorphosed rocks of the Sanandaj-Sirjan zone in NE of Neyriz has caused contact metamorphism. A variety of pelitic hornfelses are formed as a result of thermal metamorphism. Spatial distribution of minerals in the Chahghand aureole defines three mineralogical zones namely cordierite, andalusite and sillimanite zones. Study of metamo...
The mechanism of fibrolite formation in metapelitic rocks of the contact aureole of Mashhad granite is examined in this study. According to textural features, fibrolite considered to be disharmonious. Textural evidence strongly suggests that most of the fibrolite in this aureole are formed by decomposition of biotite. Fibrolite produced late in the thermal history of the aureole through a react...
In order to improve the corrosion resistance of aluminosilicate refractories by molten aluminum, alkaline fluoride NaF and cryolite Na3AlF6 powders were studied. Both physical and chemical properties are known to influence wetting and corrosion behavior. This paper devoted to determine the influence of alkaline fluoride and cryolite added to andalusite based castable on the reaction with a...
In the Khibiny and Lovozero alkaline massifs, there are numerous xenoliths of so-called ‘aluminous hornfelses’ composed uncommon mineral associations, which, firstly, ultra-aluminous, secondly, highly reduced. (K,Na)-feldspar, albite, hercynite, fayalite, minerals phlogopite-annite cordierite-sekaninaite series, corundum, quartz, muscovite, sillimanite, andalusite rock-forming minerals. Fluorit...
A systematic experimental evaluation of several approaches to multiple-quantum MAS NMR was performed for spin-5/2 nuclei using (27)Al NMR of the aluminosilicate andalusite and the porous aluminum phosphate AlPO(4)-14 as model. Experiments were conducted in the fields of 9.4 and 17.6T using magic-angle spinning frequencies up to 30kHz and rf-field strengths of 250 and 120kHz. Numerical SIMPSON o...
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