نتایج جستجو برای: sillimanite
تعداد نتایج: 179 فیلتر نتایج به سال:
Different models are discussed to interpret the presence of kyanite as a stable phase in contact aureoles especially in the andalusite-, sillimanite-bearing aureoles. In such aureoles the polymorphic sequence kyanite → andalusite → sillimanite can be explained in terms of an essentially isobaric path during which kyanite initially crystallises from the breakdown of pyrophyllite or more likely m...
the relations of fibrolite-biotite are discussed by presenting data from the ardara aureole, nw ireland. biotite-fibrolite intergrowths are developed in all three aureole zones including: the outer kyanite-bearing andalusite zone, the middle kyanite-free andalusite zone and the inner prismatic sillimanite zone. a strain-assisted mechanism is proposed for the fibrolitisation of biotite in the ar...
Kirkpatrick, R. J. (1981) In Kinetics of Geochemical Processes (A. C. Lasaga and R. J. Kirkpatrick, eds.). Mineral. Soc. Am. Washington, DC, 321-98. Kohli, C. S., and Ives, M. B. (1972) J. Crystal Growth, 16, 123-30. Kuo, L.-C., and Kirkpatrick, R. J. (1983) EOS, Trans. Amer. Geophys. Union, 64, 349. Lacmann, R., Franke, W., and Heimann, R. (1974) J. Crystal Growth, 26, 106-16, 117-21. Lofgren,...
Applications of state-of-the-art computer simulations to important Earthand rock-forming minerals (Al2SiO5 polymorphs, albite (NaAlSi3O8), and MgSiO3 perovskite) are described. Detailed introductions to equations of state and elasticity, phase transitions, computer simulations, and geophysical background are given. A new general classification of phase transitions is proposed, providing a natur...
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...
Surface samples have been collected from Kerala coast, Valapatanam-Azhikode deposit of northern Kerala coast. The average heavy minerals percentage shows 30.32 %. The heavy mineral assemblage of samples from area showed an appreciable percentage of opaque followed by sillimanite and zircon. The chemical analysis carried out for the present investigation, is detailed as Ferrian ilmenite. X-ray d...
The study area is located about 110 kilometers southeast of Mashhad and approximately 40 kilometers southeast of Fariman. The area is considered to be a part of the central Iran zone. It includes metamorphic rocks with different protoliths consisting of pelitic, carbonate and quartz - feldspathic rocks. The metamorphism in the study area is considered to be a contact regional metamorphism with ...
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