منابع مشابه
Cathodoluminescence Characterization of Maskelynite and Alkali Feldspar in Shergottite
IN SHERGOTTITE. M. Kayama, T. Nakazato, H. Nishido, K. Ninagawa and A. Gucsik Research Institute of Natural Sciences, Okayama University of Science 1-1 Ridai-cho, Okayama, 700-0005, Japan ([email protected]), Department of Applied Physics, Okayama University of Science 1-1 Ridai-cho, Okayama, 700-005, Japan, Max Planck Institute for Chemistry, Department of Geochemistry, Joh.-J. Becherweg 27...
متن کاملRoutine characterization and interpretation of complex alkali feldspar intergrowths†k
Almost all alkali feldspar crystals contain a rich inventory of exsolution, twin, and domain microtextures that form subsequent to crystal growth and provide a record of the thermal history of the crystal and often of its involvement in replacement reactions, sometimes multiple. Microtextures strongly influence the subsequent behavior of feldspars at low temperatures during diagenesis and weath...
متن کاملFirst-principles investigation of the lattice vibrations in the alkali feldspar solid solution
The heat capacities of Al, Si ordered alkali feldspars of different Na, K compositions were calculated using the density functional theory. The effect of the Na, K distribution, if random, ordered or clustered, on the resulting heat capacity was investigated on different cells with Ab50Or50 composition. For all compositions and distributions studied, the excess heat capacity of mixing is positi...
متن کاملPetrogenesis of A-type granites and origin of vertical zoning in the Katharina pluton, Gebel Mussa (Mt. Moses) area, Sinai, Egypt
The central pluton within the Neoproterozoic Katharina Ring Complex (area of Gebel Mussa, traditionally believed to be the biblical Mt. Sinai) shows a vertical compositional zoning: syenogranite makes up the bulk of the pluton and grades upwards to alkalifeldspar granites. The latters form two horizontal subzones, an albite–alkali feldspar (Ab–Afs) granite and an uppermost perthite granite. The...
متن کاملLattice strain across Na–K interdiffusion fronts in alkali feldspar: an electron back-scatter diffraction study
Cation exchange experiments between gem quality sanidine [Formula: see text] and KCl melt produced chemical alteration of alkali feldspar starting at the grain surface and propagating inwards by highly anisotropic Na-K interdiffusion on the alkali sublattice. Diffusion fronts developing in b-direction are very sharp, while diffusion fronts within the a-c-plane are comparatively broad. Due to th...
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ژورنال
عنوان ژورنال: Journal of the Mineralogical Society of Japan
سال: 1992
ISSN: 1883-7018,0454-1146
DOI: 10.2465/gkk1952.21.161