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alkali feldspar

   Also found in: Encyclopedia 0.01 sec.
alkali feldspar
Any of several feldspar minerals containing alkali metals and little calcium. Plagioclase, orthoclase and microcline are alkali feldspars.
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A typical rapakivi texture consists of plagioclase-mantled alkali feldspar megacrysts (ovoids) and two generations of quartz and feldspar.
Surface weathering of rapakivi granite outcrops--implications for ... by Harma, Paavo; Selonen, Olavi / Estonian Journal of Earth Sciences
Plagioclase dramatically removes Sr at intermediate stages and alkali feldspars sequester Ba and Rb as late-stage trachytes and phonolites form in alkaline magmas.
Igneous rock associations 4. Oceanic island volcanism I mineralogy ... by Mallory-Greenough, Leanne M. / Geoscience Canada
As a rule, the alkali feldspar measurements give somewhat higher ages than OSL from quartz, which can be explained by slower bleaching of the feldspar in the sunlight exposure.
Application of OSL and [sup.10]Be techniques to the establishment of ... by Raukas, Anto / Proceedings of the Estonian Academy of Sciences: Geology
 
 
 
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