Sur la répartition des feldspaths potassiques dans les roches éruptives et métamorphiques de la région d'Avallon

Caillère, Simonne; Kraut, François

doi:10.3406/bulmi.1960.5370

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“…368-370), and especially Martin (1974). Specific examples of how knowledge of feldspar structural states has aided in interpreting the petrogenesis of igneous rocks include Caillere & Kraut (1960), Dietrick (1962, Wright (1967), Tilling (1968), Ragland (1970) and Parsons & Boyd (1971); analogous studies of metamorphic feldspar suites include Scotford (1969), Hipple (1971), Crosby (1971) and Guidotti, Herd & Tuttle (1973). Illustrations of the relations of structural states of plagioclases to the crystallization histories of chondritic meteorites and lunar rocks are found in Van Schmus & Ribbe (1968), Gooley et al (1974) and Smyth (1975).…”

Section: Genetic Controls O N Feldspar Orderingmentioning

confidence: 99%

Structural state of detrital alkali feldspars

Suttner

Basu

1977

Sedimentology

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The structural state of an alkali feldspar is determined by the nature of the distribution of Al and Si in the tetrahedral sites of the feldspar structure. This state is a function of a number of genetic controls including temperature, cooling rate, deformation, crystal size, and several chemical factors. Together these controls constitute a genetic regime. Identification of the structures of detrital feldspars may enable recognition of genetic regimes and be useful in provenance interpretation and mineral province definition. A 2‐peak method of X‐ray diffraction (XRD) determination as a variant of an earlier proposed 3‐peak method of structural state determination is used in this study. Total analytical time for each determination is about 50–55 min per grain. Results of structural state identification of 126 detrital feldspars from Holocene stream sands derived from volcanic, plutonic and metamorphic rocks are presented in order to illustrate the application and potential of the technique. Detrital feldspars from the metamorphic rocks are all maximum microcline; those from the plutons range from orthoclase to microcline depending on the age of the pluton, whereas those from the volcanic rocks are sanidines.

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