Variations of the K / Rb ratio in migmatitic paragneisses of the Northwest Adirondacks

Details Variations of the K / Rb ratio in migmatitic paragneisses of the Northwest Adirondacks Variations of the K / Rb ratio in migmatitic paragneisses of the Northwest Adirondacks

Oct 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969gecoa..33.1203w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 33, Issue 10, pp.1203-1211

Computer Science

8

Scientific paper

Data for the migmatitic paragneisses of the Northwest Adirondacks indicate fractionation of potassium and rubidium during metamorphism and migmatization; total rock K / Rb ratios are controlled to a significant degree by modal composition. Biotite-poor granitic veins and lenses show K / Rb ratios averaging 431 in contrast to the host gneisses which have an average K / Rb ratio of 271. Paragneisses from the zone of granulite facies metamorphism show significantly higher (mean 307) K / Rb ratios than those from the amphibolite facies (231), indicating the possibility of regional depletion in Rb relative to K under intensive metamorphic conditions.

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