K Rb fractionation by plagioclase feldspars

V. Rama Murthy*, W. L. Griffin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Calcic plagioclases from basaltic-gabbroic rocks and anorthosites exhibit a strong fractionation of K and Rb. The trend of K Rb ratio with K content is similar to that shown by oceanic tholeiites. Such a K-Rb relationship is not shown by metamorphic plagioclase. High K Rb ratios in gabbroic or anorthositic rocks may not indicate a "mantle" origin but may only reflect partitioning of K and Rb between liquid and plagioclase. The K Rb ratios in stone meteorites appear to be largely controlled by their constituent plagioclase.

Original languageEnglish
Pages (from-to)265-271
Number of pages7
JournalChemical Geology
Issue numberC
Publication statusPublished - 1970
Externally publishedYes


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