Fluorine contents of some hydrous minerals derived from upper mantle and lower crust |
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| Authors: | Ken-Ichiro Aoki Satoshi Kanisawa |
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| Institution: | 1. Institute of Mineralogy, Petrology and Economic Geology, Tohoku University, Sendai, Japan;2. Department of Earth Sciences, College of General Education, Tohoku University, Sendai, Japan |
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| Abstract: | Fluorine contents have been determined in about forty samples of amphibole, mica and apatite in alkali basalt and kimberlite and their incorporated xenoliths. They show a wide variation ranging from 15,000 to 100 ppm, corresponding to about 40 to 0.2 per cent substitution of F for OH in hydroxyl site of hydrous minerals. Fluorine abundances in these minerals reflect those of their host magmas or rocks; Itinome-gata xenoliths are the lowest and South African kimberlites and their xenoliths are the highest. F/OH and also. D/H (Kuroda et al. 1975) ratios in coexisting phlogopite-potassic richterite from peridotite and mica nodules are thoughts to have formed under no simple equlibrium conditions. |
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