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Univ. Chicago, Dep. Geophys. Sci., Chicago, IL, United States
Textural and mineralogical evidence of crystal fractionation from evolving aluminous magma; Ca and P increase in garnet as Cr and Ti decrease in most spinels. Several parental magmas. Corundum in alkremites contains 0.1-0.2 wt.% TiO 2 , 0.2-0.5 Cr 2 O 3 , and 0.5-1.2 Fe 2 O 3 . Mica (0.7-3.4 TiO 2 ) in grain boundaries is secondary. Foundering or subduction of Al-rich sediments (perhaps chloritized ocean crust) may have generated local Al enrichment in the upper mantle to provide diverse source regions for alkremite magmas.--Modified journal abstract.
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  D. SMITH and W. L. GRIFFIN Garnetite Xenoliths and Mantle-Water Interactions Below the Colorado Plateau, Southwestern United States J. Petrology, September 1, 2005; 46(9): 1901 - 1924. [Abstract] [Full Text] [PDF]
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