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- W56586938 abstract "Abstract Extremely fine-grained meta-anorthosites to anorthositic meta-basalts are found as sheets and lenses amongst meta-peridotitic komatiites, serpentinites and amphibolites of the c. 3.5 by Holenarasipur greenstone belt in Karnataka State. Their REE patterns show slight enrichment in LREE relative to HREE, La varying between 12 and 7 times and HREE between 3 and 4 times chondritic abundances, and the average (Ce/Yb)N ratio is 2.1. Their Eu content is variable, the Eu/Eu* ratio ranging from 1.2–9.0 and showing a strong negative correlation with modal amphibole. In such respects these supracrustal anorthositic rocks differ greatly from high-grade rocks of similar major element chemistry from West Greenland and NW Norway, but show a remarkable resemblance to lunar highland basalts. This resemblance is confirmed by close textural and other geochemical similarities. The relatively unfractionated nature of the anorthositic basalts suggests that they may represent anorthositic basalt melts within which small amounts of plagioclase accumulation has occurred. The origin of such melts is restricted by the REE data to two possibilities: (a) by small degrees of partial melting of very hydrous mantle peridotite; (b) by large amounts of olivine and orthopyroxene fractionation from peridotitic komatiite magmas." @default.
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- W56586938 date "1978-01-01" @default.
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- W56586938 title "Ree Distributions in Basaltic Anorthosites from the Holenarasipur Greenstone Belt, Karnataka, South India" @default.
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- W56586938 doi "https://doi.org/10.1016/s0166-2635(08)70107-5" @default.
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