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Journal of Petrology Volume 42 Number 4 Pages 847-851 2001
© Oxford University Press 2001

Comment on ‘Mexican Peridotite Xenoliths and Tectonic Terranes: Correlations among Vent Location, Texture, Temperature, Pressure, and Oxygen Fugacity’ by J. F. Luhr & J. J. Aranda-Gomez (1997)

DOMINIQUE LATTARD,*

MINERALOGISCHES INSTITUT DER UNIVERSITÄT, INF 236, D-69120 HEIDELBERG, GERMANY

This comment addresses the interpretation of oxygen fugacity data for spinel peridotite xenoliths from five Mexican volcanic fields presented by Luhr & Aranda-Gomez (Journal of Petrology, 38, 1075–1112, 1997). The postulated east–west increase of the {Delta}FMQ (‘relative oxygen fugacity’, where FMQ is fayalite–magnetite–quartz) values is inherent to the method and therefore of questionable geological significance. Increases in {Delta}FMQ do not necessarily mirror oxidation processes in the mantle controlled by subduction-related fluids.

KEY WORDS: mantle metasomatism; Mexico; peridotite xenoliths; relative oxygen fugacity


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