OXYGEN THERMOBAROMETRY OF ABYSSAL SPINEL PERIDOTITES - THE REDOX STATE AND C-O-H VOLATILE COMPOSITION OF THE EARTHS SUB-OCEANIC UPPER MANTLE

We have applied the spinel peridotite oxygen barometer to abyssal spinel peridotites from the mid-Atlantic, central Indian, southwest Indian and American-Antarctic ocean ridge systems. The results indicate that the oxygen fugacity (fO2) of the suboceanic mantle is on average 0.9 ± 0.7 (n = 33; ± 1sd...

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Bibliographic Details
Published in:American Journal of Science
Main Authors: Bryndzia, L, Wood, B
Format: Article in Journal/Newspaper
Language:unknown
Published: 2016
Subjects:
Antarctic
Antarctic Ocean
Indian
Antarc*
Online Access:https://doi.org/10.2475/ajs.290.10.1093
https://ora.ox.ac.uk/objects/uuid:25dbe951-b660-49ff-9f52-9dbe8b38ccfe
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Summary:We have applied the spinel peridotite oxygen barometer to abyssal spinel peridotites from the mid-Atlantic, central Indian, southwest Indian and American-Antarctic ocean ridge systems. The results indicate that the oxygen fugacity (fO2) of the suboceanic mantle is on average 0.9 ± 0.7 (n = 33; ± 1sd) log units below the Fayalite-Magnetite-Quartz (FMQ) fO2 buffer. Suboceanic mantle is more reduced than the subcontinental mantle. -from Authors

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