The generation of oxidized CO 2 -bearing basaltic melts from reduced CH 4 -bearing upper mantle sources

Details The generation of oxidized CO 2 -bearing basaltic melts from reduced CH 4 -bearing upper mantle sources The generation of oxidized CO 2 -bearing basaltic melts from reduced CH 4 -bearing upper mantle sources

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.4931b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 22, pp.4931-4940

Other

14

Scientific paper

Redox states of asthenospheric basaltic melts suggest that the asthenosphere is more oxidized than the lithosphere. Theoretical considerations, on the other hand, require the opposite, i.e., that the asthenosphere is more reduced. The implication is that the f O 2 range of basaltic melts at the Earth's surface cannot reflect the f O 2 range of their mantle sources at depth. We present evidence to show that the asthenosphere is significantly more reduced than the lithosphere. Mantle whose oxygen fugacity is buffered predominantly by ferric-ferrous iron equilibria will experience reduction with increasing depth, due to 1. (1) the negative contributions to free energy from molar volume changes. 2. (2) effects of phase transitions on the chemical potentials of the ferric iron components in solid solution. The extent of reduction per GPa unit pressure increase is modeled to be on the order of 0.6-0.8 log 10 -bar units in f O 2 relative to the FMQ buffer. Basaltic melts experience oxidation during melt segregation and decompression relative to their mantle sources. The redox state of a basaltic melt at the Earth's surface is roughly proportional to the depth of first mantle melting.

Affiliated with

Also associated with

No associations

Rating

The generation of oxidized CO 2 -bearing basaltic melts from reduced CH 4 -bearing upper mantle sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The generation of oxidized CO 2 -bearing basaltic melts from reduced CH 4 -bearing upper mantle sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The generation of oxidized CO 2 -bearing basaltic melts from reduced CH 4 -bearing upper mantle sources will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1023806