Computer Science
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..70..196m&link_type=abstract
Earth and Planetary Science Letters, Volume 70, Issue 2, p. 196-206.
Computer Science
49
Scientific paper
High-sensitivity stepped extraction reveals two isotopically distinct forms of carbon in submarine basalt glasses: an isotopically light carbon component released by combustion from 200 to 600°C and an isotopically heavy CO2 liberated from vesicles (magmatic carbon) from 600 to 1200°C. The δ13CPDB of the low release temperature carbon varies from -24 to -30‰ and is believed to be surficial organic contamination. A survey of various types of oceanic glasses demonstrates that the δ13C of magmatic CO2 varies from -4.2 to -7.5‰ in mid-ocean ridge basalt (MORB), from -2.8 to -6.7‰ in glasses from Hawaii and Explorer Seamount and from -7.7 to -16.3‰ in glasses from the Scotia Sea and Mariana Trough. Magmatic CO2 in back-arc basin basalts (BABB) is on average 5‰ lighter than equivalent CO2 in MORB and can be explained by the mixing in the source regions for BABB magmas of juvenile (MORB-like) CO2 with an organic carbon component from subducted pelagic sediments. It is inferred that significant amounts of pelagic carbonate carbon (δ13C ⋍ 0‰) must be recycled into the mantle.
Carr Robert H.
Mattey David P.
Pillinger Colin T.
Wright Ian P.
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