Other
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2501a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 10, pp.2501-2506
Other
3
Scientific paper
Glasses from submarine lavas of the North Fiji and Lau back-arc basins were analyzed by high-temperature mass spectrometry for volatiles. Abundances for H 2 O, Cl, F,S and CO 2 in glasses ranging in composition from depleted, primitive MORB to enriched, transitional tholeiites are reported. The samples divide into three groups based on K 2 O vs. H 2 O, Ba/Zr vs. H 2 O and K 2 O/H 2 O vs. P 2 O 5 /H 2 O variation diagrams. At similar Mg#, the least evolved samples studied are nearly identical to N-type MORB in H 2 O abundances but show Cl contents enriched by a factor of 5. More enriched samples, classified as back-arc basin basalts (BABB) on the basis of major/trace elements and isotopes, are not as hydrous (at similar Mg#) as those from the Mariana and East Scotia Sea back-arc basins. The data indicate that not all back-arc basins erupt lavas with the distinct volatile and other elemental characteristics of lavas from the Mariana Trough and Scotia Sea.
Aggrey Kwesi E.
Muenow David W.
Sinton John M.
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