Computer Science
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.2231m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 55, Issue 8, pp.2231-2239
Computer Science
4
Scientific paper
Glasses from submarine lavas of the Woodlark Basin (Southwest Pacific) have been analyzed for volatiles using dynamic high-temperature mass spectrometry. Abundances for H 2 O, Cl, F, S, and CO 2 in basaltic glasses with typical mid-ocean ridge basalt (MORB) compositions and rare high Na-high Ti(NaTi) basalts are reported. Compared to similar incompatible element-depleted MORB, the Woodlark Basin basalts have Cl contents (average 0.046 ± 0.005 wt%) which are enriched and, at similar Mg#, are even higher than those from most back-arc basin (BAB) settings. Glasses from near the Woodlark Spreading Center (WSC) have H 2 O abundances (average 0.210 ± 0.020 wt%) typical of most MORB, but those for the "NaTi" basalts recovered from a transform that intersects the Solomon Island arc are significantly higher (average 0.605 ± 0.020 wt%). The volatile data in the MORB are consistent with previous results from trace element and isotope studies which suggest that fluids introduced by subduction are not actively involved in the genesis of magmas along the present spreading center. Elevated Cl abundances may reflect some crustal assimilation during magmatic evolution, but the high H 2 O contents in NaTi basalts appear to be a primary feature associated with the enrichment of moderately incompatible elements in mantle-derived liquids. Least-squares mixing and Rayleigh fractionation calculations were used to evaluate the roles of fractional crystallization and partial melting. It appears that the Woodlark Basin basalts have at least three different sources. The petrogenesis of "NaTi" basalts remains enigmatic as no simple model for their origin can explain their chemical characteristics.
Aggrey Kwesi E.
Muenow David W.
Perfit Michael R.
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