Volatile abundances in basaltic glasses from seamounts flanking the East Pacific Rise at 21°N and 12-14°N

Details Volatile abundances in basaltic glasses from seamounts flanking the East Pacific Rise at 21°N and 12-14°N Volatile abundances in basaltic glasses from seamounts flanking the East Pacific Rise at 21°N and 12-14°N

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2115a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 8, pp.2115-2119

Computer Science

7

Scientific paper

Volatiles in glasses from seamounts flanking the East Pacific Rise (EPR) in the vicinity of 21°N and 12-14°N were analyzed by high-temperature mass spectrometry. Compared to mid-ocean ridge basalt (MORB) magmas erupted at the spreading axis of the EPR at 21°N, the seamount magmas are commonly enriched in H 2 O, Cl, F and S (at the same Mg#). Water and Cl abundances range from 0.111 to 1.021 wt.% and 0.003 to 0.226 wt.%, respectively. The wide range in abundances is consistent with the diversity of magmas erupted by these seamounts as indicated previously from major and rare-earth element data. H 2 O shows a strong linear positive correlation with K 2 O content [ H 2 O = 0.45 (±0.04) K 2 O + 0.22 (±0.03) with RMS error of 0.09]. Based on H 2 O / K 2 O -ratios and K 2 O abundances the glasses separate into three distinct groups: highly volatile-enriched alkalic/transitional, enriched tholeiitic, and depleted tholeiitic. Ratio-ratio plots of incompatible elements ( La / Sm vs. K 2 O / H 2 O ) indicate that these seamount magmas can all be related by the mixing of enriched and depleted source materials.

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