Potassium variation across the New Britain volcanic arc

Details Potassium variation across the New Britain volcanic arc Potassium variation across the New Britain volcanic arc

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..31..184j&link_type=abstract

Earth and Planetary Science Letters, Volume 31, Issue 1, p. 184-191.

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Scientific paper

Late Cainozoic volcanoes of the New Britain island arc overlie an inclined Benioff zone that extends to a depth of at least 580 km. The rocks are tholeiitic basalt, andesite, dacite, and rhyolite. Unlike many other examples of island arcs described in the literature, K2O contents in rocks with the same SiO2 content do not increase progressively as depth, h, to the New Britain Benioff zone increases. The most complex relationships between K2O, SiO2, and h are shown by volcanoes overlying the deeper part of the Benioff zone. In these, the K2O contents of rocks containing more than about 60% SiO2, decrease as depth to the Benioff zone increases. The New Britain volcanic arc provides a striking exception to the generalisation that K-h relationships are essentially similar in all island arcs.

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