Volcanic gaps due to oblique consumption of aseismic ridges

Amos Nur, Zvi Ben-Avraham

Research output: Contribution to journalArticlepeer-review

Abstract

The present-day consumption of oceanic ridges and other buoyant rises and fragments at circum-Pacific subduction zones, and presumably elsewhere, are closely related to existing gaps in volcanism. Examples are the gaps associated with the Nazca, Juan Fernandez, Cocos, Marcus-Necker and Louisville ridges. The buoyancy of these ridges breaks the continuity of the subducted plate, which may lead to reduced water supply required for melting of magma, and therefore create temporary volcanic gaps. The oblique consumption of these ridges causes the gap to migrate with time. This mechanism may be useful in interpreting time-space patterns of past volcanic chains associated with subduction in terms of the consumption of the disruptive oceanic plateaus and ridges.

Original languageEnglish
Pages (from-to)355-362
Number of pages8
JournalTectonophysics
Volume99
Issue number2-4
DOIs
StatePublished - Dec 1983
Externally publishedYes

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