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Fate of Forearc Lithosphere at Arc-Continent Collision Zones: Evidence From Local Earthquake Tomography of the Sunda-Banda Arc Transition, Indonesia

Abstract : A new 3-D seismic P wave velocity model of the Sunda-Banda Arc Transition from local earthquake tomography reveals (i) northward subduction of oceanic lithosphere, associated with the convergence of Australia and Sundaland, as a high-velocity zone extending down to ~200 km depth; (ii) two distinct low-velocity zones, one immediately above the slab, which is likely a zone of partial melt, and one in the 0-40 km depth range, which is probably a magma chamber associated with active volcanoes above; and (iii) a northerly dipping high-velocity zone that bisects the two low-velocity anomalies, which we interpret as an underthrust forearc sliver of continental origin. Based on He3/He4 measurements from volcanic outflows, it is possible that the magma supply is contaminated by interaction with this forearc sliver as it ascends from the melt region below.
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Submitted on : Wednesday, June 29, 2022 - 7:52:36 AM
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P. Supendi, A. D. Nugraha, S. Widiyantoro, C. I. Abdullah, N. Rawlinson, et al.. Fate of Forearc Lithosphere at Arc-Continent Collision Zones: Evidence From Local Earthquake Tomography of the Sunda-Banda Arc Transition, Indonesia. Geophysical Research Letters, 2020, 47, ⟨10.1029/2019GL086472⟩. ⟨insu-03707761⟩

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