Abstract
A GLORIA (Geological Long-Range Inclined Asdic) side-scan sonar survey, covering 23,000 km2, provides the first complete imagery of an active and contiguous, oceanic to continental back-arc system, namely, the Havre Trough to Taupo Volcanic Zone (TVZ) New Zealand. Havre Trough tectonism and volcanism relates to a series of laterally discontinuous, mutiple spreading rifts which terminate southward at the 3-km-deep Ngatoro Basin. A 45-km sinistral offset attributed toen echelon synthetic shearing separates the basin from the actively spreading TVZ. Sonographs reveal a youthful and complex volcanic seascape with 20 newly discovered seamounts, whereas flanking regions are mantled with a largely featureless mud blanket.
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Wright, I., Carter, L. & Lewis, K. GLORIA survey of the oceanic-continental transition of the Havre-Taupo back-arc basin. Geo-Marine Letters 10, 59–67 (1990). https://doi.org/10.1007/BF02431023
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DOI: https://doi.org/10.1007/BF02431023