GLORIA survey of the oceanic-continental transition of the Havre-Taupo back-arc basin |
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Authors: | Ian Wright Lionel Carter Keith Lewis |
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Institution: | (1) New Zealand Oceanographic Institute, DSIR, Private Bag, Kilbirnie, Wellington, New Zealand |
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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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