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doi:10.2204/iodp.proc.345.103.2014 DiscussionA preliminary geologic interpretation can be made from these data. The original model formed on the basis of the site survey microbathymetry (Ferrini, et al., 2013) and presented in the cruise proposal was that the Hess Deep bench forms a single coherent block or slab transported by dip-slip motion along a fault subparallel to the slope of the rift valley wall. The bench itself would thus represent the top of the fault block. Several scenarios for the dip fault were part of the initial planning for the expedition. The 3.5 kHz acoustic observations suggest that at a finer scale, the bench could include several smaller fault or slump blocks with a complicated structural relationship along and across strike. This arrangement would be typical of one or more landslide or mass wasting events, a geologic model that was considered in the course of the expedition based on a reinterpretation of the microbathymetry data and on petrologic and paleomagnetic observations (see the “Expedition 345 summary” chapter [Gillis et al., 2014a]). |
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