Abstract
Abstract. Turbidite deposition along slope and trench settings is evaluated for the Cascadia and Sumatra–Andaman subduction zones. Source proximity, basin effects, turbidity current flow path, temporal and spatial earthquake rupture, hydrodynamics, and topography all likely play roles in the deposition of the turbidites as evidenced by the vertical structure of the final deposits. Channel systems tend to promote low-frequency components of the content of the current over longer distances, while more proximal slope basins and base-of-slope apron fan settings result in a turbidite structure that is likely influenced by local physiography and other factors. Cascadia's margin is dominated by glacial cycle constructed pathways which promote turbidity current flows for large distances. Sumatra margin pathways do not inherit these antecedent sedimentary systems, so turbidity currents are more localized.
Highlights
Sedimentation of active margins is commonly dominated by order to maximize the potGenteiaol sfocr iseucncteisfsicthrough careful core site deposits isselneocttiMothne.oWpdrhienilcleipDthleeeftvoeccetuolsonoipcf imtnhtieesrpnpraetptaetri,oint of is these theseM turbidite systems
Core suffixes are as follows: piston cores (PC), jumbo cores (JC), trigger cores (TC), gravity cores (GC), Kasten cores (KC), box cores (BC), and multi cores (MC). Piston coring includes both the PC or JC and the TC, so they generally come in pairs
We examine the base of slope apron cores at the base of Rogue Canyon, cores 01JC, 30PC, and 31PC
Summary
Sedimentation of active margins is commonly dominated by order to maximize the potGenteiaol sfocr iseucncteisfsicthrough careful core site deposits isselneocttiMothne.oWpdrhienilcleipDthleeeftvoeccetuolsonoipcf imtnhtieesrpnpraetptaetri,oint of is these theseM turbidite systems. During sea level high stands, or for regions interpretations (and correlation of deposits) which allow us isolated from terrestrial sedimentation processes, these systems may principally be driven by seismic cycles (Nelson et al, 2011; Goldfinger et al, 2012). The prism’s mor- trigger rationale in Cascadia are found elsewhere (Goldfinger phology in turn is driven by convergence rate, plate coupling, et al, 2012) and we discuss correlations and seismogenic rabackstop strength, upper plate rheology, and lower plate to- tionale for Sumatra in this paper. These correlations are used pography and sedimentation history
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