Physics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3816317s&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 16, CiteID L16317
Physics
1
Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Plate Motions: General (3040), Tectonophysics: Plate Motions: Present And Recent (3040), Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413), Tectonophysics: Tomography (6982, 7270)
Scientific paper
The geometry of subducted slabs that interact with the transition zone depends critically on the partitioning of the subduction velocity (vS$\perp$) at the surface into its subducting plate motion component (vSP$\perp$) and trench migration component (vT$\perp$). Geodynamic models of progressive subduction demonstrate such dependence with five distinct slab geometries and corresponding partitioning ratios (vSP$\perp$/vS$\perp$): slab draping (vSP$\perp$/vS$\perp$ ≤ 0.5), slab draping with recumbent folds (0.5 < vSP$\perp$/vS$\perp$ < ˜0.8), slab piling (˜0.8 ≤ vSP$\perp$/vS$\perp$ ≤ ˜1.2), slab roll-over with recumbent folds (˜1.2 < vSP$\perp$/vS$\perp$ < ˜1.5) and slab roll-over (vSP$\perp$/vS$\perp$ ≥ ˜1.5). The model findings have been applied to subduction zones in nature with well-resolved slab geometries, for which subduction partitioning ratios have been calculated during the last 20 million years in two global reference frames: the Indo-Atlantic and Pacific hotspot reference frames. The model-nature comparison determines in which reference frame subduction partitioning ratios are most in agreement with observed slab geometries. In the Indo-Atlantic frame, five (out of five) selected subduction zone segments with well-resolved slab geometries, plate velocities and trench velocities (Japan, Izu-Bonin, Mariana, Tonga, Kermadec) agree with the geodynamic model predictions, as calculated subduction partitioning ratios match the observed slab geometries. In the Pacific frame the partitioning ratio of only one subduction zone segment (Izu-Bonin) matches observations. It is thus concluded that the Indo-Atlantic hotspot reference frame is preferred over the Pacific one as a subduction zone reference frame in which to describe plate motions, subduction kinematics and mantle flow.
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