Deformation and Exhumation at Convergent Margins: The by Uwe Ring

By Uwe Ring

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The only difference for the Yolla Bolly terrane on the regional scale is that shortening in the Z direction is about one-third smaller (15% versus 23%). Contouring of all data reveals an overall subhorizontal attitude for X and Y in the Yolla Bolly terrane and the Central Belt. Consequently, the Z-axes show a subvertical maximum. The principal directions of the average strain tensor (open symbols in Fig. 20) yield a similar result. However, the principal directions of the Deformation and Exhumation at Convergent Margins: The Franciscan Subduction Complex 31 Figure 20.

1 × 200 km, as the lower and upper limits). In comparison, Engebretson et al. –1. In other words, SMT deformation appears to have accounted for <1% of the total convergence across the Franciscan margin. Thus, SMT TABLE 6. y. 0 7% χdot —rate of thinning owing to erosion and shallow normal faulting (δdot + λdot). φdot —rate of thinning for whole wedge owing to vertical ductile thinning. adot —rate of basal accretion (χdot + φdot). , erosion and normal faulting). φ—total exhumation owing to ductile flow.

This is not the case for the averages of the strain magnitude, because of the directional properties of strain. Also note that the tensor averages are centered with respect to the distribution of SV but offset on the low side with respect to γoct. The reason is that variability in the principal directions at the local scale is averaged out at the regional scale so that the regional-scale average shows less distortional strain than the distribution of local values would suggest. Overall, Figure 21D suggests that removal of rock volume does not significantly affect the amount of work needed to deform the rock.

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