The competing effects of olivine and orthopyroxene CPO on seismic anisotropy

Orthopyroxene is the second most abundant mineral in upper mantle and, like olivine, can form crystallographic preferred orientations (CPO) during deformation that may influence seismic anisotropy. Here we use a compilation of 21 peridotites which both olivine and orthopyroxene CPOs are preserved to document range CPO types explore their effects on anisotropy peridotites. In addition four previously published types, this study establishes three new two result fast axes aligned parallel lineation direction shear/flow. We calculate bulk elastic tensors for each sample from measured CPOs, those turn Vp Vs velocities percentages. order relative anisotropy, these properties were calculated possible modal percentages, 100% orthopyroxene. While effect appears be negligible orientation axes, presence increasing decreases anisotropic signal overall. However, at very low mutually destructive, where mostly rock actually decrease