Abstract
Understanding the trace element and isotopic compositions of individual lithologies subducted to the subarc mantle is indispensable to constrain the geochemical models for subduction-zone material recycling. Recent petrographical studies focusing on trace element distributions between minerals in subduction-related metamorphic rocks occurring as a coherent regional metamorphic belt have pointed out that the trace elements were preferably partitioned into accessory minerals. However, these rocks commonly suffered varying extents of mineralogical and chemical overprinting during their exhumation. Here we report such trace element distributions by using eclogite xenoliths from the Colorado Plateau, because they represent fragments of the subducted oceanic crust, and they are mostly free from the effect of retrogressive overprinting due to the rapid entrainment by kimberlite-like magma.
