Genesis of jadeite-quartz rocks in the Yorii area of the Kanto Mountains, Japan

► Investigation of zircon in jadeite-quartz rocks from the Kanto Mountains, Japan. ► Jadeite-quartz rocks formed contemporaneously with the Jurassic accretionary complex. ► HFSE concentrated in jadeite-quartz rock prior to the fluid moving up into the mantle wedge. ► Jadeite-bearing rocks may be abundant in or above subducted slab.