Geochemistry of Lavas from the Emperor Seamounts, and the Geochemical Evolution of Hawaiian Magmatism from 85 to 42 Ma

Abstract

The Hawaiian-Emperor Seamount Chain (ESC), in the northern Hawaiian plume was situated beneath young, thin lithosphere, the degree of melting within the plume was greater, and incompatible Pacific Ocean, was produced during the passage of the Pacific Plate over the Hawaiian hotspot. Major and trace element concentrations trace element depleted, refractory mantle components contributed more to melting. and Sr-Nd-Pb isotopic compositions of shield and post-shield lavas from nine of the Emperor Seamounts provide a 43 Myr record of the chemistry of the oldest preserved Hawaiian magmatism during the Late Mesozoic and Early Cenozoic (from 85 to 42 Ma).