Inference on terrestrial genesis from molybdenum isotope systematics

Abstract

It has been suggested that a genetic relationship exists between the Earth and enstatite chondrites. The discovery of non mass dependent molybdenum isotope anomalies (Mo-w) at a macroscopic scale raises the possibility of using this element as a tracer of genetic relationships. We have determined the molybdenum isotopic compositions of enstatite chondrites (EH and EL) and terrestrial lavas presumably derived from the deep mantle (Loihi seamount, Hawaii). The molybdenum isotopic compositions are identical, suggesting a common source reservoir. The conclusion is that although distinct, the Earth shares similarities with enstatite chondrites from a chemical and isotopic point of view because both formed in the inner regions of the solar system.