Abstract
The time constants are calculated which rule the evolution of Nd isotopes in a model Earth composed of the continental crust, a depleted upper mantle and a pristine lower mantle and in which the upper mantle is not constrained to grow or not to grow at the expense of the lower mantle. The growth rate of the continental crust is calculated to be 1.8 ± 0.7 km 3/ yr, with 2.5 ± 0.5 km 3/yr of new crust addition from the mantle and 0.8 ± 0.5 km 3/yr of sediment entrainment at subduction zones. The characteristic times for Nd evolution in the depleted mantle and continental crust imply that the Sm-Nd system evolves far from steady state.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
