J.P. Brandenburg, Erik H. Hauri, Peter E. van Keken, Chris J. Ballentine (2008). ""A multiple-system study of the geochemical evolution of the mantle with force-balanced plates and thermochemical effects." EARTH AND PLANETARY SCIENCE LETTERS 276: 1-13.

 Isotope ratios measured in oceanic basalts may provide important information on the fate of oceanic crust after subduction.  We couple a dynamic model of thermochemical convection in the mantle to a geochemical model for isotopic evolution.  Mechanically strong plates are included, extraction of oceanic crust is explicitly linked to divergent plate boundaries and secondary removal to a continental crust reservoir is linked to convergent plate boundaries.  The isotopic evolution of the U-Pb, Th-Pb, Nd-Sm, Rb-Sr, and Re-Os systems are simulated in this framework.  As in similar studies, changes in the extraction systematic of continental crust with time are necessary to reproduce the distribution of present day Pb isotopes.  However, the simultaneous and consistent use of these five isotope systems reveals that the part of the mantle array not involving subducted sediments is perhaps best explained as a mixture between DMM, HIMU and EM-1 like components.  In order to make a comparison with actual data rather than an interpretation, PetDB was an excellent source of information for the more depleted end of the spectrum. - J. P. Brandenburg

 

J.P. Brandenburg, Erik H. Hauri, Peter E. van Keken, Chris J. Ballentine (2008). ""A multiple-system study of the geochemical evolution of the mantle with force-balanced plates and thermochemical effects." EARTH AND PLANETARY SCIENCE LETTERS 276: 1-13.doi:10.1016/j.epsl.2008.08.027



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