Chemical structure and history of the Earth: evidence from global non-linear inversion of isotopic data in a three-box model

Details Chemical structure and history of the Earth: evidence from global non-linear inversion of isotopic data in a three-box model Chemical structure and history of the Earth: evidence from global non-linear inversion of isotopic data in a three-box model

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..96...61a&link_type=abstract

Earth and Planetary Science Letters, Volume 96, Issue 1-2, p. 61-88.

Computer Science

38

Scientific paper

Recent contributions [1-4] have shown the important role of budget equations in improving the isotopic and chemical ratio determinations for the principal geochemical reservoirs on the Earth. We now combine information from both contributions (Sr-Nd isotopic couples [1,2] and the three Pb isotopic couples [3,4]) and complete them by adding the Hf and Os isotopic couples. The inversion of the budget equations and the model-ages-crustal age histogram relationships permits us to begin a systematics of the behaviour of chemical elements through the master geodynamical phenomenon of crust formation, and to calculate a parameter accounting for the ``large scale'' behaviour of each chemical element, that we call the sialic affinity. The use of a C1 chondrite chemical concentration set permits us to bound the concentration factor of the bulk silicate Earth to the depletion factor of the mantle. Using the best present estimates of the bulk Earth uranium content, we compute the size of the depleted reservoir; it is found to be larger than the upper mantle, defined to be above the 650 km discontinuity (about 1.2-1.6 times the upper mantle mass). This result implies that, for a layered Earth model, and exchange has occurred between the upper and lower mantles.

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