Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5783522 | Geochimica et Cosmochimica Acta | 2017 | 63 Pages |
Abstract
Lithium and boron budgets for the silicate Earth are presented that are based on isotope and element mass balance. A refined estimate for the B isotopic composition of the bulk continental crust is given as δ11B=-9.1±2.4â°. Mass balance allows the existence of recycled B reservoirs in the deep mantle, but these are not required. However, mass balance among the crust, sediments and seawater shows enrichment of 6Li in the surface reservoirs, which requires the existence of 7Li-enriched material in the mantle. This may have formed by the subduction of altered oceanic crust since the Archaean.
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Authors
Horst R. Marschall, V. Dorsey Wanless, Nobumichi Shimizu, Philip A.E. Pogge von Strandmann, Tim Elliott, Brian D. Monteleone,