Hf-Nd-Sr isotopes and incompatible element abundances in island arcs: Implications for magma origin and crust-mantle evolution
White, W.M.; Patchett, J. (1984). Hf-Nd-Sr isotopes and incompatible element abundances in island arcs: Implications for magma origin and crust-mantle evolution. Earth Planet. Sci. Lett. 67(2): 167-185
In: Earth and Planetary Science Letters. Elsevier: Amsterdam. ISSN 0012-821X; e-ISSN 1385-013X, more
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| Keywords |
Earth structure > Earth crust > Oceanic crust
Island arcs
Isotopes
Trace elements
Marine/Coastal |
| Abstract |
Conservative calculations show that the upper subducted slab (basal + sediment) passes beyond the arc magma genesis zone and enters the deep mantle with a minimum of 500-1000 ppm K, and corresponding amounts of other incompatible elements. If this material is not completely homogenized with the mantle and later becomes part of the source of ocean island magmas, then the ocean island arc isotopic similarity is a result of their similar mix of source materials-mantle peridotite with trace element signatures from oceanic crust and sediment. |
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