Role of subducted sediments in island-arc magmatism: constraints from REE patterns |
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| Authors: | Scott M McLennan SR Taylor |
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| Institution: | Research School of Earth Sciences, Australian National University, Canberra, A.C.T. Australia |
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| Abstract: | Continental sedimentary rocks of post-Archean age are characterized by europium depletion relative to the other REE. Typical values for Eu/Eu* are 0.65±0.05 (where Eu* is the theoretical value for no chondrite-normalized Eu anomaly).Basalts and andesites from island-arc suites rarely display significant europium anomalies. Calculations indicate that the maximum amount of sediment that can be admixed without producing a signature of Eu depletion is: (a) 10% for a MORB source; (b) 1% for primitive mantle or a single-stage depleted mantle, and (c) 0.1–0.3% for a two-stage depleted mantle. |
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