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Abstract Details

(2020) Spatial and Temporal Variations in Mantle Source and Subduction Contributions in the Southern Cascade Arc: Insights from Mafic Magma Geochemistry

Johnson E, Shaffer J, Cole M, Ramos F & Calvert A


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05d: Room 2, View in program

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Submitted by Chiara Maria Petrone on
Hi Emily, very nice presentation. Have you calculated the contribution of depleted and enriched mantle and is there a time relationship and/or geographic variation in the different mantle contributions?
Hi Chiara, thank you! The short answer is yes: there mainly seems to be a geographic variation in the mantle, with the depleted mantle found in the southern part of Oregon/northern California. North of Crater Lake (into Central Oregon) there seems to be a shift to the more enriched mantle. There do not appear to be any temporal trends, except for the fact that the central Oregon volcanism is the youngest in the arc (and tapping the more-enriched mantle)

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