Short wavelength heterogeneity in the Galápagos plume: Evidence from compositionally diverse basalts on Isla Santiago

Short wavelength heterogeneity in the Galápagos plume: Evidence from compositionally diverse basalts on Isla Santiago

Analyses of basalts from the Galápagos archipelago and adjacent spreading center have shown that the underlying mantle plume is isotopically heterogeneous over length scales of 10s to 100s of km. We show that the convecting mantle is also compositionally heterogeneous on smaller length scales (kms)....

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Veröffentlicht in:Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2012-09, Vol.13 (9), p.np-n/a
Hauptverfasser: Gibson, S. A., Geist, D. G., Day, J. A., Dale, C. W.
Format: Artikel
Sprache:eng
Schlagworte:
Archipelagoes
Basalt
Depletion
Enrichment
Galapagos
Geochemistry
Geophysics
Heterogeneity
Isotopic enrichment
Lithosphere
Mantle
mantle plumes
mantle processes
Melting
Plumes
Trace elements
Volcanic vents
Wavelengths
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Beschreibung
Zusammenfassung:Analyses of basalts from the Galápagos archipelago and adjacent spreading center have shown that the underlying mantle plume is isotopically heterogeneous over length scales of 10s to 100s of km. We show that the convecting mantle is also compositionally heterogeneous on smaller length scales (kms). Our evidence comes from recent small‐volume mildly alkaline and tholeiitic basalts on Isla Santiago, central Galápagos. Flows from volcanic vents
ISSN:1525-2027
1525-2027
DOI:10.1029/2012GC004244