Physics
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30qde10h&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 16, pp. SDE 10-1, CiteID 1856, DOI 10.1029/2003GL017500
Physics
5
Mineralogy And Petrology: Igneous Petrology, Geochemistry: Isotopic Composition/Chemistry, Geochemistry: Composition Of The Mantle, Volcanology: Magma Migration
Scientific paper
The calderas of the two isotopically distinct volcanoes Sete Cidades and Agua de Pau on São Miguel are only 30 km apart. Sete Cidades lavas generally have 87Sr/86Sr < 0.7038 while Agua de Pau lavas have 87Sr/86Sr > 0.7040. Two overlapping rift zones exist between the two volcanoes and the lava compositions show that each rift zone is connected to the neighbouring volcano. Limited mixing between the volcanic systems implies separate ascent paths and magma sources with diameters of ~20 km. The two volcanic systems follow contrasting directions; the Sete Cidades volcanic rift strikes NW parallel to the extensional Terceira Rift, while the Agua de Pau volcanic rift zone strikes E-W. The covariation of magma sources and lithospheric tectonics may suggest that the tectonic structure of the lithosphere controls the mantle upwelling beneath São Miguel.
Beier Christoph
Haase Karsten M.
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