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Haase & Beier 2003
Haase, K.M. and Beier, C. (2003). Tectonic control of ocean island basalt sources on São Miguel, Azores?. Geophysical Research Letters 30: doi: 10.1029/2003GL017500. issn: 0094-8276.

The calderas of the two isotopically distinct volcanoes Sete Cidades and Agua de Pau on S¿o Miguel are only 30 km apart. Sete Cidades lavas generally 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 S¿o Miguel.

BACKGROUND DATA FILES

Abstract

Keywords
Mineralogy and Petrology, Igneous petrology, Geochemistry, Isotopic composition/chemistry, Geochemistry, Composition of the mantle, Volcanology, Magma migration
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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