Tectonic control of ocean island basalt sources on São Miguel island, Azores?

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Haase K, Beier C
Zeitschrift: Geophysical Research Letters
Verlag: American Geophysical Union (AGU)
Jahr der Veröffentlichung: 2003
Band: 30
ISSN: 0094-8276


Abstract


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.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Beier, Christoph PD Dr.
Lehrstuhl für Endogene Geodynamik
Haase, Karsten Prof. Dr.
Lehrstuhl für Endogene Geodynamik


Zitierweisen

APA:
Haase, K., & Beier, C. (2003). Tectonic control of ocean island basalt sources on São Miguel island, Azores? Geophysical Research Letters, 30. https://dx.doi.org/10.1029/2003GL017500

MLA:
Haase, Karsten, and Christoph Beier. "Tectonic control of ocean island basalt sources on São Miguel island, Azores?" Geophysical Research Letters 30 (2003).

BibTeX: 

Zuletzt aktualisiert 2018-08-07 um 02:23