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Rifting of the oceanic Azores Plateau with episodic volcanic activity.
B Storch1, K M Haase2, R H W Romer2
1GeoZentrum Nordbayern, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Schlossgarten 5, 91054, Erlangen, Germany. Bettina.storch@fau.de.
Scientific Reports
|November 13, 2020
Summary
The Azores Plateau
Area of Science:
- Geology
- Oceanography
- Volcanology
Background:
- The Azores Plateau, an oceanic plateau in the Atlantic, exhibits unique volcanic activity.
- The Terceira Rift is a key tectonic feature influencing the region's geology.
Purpose of the Study:
- To investigate the composition and age of lava sequences in the Hirondelle Basin.
- To understand the rifting processes and mantle source evolution along the Terceira Rift.
Main Methods:
- Stratigraphic analysis of a 1.2 km vertical lava profile.
- Geochronological dating of volcanic units.
- Isotopic analysis (Nd, Hf, Pb) of lava samples.
Main Results:
- Two distinct basanitic to alkali basaltic lava units were identified, differing in composition and eruption age.
- The Hirondelle Basin opened approximately 1.56 Ma, followed by alkaline volcanism.
- Mantle sources show a shift towards less radiogenic isotopic compositions, suggesting lithospheric thinning.
Conclusions:
- Rifting of oceanic lithosphere in the Azores region is characterized by alternating magmatic and tectonic phases.
- Episodic volcanic activity along the Terceira Rift is linked to mantle source changes and lithospheric processes.
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