K/Ar ages and stress pattern in the Azores: Geodynamic implications

Details K/Ar ages and stress pattern in the Azores: Geodynamic implications K/Ar ages and stress pattern in the Azores: Geodynamic implications

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..46..275f&link_type=abstract

Earth and Planetary Science Letters, Volume 46, Issue 2, p. 275-286.

Computer Science

22

Scientific paper

We have dated by the K/Ar method the oldest volcanic formations known in the Azores archipelago. The results show a development of this oceanic island system from 5.5 m.y. to the present day.
The age pattern is not compatible with a simple migration over a small fixed hot spot, but, plotting tectonic directions which control the volcanism versus age and distance to the Mid-Atlantic Ridge, a simple relationship seems to appear showing an anisotropic but fixed distribution of stress orientation at least for the last 0.7 m.y.

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