Magnetic structure and evolution of the island of Santa Maria, Azores

Details Magnetic structure and evolution of the island of Santa Maria, Azores Magnetic structure and evolution of the island of Santa Maria, Azores

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...58..228s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 58, Issue 2-3, p. 228-238.

Physics

1

Scientific paper

A palaeomagnetic study of the major volcanic units of Santa Maria reveals dominantly reverse characteristic magnetizations with a mean direction of D = 179, I = -49 and α95 = 2.1° (85 specimens from 20 sites). Sporadically occurring normal polarity remanences are interpreted as an overprinted component imposed by the island's terminal volcanic phase (the Feteiras Formation) now primarily exposed as strongly oxydized pyroclasts. The palaeomagnetic results are combined with available radiometric age estimates and local magnetic field information, and an integrated interpretation of all the data yields the principal conclusion that the Facho and Pico Alto volcanic sequences, covering the major part of the island, were laid down at around the Miocene/Pliocene boundary (~ 5 Ma ago), i.e. immediately succeeding the local Messinian sedimentary horizon. The Feteiras Formation is assigned to the Gauss normal polarity chron (3.4-2.5 Ma) in the Upper Pliocene. It is tentatively inferred that the Feteiras event represented the final tectonomagmatic link between the Gloria Fault and the East Azores Fracture Zone. The question of a realistic lower age assessment for the older (pre-Messinian) volcanic complex remains undecided.

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