The palaeomagnetic record of the Santiago volcanics (Republic of Cape Verde); multiphase magnetization and age consideration

Details The palaeomagnetic record of the Santiago volcanics (Republic of Cape Verde); multiphase magnetization and age consideration The palaeomagnetic record of the Santiago volcanics (Republic of Cape Verde); multiphase magnetization and age consideration

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pepi...64..290a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 64, Issue 2-4, p. 290-302.

Physics

3

Scientific paper

The palaeomagnetism of the older volcanic complex of Santiago constitutes a multicomponent structure, and magnetomineralogical evidence suggests that the various remanence vectors are carried principally by titanomaghaemites. When viewed in the context of the African palaeomagnetic reference frame the predominant magnetization is consistent with an Upper Tertiary age, but two older magnetizations of inferred Lower Tertiary age are also in evidence. The demonstrable secondary nature of all three palaeomagnetic axes (each of them represented by both polarities) makes it likely that the actual emplacement of the older complex is of pre-Tertiary age, being probably an integral component of the pronounced tectonomagmatic uplift phase that affected the entire northwest African margin in Upper Cretaceous time. The older complex of Santiago can probably be correlated with the igneous core of the neighbouring island of Maio, which apparently formed during Turonian time (~ 90 Ma ago). Some younger lavas of Upper Miocene age (the Flamengos Formation) show a much simpler palaeomagnetic history than rocks of the older complex, yielding only the Upper Tertiary palaeomagnetic field axis.

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