40Ar/39Ar ages for the alkaline volcanism and the basement of Gorringe Bank, North Atlantic ocean

Details 40Ar/39Ar ages for the alkaline volcanism and the basement of Gorringe Bank, North Atlantic ocean 40Ar/39Ar ages for the alkaline volcanism and the basement of Gorringe Bank, North Atlantic ocean

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..57..211f&link_type=abstract

Earth and Planetary Science Letters, Volume 57, Issue 1, p. 211-226.

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Scientific paper

Gorringe Bank is situated on the Europe-Africa plate boundary at the eastern end of the Azores-Gibraltar fracture zone. It has two summits, Gettysburg Bank to the Southwest and Ormonde Bank to the northeast.
We applied the 40Ar/39Ar stepwise heating method to date six samples of the alkaline volcanic rocks, two gabbros from the Ormonde Bank and a dolerite from the Gettysburg Bank. The results that the alkaline volcanism lasted probably for less than 6 Ma(66-60 Ma).
Although the nature of this volcanism precludes any subduction feature during its setting, the alkaline volcanism of Ormonde is probably linked to Upper Cretaceous/Eocene compressive tectonic events.
The basement rocks of Gorringe Bank reveal distrubed 40Ar/39Ar age spectra. One plagioclase and one biotite from a gabbro give evidence for a thermic event whose age is tentatively estimated at about 75 Ma, and related to a variation in the direction of the relative movement between Europe and Africa. The more probable age given by a plagioclase of another gabbro and by a dolerite (110 Ma) corresponds to tilting northeastward of the Gorringe massif.

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