Geochronology of Precambrian basement rocks from Ibadan, Southwestern Nigeria

Details Geochronology of Precambrian basement rocks from Ibadan, Southwestern Nigeria Geochronology of Precambrian basement rocks from Ibadan, Southwestern Nigeria

Dec 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970e%26psl..10...29k&link_type=abstract

Earth and Planetary Science Letters, vol. 10, Issue 1, pp.29-38

Physics

3

Scientific paper

A Sb-Sr isochron age of 2205 ± 70 my given by a granite gneiss demonstrates that Eburnean granitic and older metamorphic rocks are widespread in southwestern Nigeria. In the Ibadan area the reactivation due to the Pan-African thermo-tectonic event (600 ± 150 my) appears to have been largely thermal in character. Its termination some 480 my ago is dated by K-Ar ages on separated minerals and on one member of an unmetamorphosed basalt dyke suite. The host rocks to the Eburnean granite gneiss may have crystallized during the 2800 ± 200 my Liberian cycle.

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