Petrochemistry and age of the Franzfontein granitic rocks of northern South-West Africa

Details Petrochemistry and age of the Franzfontein granitic rocks of northern South-West Africa Petrochemistry and age of the Franzfontein granitic rocks of northern South-West Africa

Aug 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969gecoa..33..973c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 33, Issue 8, pp.973-986

Computer Science

Scientific paper

Chemical, spectrographic and isotopic analyses are presented for alkali and calc-alkali granitic rocks from the pre-Otavi Facies crystalline basement of northern South-West Africa. On the basis of new Rb-Sr whole rock isotopic studies and a previously published zircon age, the most reliable estimate for the age of emplacement of the Franzfontein granitic rocks is 1650 ± 80 m . y . Three discordant whole rock "ages" of 1100-1300 m.y. are believed to reflect the post-crystallisation migration of Sr resulting from sub-aerial weathering. The chemical compositions of this suite are compared with those of a wide variety of African pre-Silurian acidic igneous rocks and with the estimated composition of granites of the earth's crust.

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