U-PB and HF isotope constraints for emplacement of the nkandla granite, Southeastern kaapvaal craton, South Africa

N. Hicks, M. Elburg, T. Andersen

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We report zircon ages and Hf isotopic compositions for the Nkandla Granite of the Ilangwe Granitoid/Gneiss Suite exposed to the southeast of Nkandla in northern KwaZulu-Natal, South Africa. The Ilangwe Granitoid/Gneiss Suite is intnisive into the Ilangwe Greenstone Belt along the southeastern margin of the Kaapvaal Craton. Zircons obtained from the Nkandla Granite yielded an upper intercept age of 3254 ± 8 Ma, interpreted to be the age of intrusion, with evidence of lead loss events at 3086 ± 17 Ma and in the Phanerozoic. The -3.25 Ga age is consistent with late Palaeoarchaean ages obtained from similar granitoid units throughout the southeastern Kaapvaal Craton. The intnisive relationship with the adjacent Ilangwe Greenstone Belt provides a minimum age for the, as yet undated, greenstone succession. Initial hafnium isotopic compositions range from εHf= -2 to +7, indicating a role for both mantle input and crustal reworking.

Original languageEnglish
Pages (from-to)119-128
Number of pages10
JournalSouth African Journal of Geology
Issue number2
Publication statusPublished - Jun 2015
Externally publishedYes


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