Geodynamics of Neoproterozoic Ni deposits in eastern Africa

What is it about?

A brief description is given of four recently explored Ni(-Cu) sulphide deposits located in Zambia, Malawi, Mozambique and Tanzania. Their field relations or direct isotopic dating suggest they are all Neoproterozoic in age. Their field relations and their mafic-ultramafic host rock types suggest they are associated with rifting or extensional settings at the southern margin of the Congo craton. The two most eastern deposits may have evolved on island arcs off this margin.

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Why is it important?

The geodynamic setting of the four deposits associated with extension of the southern Congo craton, or with island arcs, would imply a limited potential for the discovery of much larger giant deposits. Nevertheless, small to moderate resources at adequate grades have been demonstrated, and these might become economic to extract given favourable circumstances.

Perspectives