Original paper

Time, episodicity and the generation of world class ore deposits

Robb, Laurence

Global Tectonics and Metallogeny Volume 8 Number 1-4 (2003), p. 213 - 214

published: Jan 1, 2003

BibTeX file

ArtNo. ESP136000800043, Price: 19.00 €

Download preview PDF Buy as PDF

Abstract

The generation of giant ore deposits is a fortuitous combination of geological events not often repeated in Earth history. Ore formation commonly involves the superimposition of geologic processes and these might include (in no particular order) anatexis, magma emplacement, sedimentation, diagenesis and burial, formation of a hydrothermal fluid phase and its subsequent migration, compressive and/or extensional tectonic stress regimes, exhumation of putative host rocks and preservation of the ore body. Examples of world class deposits in southern and central Africa suggest that ore formation is invariably linked to more than one of these processes, the imposition of which identifies discrete episodes in ore generation (i.e. the paragenetic sequence), and the duration of which is long-lived even on the scale of geological time.

Keywords

ore depositsanatexismagma emplacementhydrothermalafrica