Zincian Högbomite as an Exploration Guide to Metamorphosed Massive Sulphide Deposits

Paul G. Spry and Erich U. Petersen
253 Science I, Department of Geological and Atmospheric Sciences, Iowa State University, Ames, Iowa 50011, USA
717 Browning Building, Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA

Abstract: Zincian högbomite (ZnO 3.5–10.5wt.%) occurs as an accessory phase in garnet quartzite that is intimately associated with the Broken Hill and Black Mountain Cu-Pb-Zn-Ag deposits, Aggeneys, South Africa. Högbomite coexists with a number of minerals including quartz, gahnite, sillimanite, sphalerite, pyrrhotine, pyrite, magnetite, and ilmenite, suggesting that högbomite may have formed by sulphidation and oxidation reactions. Such reactions may account for the high Zn content of högbomite. Where associated with metamorphosed massive sulphide deposits högbomite is enriched in Zn relative to that found in ultramafics, Fe-Ti deposits, Fe ores, aluminous metasediments, and skarns. This enrichment in högbomite constitutes a potential exploration guide for metamorphosed massive sulphide deposits.

Keywords: zincian högbomite • sulphidation-oxidation reactions • Aggeneys • South Africa • massive sulphides • exploration guide

Mineralogical Magazine; April 1989 v. 53; no. 370; p. 263-269; DOI: 10.1180/minmag.1989.053.370.15
© 1989, The Mineralogical Society
Mineralogical Society (www.minersoc.org)