Gold deposit styles and placer gold characterisation in northern and east-central Madagascar
August 20, 2009
Microchemical characterisation of bedrock and placer gold grains from six gold districts within the Archaean domains and intervening Neoproterozoic Anaboriana-Manampotsy belt of northern and east-central Madagascar show few opaque inclusions (e.g pyrrhotite, Bi tellurides) but wide range of Ag contents (40wt%). Some districts exhibit multiple source populations of grains. The ‘greenstone belt’ terranes have an orogenic gold signature locally with an intrusion-related to epithermal overprint. Proterozoic metasediments with felsic to ultramafic bodies yield dominantly intrusion-related gold. A high proportion of secondary gold (
Citation Information
| Publication Year | 2009 |
|---|---|
| Title | Gold deposit styles and placer gold characterisation in northern and east-central Madagascar |
| Authors | Peter E. J Pitfield, Michael T. Styles, Cliff D. Taylor, Roger M. Key, Wilfried Bauer, A Vonimanitra Ralison |
| Publication Type | Conference Paper |
| Publication Subtype | Conference Paper |
| Index ID | 70156818 |
| Record Source | USGS Publications Warehouse |
| USGS Organization | Central Mineral and Environmental Resources Science Center |