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Abstract
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 (<0.5wt% Ag) is related to recycling of paleoplacers and erosion of post-Gondwana planation surfaces and indicates that some mesothermal gold systems were already partially to wholly removed by erosion by the PermoTriassic.
Study Area
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Gold deposit styles and placer gold characterisation in northern and east-central Madagascar |
| Year Published | 2009 |
| Language | English |
| Publisher | James Cook University School of Earth & Environmental Studies. Economic Geology Research Unit |
| Contributing office(s) | Central Mineral and Environmental Resources Science Center |
| Description | 3 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Smart science for exploration and mining: Proceedings of the 10th Biennial SGA Meeting, Townsville, Australia 17th-20th August 2009 |
| Conference Title | 10th Biennial SGA Meeting: Smart Science for Exploration and Mining |
| Conference Location | Townsville, Australia |
| Conference Date | August 17-20, 2009 |
| Country | Madagascar |
| Other Geospatial | North and east-central Madagascar |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |