Gold deposit styles and placer gold characterisation in northern and east-central Madagascar
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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.
Suggested Citation
Pitfield, P.E., Styles, M.T., Taylor, C.D., Key, R.M., Bauer, W., Ralison, A.V., 2009, Gold deposit styles and placer gold characterisation in northern and east-central Madagascar, in Smart science for exploration and mining: Proceedings of the 10th Biennial SGA Meeting, Townsville, Australia 17th-20th August 2009, Townsville, Australia, August 17-20, 2009, 3 p.
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 |