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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.

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Additional publication details

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 Conference Paper
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