Gold in the Early Paleoproterozoic Birimian Shield, West ... - ADIMB

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Protracting accretion/gold districtsTectonic cyclicity createdelaborate protractingstructural network2060 Ma2150 Ma1500 km of recycled crust addedfrom 2195 Ma (SE Ghana) to2067 Ma (W Mali)200 km
Main gold settings• Mesothermal orogenic gold along regionalstructures affecting mainly back arc belt-basinshear zones (Obuasi-Prestea, Akyem, Bibiani,Ahafo, Konkera);• Volcanic and shallow plutonic felsic bodies alongactive strike-slip regional faults related to pullapartbasins (Angovia);• Early hydrothermal activity and/or shallowplutonism along normal faults (Siguiri basin);• Paleoplacer conglomerates in a possible orogenicforeland basin (Tarkwa).
Page 5: GEOLOGYBRGM 2005Siguiri Basin3.3-2.
Page 9 and 10: Northern Districts (~100 Moz)Northe
Page 11 and 12: ObuasiSouthern Ashanti BeltBogosoPr
Page 13 and 14: BUVTDD013:27.5 m @ 3.7g/tSBuesichem
Page 15 and 16: • Meta-sediments(carbonaceous sha
Page 17 and 18: Imbricate Thrust systemWest50 m Mai
Page 19 and 20: Common themes‣ All mesothermal or
Page 21 and 22: frequencyU-Pb zircons Eastern Guian
Page 23 and 24: TransAmazonian Tectonic FrameworkFr
Page 25 and 26: Rosebel GeologicalCross-sectionBrid
Page 27 and 28: Early Paleoproterozoic orogens ofAf

Gold in the Early Paleoproterozoic Birimian Shield, West ... - ADIMB

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