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Direct dating of gold by radiogenic helium: Testing the method on gold from Diamantina, Minas Gerais, Brazil
- Source :
- Geology. 41:163-166
- Publication Year :
- 2013
- Publisher :
- Geological Society of America, 2013.
-
Abstract
- New analytical developments have made radiogenic helium ( 4 He) applicable to archeological gold artifacts for age determinations. Here we report the application of the U/Th– 4 He method to the direct dating of gold from the historically important gold deposit in Diamantina, Minas Gerais, Brazil. The U/Th– 4 He age of 515 ± 55 Ma for the Diamantina gold is corroborated by a new U/Pb age of 524 ± 16 Ma for rutile recovered from auriferous pockets. These ages tie the Diamantina gold mineralization to the Brasiliano orogenic event, in the context of the Gondwana amalgamation. Our results indicate that U/Th– 4 He dating of gold is possible, opening new perspectives for the dating of gold deposits without assuming contemporaneity between gold and datable hydrothermal minerals.
Details
- ISSN :
- 19432682 and 00917613
- Volume :
- 41
- Database :
- OpenAIRE
- Journal :
- Geology
- Accession number :
- edsair.doi...........8954b9a131b877de9186be4a5616e802