Extensive reworking of Archaean crust within the Birimian terrane in Ghana as revealed by combined zircon U-Pb and Lu-Hf isotopes

Research output: Contribution to journalArticle

Abstract

Located in the southeastern parts of the Baoulé Mossi domain of the West African Craton, the Birimian terrane in Ghana is known to consist of predominantly juvenile crust emplaced during the Eburnean orogeny. Here we present novel coupled zircon U-Pb and Lu-Hf isotope data from nine Birimian granitoids intruding different domains from northwestern, western and southeastern Ghana. Sub-chondritic e(open) Hf-values indicating reworking of Archaean crust are recorded in zircon from both northwestern and southeastern Ghana. As a conservative estimate 71% of all analysed zircon grains spanning in age from 2220 Ma to 2130 Ma require contribution from a reworked Archaean source, contradicting the common belief that the Birimian terrane consist of predominantly juvenile crust. A minimum e(open) Hf-value of -10.5 at 2139 Ma suggests a Palaeoarchaean to late Mseoarchaean component as the contributing ancient source. Combined with previously reported heavy zircon δ 18O signatures from Birimian river zircon in Ghana, our new data suggests reworking of Archaean aged sediments during subduction initiated crustal growth in the vicinity of one, or possibly in between two Archaean aged cratons.

Details

Authors
Organisations
External organisations
  • University of Western Australia, Crawley
  • Swedish Museum of Natural History
  • Goethe University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Geochemistry

Keywords

  • Archaean, Baoulé Mossi, Birimian, Crustal growth, Zircon
Original languageEnglish
Pages (from-to)173-189
JournalGeoscience Frontiers
Volume9
Issue number1
Publication statusPublished - 2018 Jan
Publication categoryResearch
Peer-reviewedYes