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Extensive reworking of Archaean crust within the Birimian terrane in Ghana as revealed by combined zircon U-Pb and Lu-Hf isotopes
Swedish Museum of Natural History, Department of Geology. University of Western Australia.ORCID iD: 0000-0002-0533-1162
2017 (English)In: Geoscience Frontiers, ISSN 1674-9871Article in journal, Letter (Refereed) In press
Abstract [en]

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 Eps-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 Eps-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 Delta-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.

Place, publisher, year, edition, pages
2017.
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-2557DOI: 10.1016/j.gsf.2017.02.006OAI: oai:DiVA.org:nrm-2557DiVA: diva2:1162296
Funder
Swedish Research Council, VR#2008-3447
Available from: 2017-12-04 Created: 2017-12-04 Last updated: 2017-12-04Bibliographically approved

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