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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
Naturhistoriska riksmuseet, Enheten för geovetenskap. University of Western Australia.ORCID-id: 0000-0002-0533-1162
Lund University.
2018 (engelsk)Inngår i: Geoscience Frontiers, Vol. 9, s. 173-189Artikkel i tidsskrift (Fagfellevurdert) Published
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.

sted, utgiver, år, opplag, sider
2018. Vol. 9, s. 173-189
Emneord [en]
Birimian Baoulé Mossi Archaean Crustal growth Zircon
HSV kategori
Forskningsprogram
Den föränderliga jorden
Identifikatorer
URN: urn:nbn:se:nrm:diva-3208DOI: 10.1016/j.gsf.2017.02.006OAI: oai:DiVA.org:nrm-3208DiVA, id: diva2:1273842
Forskningsfinansiär
Swedish Research Council, VR#2008-3447 and VR#2012-4531Tilgjengelig fra: 2018-12-22 Laget: 2018-12-22 Sist oppdatert: 2025-09-12bibliografisk kontrollert

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Forlagets fullteksthttp://dx.doi.org/10.1016/j.gsf.2017.02.006

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