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Birimian crustal growth in the West African Craton: U-Pb, O and Lu-Hf isotope constraints from detrital zircon in major rivers
Naturhistoriska riksmuseet, Enheten för geovetenskap. University of Western Australia.ORCID-id: 0000-0002-0533-1162
Naturhistoriska riksmuseet, Enheten för geovetenskap. Lund University.
Vise andre og tillknytning
2018 (engelsk)Inngår i: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, nr 479, s. 259-271Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Combined U-Pb, O and Lu-Hf isotope analyses of detrital zircon grains from five major rivers in Ghana are used to investigate the growth and evolution of the Birimian terrane of the West African Craton. The majority of the analysed zircon yields supra-chondritic εHf values, suggesting derivation from primarily juvenile host magmas. Zircon grains from the Birim River in southwestern Ghana deviate from the generally juvenile trend, where the sub-chondritic εHf but mantle-like δ18O of the 2.15 Ga population suggest reworking of ancient, but unweathered, meta-igneous crust. Hf-O isotope data from detrital zircons of the remaining rivers are consistent with sequential crust generation between ca. 2.2 and 2.1 Ga. Oxygen isotope data suggest that the contribution from Archaean sedimentary material to felsic magmas was below 30%, and in most cases below 10%. Zircon with strongly positive εHf values and elevated δ18O indicate rapid reworking of juvenile crust within southern Ghana. An increase towards heavier oxygen isotope signatures over time suggests a maturing arc system with rapid recycling of juvenile supracrustal material during the evolution of the Birimian terrane.

sted, utgiver, år, opplag, sider
2018. nr 479, s. 259-271
Emneord [en]
West African Craton Baoulé Mossi Detrital zircon U-Pb Lu-Hf Oxygen
HSV kategori
Forskningsprogram
Den föränderliga jorden
Identifikatorer
URN: urn:nbn:se:nrm:diva-3210DOI: 10.1016/j.chemgeo.2018.01.021OAI: oai:DiVA.org:nrm-3210DiVA, id: diva2:1273843
Forskningsfinansiär
Swedish Research Council, VR#2012-4531 to A. Scherstén and VR#2016- 00261 to A. PeterssonTilgjengelig fra: 2018-12-22 Laget: 2018-12-22 Sist oppdatert: 2019-01-14bibliografisk kontrollert

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Forlagets fullteksthttps://doi.org/10.1016/j.chemgeo.2018.01.021

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