Author index volume 36 |
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| Authors: | Annie Michard-Vitrac Joël Lancelot Claude J Allègre Stephen Moorbath |
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| Institution: | 1. Laboratoire de Géochimie et Cosmochimie, L.A. 196, Institut de Physique du Globe, Universitéde Paris VI, 75230 Paris Cedex 05France;2. Département des Sciences de la Terre, Universitéde Paris VII, 75230 Paris Cedex 05France |
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| Abstract: | Using the single zircon technique, two areas which give some of the oldest ages on earth have been investigated, namely the Minnesota River Valley and West Greenland.The results on single zircons from the Minnesota River Valley and from the Amîtsoq gneisses (West Greenland) do not differ significantly from the results of Farhat (1975) and Baadsgaard (1973) at about 3.3 and 3.65 b.y., respectively.The U-Pb analyses of single zircons from acid boulders from the conglomerate unit at Isua (West Greenland) yield the oldest age so far reported for a terrestrial rock, namely 3.824?0.009+0.012 b.y. |
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