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The Prinsen af Wales Bjerge Formation Lavas, East Greenland: the Transition from Tholeiitic to Alkalic Magmatism during Palaeogene Continental Break-up |
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| Authors: | PEATE, D. W. BAKER, J. A. BLICHERT-TOFT, J. HILTON, D. R. STOREY, M. KENT, A. J. R. BROOKS, C. K. HANSEN, H. PEDERSEN, A. K. DUNCAN, R. A. |
| Affiliation: | 1DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK 2LABORATOIRE DES SCIENCES DE LA TERRE, ÉCOLE NORMALE SUPÉRIEURE DE LYON, 46 ALLÉE D’ITALIE, 69364 LYON CEDEX 7, FRANCE 3GEOSCIENCES RESEARCH DIVISION, SCRIPPS INSTITUTION OF OCEANOGRAPHY, LA JOLLA, CA 92093-0220, USA 4GEOLOGICAL INSTITUTE, UNIVERSITY OF COPENHAGEN, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK 5GEOLOGICAL MUSEUM, ØSTER VOLDGADE 5, DK-1350 COPENHAGEN K, DENMARK 6COLLEGE OF OCEANIC AND ATMOSPHERIC SCIENCES, OREGON STATE UNIVERSITY, CORVALLIS, OR 97331, USA |
| Abstract: | We present elemental and isotopic (SrNdPbHfOsHe)data on primitive alkalic lavas from the Prinsen af Wales Bjerge,East Greenland. Stratigraphical, compositional and 40Ar39Ardata indicate that this inland alkalic activity was contemporaneouswith the upper parts of the main tholeiitic plateau basaltsand also post-dated them. The alkalic rocks show a marked crustalinfluence, indicating establishment of new magmatic plumbingsystems distinct from the long-lived coastal systems that fedthe relatively uncontaminated plateau basalts. The least contaminatedlavas have high 3He/4He isotope ratios (R/RA 12·418·5),sub-chondritic 187Os/188Osi (0·1200·126),low |
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