Uranium and thorium in paleozoic basalts of Nova Scotia (Canada) |
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| Authors: | C Dupuy J Dostal |
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| Institution: | 1. Centre Geologique et Geophysique, U.S.T.L., 34060, Montpellier Cedex, France
2. Department of Geology, Saint Mary’s University, B3M 3C3, Halifax, Nova Scotia, Canada
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| Abstract: | In the Paleozoic basalts of Nova Scotia (Canada) metamorphosed to a greenschist facies grade, U and Th are closely associated with immobile elements (e.g. Zr and Nb). The coherence of these elements with K, typical of igneous rocks is, however, absent, U and Th are apparently not affected by greenschist facies metamorphism as are alkali and alkali earth elements and their variation thus reflects primary magmatic processes. It seems that during the early stages of metamorphism, U and Th were retained together with several other incompatible elements (Zr, Nb, La and Ce) in stable secondary phases or alternatively these elements may be held in primary accessory minerals such as zircon and apatite. |
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