Uranium and thorium in paleozoic basalts of Nova Scotia (Canada)

Details Uranium and thorium in paleozoic basalts of Nova Scotia (Canada) Uranium and thorium in paleozoic basalts of Nova Scotia (Canada)

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983bvol...46..125d&link_type=abstract

Bulletin Volcanologique, Volume 46, Issue 2, pp.125-133

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Scientific paper

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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