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Geological Magazine; November 2005; v. 142; no. 6; p. 651-658; DOI: 10.1017/S0016756805001160
© 2005 Cambridge University Press (CUP)
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Trondhjemitic and granitic melts formed by fractional crystallization of an olivine tholeiite from Reykjanes Peninsula, Iceland

E. MARTIN*,{dagger} and O. SIGMARSSON*,{ddagger}

* Laboratoire Magmas et Volcans, OPGC – Université Blaise Pascal – CNRS, 5 rue Kessler, 63038 Clermont-Ferrand, France
{ddagger} Institute of Earth Sciences, University of Iceland, 101 Reykjavik, Iceland

{dagger} Author for correspondence: E.Martin{at}opgc.univ-bpclermont.fr

A pair of samples, from host lava and an included segregation vein from the Reykjanes Peninsula, Iceland, allows the assessment of a complete fractional crystallization of an olivine tholeiite at low pressure. The final product consists of silicic glasses with bimodal composition: trondhjemitic and more rarely granitic. Compilation of data on major element compositions of Icelandic silicic rocks reveals a clear difference from those of the segregation glasses. Fractional crystallization of basalts at low pressure is therefore not the most likely mechanism for the origin of silicic magmas in Iceland. Similar conclusions have been reached in studies on O- and Th-isotope compositions. On the other hand, the trondhjemitic compositions of the glasses in the segregation vein from Reykjanes Peninsula suggest that fractional crystallization of olivine tholeiites could have played a significant role during the formation of the very early continental crust.

Key Words: Iceland • fractional crystallization • trondhjemite • segregation vein • interstitial glass






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