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picrites

Earth and Environmental Science Transactions of The Royal Society of Edinburgh (1)

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Alkaline basaltic volcanism in the Tertiary of central East Greenland—the Trekantnunatakker
P. E. Brown, I. B. Evans, S. M. Becker
Journal:

Transactions of the Royal Society of Edinburgh: Earth Sciences / Volume 90 / Issue 2 / 1999

Published online by Cambridge University Press:

03 November 2011, pp. 165-172

Print publication:

1999
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The Trekantnunatakker rise from the inland ice NW of the head of Kangerlussuaq fjord on the Blosseville Coast of central East Greenland. In these nunataks the main sequence of Tertiary flood basalts is overlain by picritic and ankaramitic lavas. These mildly alkaline lavas have lower 143Nd/144Nd and higher 87Sr/86Sr than the tholeiitic flood basalts. Their isotopic and incompatible element characteristics are similar to those of moderately enriched ocean island basalts, and comparable to the alkaline lavas of the nearby Prinsen af Wales Bjerge. The Trekantnunatakker lavas were the result of small-volume deep melting and it is concluded that an enriched OIB-type source was present as a component of the East Greenland plume.