Alkaline basaltic volcanism in the Tertiary of central East Greenland; the Trekantnunatakker

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Authors:Brown, P. E.; Evans, I. B.; Becker, S. M.
Author Affiliations:Primary:
University of Saint Andrews, Department of Geology, Saint Andrews, United Kingdom
Other:
University of Dundee, United Kingdom
Volume Title:Transactions of the Royal Society of Edinburgh: Earth Sciences
Source:Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.90(Part 2), p.165-172. Publisher: Royal Society of Edinburgh, Edinburgh, United Kingdom. ISSN: 0263-5933
Publication Date:2000
Note:In English. 33 refs.; illus., incl. 3 tables, geol. sketch map
Summary: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.
Sections:Petrology
Subsections:Igneous petrology
Subjects:Absolute age; Alkali basalts; Alkalic composition; Alkaline earth metals; Ankaramite; Basalts; Basanite; Cenozoic; Chemical composition; Enrichment; Eocene; Flood basalts; Geochemistry; Glacial features; Igneous rocks; Isotope ratios; Isotopes; K/Ar; Lava flows; Major elements; Metals; Nd-144/Nd-143; Neodymium; Nunataks; Paleocene; Paleogene; Picrite; Rare earths; Source rocks; Spectra; Sr-87/Sr-86; Stable isotopes; Strontium; Tertiary; Tholeiitic basalt; Tholeiitic composition; Trace elements; Ultramafic composition; Volcanic rocks; Volcanism; Whole rock; X-ray fluorescence spectra; Arctic region; East Greenland; Greenland; Kangerlussuaq; Blosseville Coast; Central East Greenland; Prinses af Wales Bjerge; Trekantnunatakker
Coordinates:N660000 N690000 W0314500 W0323000
Abstract Numbers:00M/3209
Record ID:2000042027
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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