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Book Chapter

Polyorogenic history of the East Greenland Caledonides

By
Feiko Kalsbeek
Feiko Kalsbeek
1
Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
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Kristine Thrane
Kristine Thrane
1
Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
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A.K. Higgins
A.K. Higgins
1
Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
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Hans F. Jepsen
Hans F. Jepsen
1
Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
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A. Graham Leslie
A. Graham Leslie
2
British Geological Survey, Murchison House, Edinburgh, EH9 3LA, UK
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Allen P. Nutman
Allen P. Nutman
3
Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia
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Robert Frei
Robert Frei
4
Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen, Denmark
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Published:
January 01, 2008

The Caledonian orogen of East Greenland contains remnants of Archean, Paleoproterozoic, late Mesoproterozoic, and early Neoproterozoic rocks that occur within far-traveled thrust sheets, and bear witness to a complex polyorogenic history of the region prior to Caledonian orogenesis. Archean and Paleoproterozoic complexes consist mainly of granitoid orthogneisses. A succession of Paleoproterozoic tholeiitic metabasalts is present in some of the foreland windows. A major unit of late Meso-proterozoic metasedimentary rocks (Krummedal supracrustal sequence) contains early Neoproterozoic (ca. 950 Ma) as well as Caledonian granites. There is evidence for Archean (ca. 2800–2600 Ma), Paleoproterozoic (2000–1750 Ma), and late Grenvillian (ca. 950 Ma) deformation and metamorphism, but Caledonian overprinting complicates the study of these events. This paper presents a broad overview of the various rock units with structural, geochemical, and geochronologic data. The Paleoproterozoic metabasaltic rocks from the foreland windows are described in more detail.

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Contents

GSA Memoirs

The Greenland Caledonides: Evolution of the Northeast Margin of Laurentia

A.K. Higgins
A.K. Higgins
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Jane A. Gilotti
Jane A. Gilotti
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M. Paul Smith
M. Paul Smith
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Geological Society of America
Volume
202
ISBN print:
9780813712024
Publication date:
January 01, 2008

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