Contributions to Mineralogy and Petrology

, Volume 149, Issue 5, pp 541–555 | Cite as

Age, petrogenesis and metamorphism of the syn-collisional Prøven Igneous Complex, West Greenland

  • K. ThraneEmail author
  • J. Baker
  • J. Connelly
  • A. Nutman
Original Paper


The Paleoproterozoic Prøven Igneous Complex (PIC) in West Greenland extends from ca. 72°15′ to 73°10′N, approximately 500 km north of the subduction-related intrusive complex in the core of the +1100 km wide, asymmetric collisional Nagssugtoqidian-Rinkian Orogen. A new U-Pb SHRIMP age for the PIC of 1869±9 Ma indicates that it intruded synchronously with the main collisional phase of the orogen into the passive margin side of the collision. Sm-Nd and Lu-Hf isotopic and A-type geochemical signatures are compatible with its derivation from melted Archean lower crustal material contaminated to varying degrees by pelitic sedimentary rocks of the Karrat Group. The timing, petrogenesis and position of the PIC within the orogen support a model of collisionally induced delamination of the mantle lithosphere following initial collision. Upwelling asthenospheric mantle replacing the partially or completely detached mantle lithosphere caused widespread partial melting of lower crust that resulted in the areally extensive (~ 250,000 km2) Cumberland-Prøven intrusive complexes of Baffin Island and West Greenland. Emplacement of the PIC at 1.87 Ga caused a high-temperature low- to medium-pressure metamorphic aureole that contrasts the regional, overprinting higher-pressure amphibolite facies metamorphism. The consequent high-temperature garnet-orthopyroxene-biotite-bearing assemblages occurring within the margin of the intrusion in the aureole are attributed to the intrusion event. Garnet-controlled Sm-Nd and Lu-Hf ages of 1.82–1.80 Ga require efficient diffusion of these elements during orogenic reheating at this time. This age range overlaps the post-collisional, north–south shortening in the Nagssugtoqidian Orogen to the south and serves to confirm the recently proposed genetic link between these two orogens. These new data infer that garnet-controlled isochrons based on the Lu-Hf and Sm-Nd systems cannot date high-grade events in slowly cooled or significantly reheated terrains in rocks possessing other phases that close at low temperatures.


Orogen Lower Crust Incompatible Element Closure Temperature Inductively Couple Plasma Mass Spectrometer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Our working group also includes Adam Garde, John Grocott, Ken McCaffrey and Martin Hand—they are thanked for numerous discussions. Tod Waight assisted in the data collection at the MC-ICPMS facility at the Danish Lithosphere Centre and Toby Leeper collected the Rb-Sr data at the TIMS facility at the University of Copenhagen. Peter Venslev, Maria Jankowski and Birthe Møller are thanked for technical support. The Carlsberg Foundation and the Geological Survey of Denmark and Greenland funded the fieldwork. The Danish Lithosphere Centre received its funding from the Danish National Research Foundation. This work was also sponsored by the National Science Foundation (EAR-0337594).


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • K. Thrane
    • 1
    • 2
    Email author
  • J. Baker
    • 1
    • 3
  • J. Connelly
    • 1
    • 4
  • A. Nutman
    • 5
  1. 1.Danish Lithosphere CentreCopenhagenDenmark
  2. 2.Geological Institute, University of CopenhagenCopenhagenDenmark
  3. 3.School of Earth Sciences, Victoria University of WellingtonWellingtonNew Zealand
  4. 4.Department of Geological SciencesThe University of Texas at AustinAustinUSA
  5. 5.Research School of Earth Sciences, Australian National UniversityCanberraAustralia

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