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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

Abstract

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.

Keywords

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.

Notes

Acknowledgements

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).

References

  1. Bizzarro M, Baker JA, Ulfbeck D (2003) A new digestion and chemical separation technique for rapid and highly reproducible determination of Lu/Hf and Hf isotope ratios in geological materials by MC-ICP-MS. Geostand Newslett 27:133–145Google Scholar
  2. Baker J, Peate D, Waight T, Meyzen C (2004) Pb isotopic analysis of standards and samples using a 207Pb−204Pb double spike and thallium to correct for mass bias with a double focusing MC-ICP-MS. Chem Geol 211:275–303CrossRefGoogle Scholar
  3. Blichert-Toft J, Albarède F (1997) The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system. Earth Planet Sci Lett 148:243–258CrossRefGoogle Scholar
  4. Collins WJ, Beams SD, Chappell BW, White AJR (1982) Nature and origin of A-type granites with particular reference to Southeastern Australia. Contrib Mineral Petrol 80:189–200Google Scholar
  5. Connelly JN, van Gool JAM, Mengel FC (2000) Temporal evolution of a deeply eroded orogen: the Nagssugtoqidian Orogen, West Greenland. Can J Earth Sci 37:1121–1142CrossRefGoogle Scholar
  6. Creaser RA, Price RC, Wormald RJ (1991) A-type granites revisited: assessment of a residual source model. Geology 19:163–166CrossRefGoogle Scholar
  7. Cumming GL, Richards JR (1975) Ore lead ratios in a continuously changing Earth. Earth Planet Sci Lett 28:155–171CrossRefGoogle Scholar
  8. DePaolo DJ (1981) Neodymium isotopes in the Colorado Front Range and crust-mantle evolution in the Proterozoic. Nature 291:193–196CrossRefGoogle Scholar
  9. Dunphy JM, Ludden JN (1998) Petrological and geochemical characteristics of a Paleoproterozoic magmatic arc (Narsajuaq terrane, Ungava Orogen, Canada) and comparisons to Superior Province granitoids. Precambrian Res 91:109–142CrossRefGoogle Scholar
  10. Eby GN (1992) Chemical subdivision of the A-type granitoids: petrogenetic and tectonic implication. Geology 20:641–644CrossRefGoogle Scholar
  11. Escher A, Pulvertaft TCR (1968) The Precambrian rocks of the Upernavik-Kraulshavn area (72°–74°15′N), West Greenland. Rapport Grønlands geologiske Undersøgelse 15:11–14Google Scholar
  12. Escher A, Pulvertaft TCR (1976) Rinkian mobile belt of West Greenland. In: Escher A, Watt WS (eds) Geology of Greenland. Geological Survey of Greenland, Copenhagen, pp 105–119Google Scholar
  13. Escher A, Sørensen K, Zeck HP (1976) Nagssugtoqidian mobile belt in West Greenland. In: Escher A, Watt WS (eds) Geology of Greenland. Geological Survey of Greenland, Copenhagen, pp 76–95Google Scholar
  14. Escher JC, Stecher O (1978) Precambrian geology of the Upernavik—Red Head region (72°15′−75°15′N), northern West Greenland. Rapport Grønlands geologiske Undersøgelse 90:23–26Google Scholar
  15. Foland KA, Allen JC (1991) Magma sources for Mesozoic anorogenic granites of the White Mountain magma series, New England, USA. Contrib Mineral Petrol 109:195–211CrossRefGoogle Scholar
  16. Giletti BJ (1991) Rb and Sr diffusion in alkali feldspars, with implications for cooling histories of rocks. Geochim Cosmochim Ac 55:1331–1343CrossRefGoogle Scholar
  17. Grocott J, McCaffrey K, Garde A, Thrane K, Hand M, Connelly J (2004) Regional-scale horizontal flow of the mid-lower crust: the northern Nagssugtoqidian-Rinkian collisional orogenic system, West Greenland. Channel flow, Ductile Extrusion and Exhumation of Lower-mid Crust in Continental Collision Zones. December 2004 Geological Society of LondonGoogle Scholar
  18. Grocott J, Pulvertaft TCR (1990) The Early Proterozoic Rinkian Belt of Central West Greenland. In: Lewry JF, Stauffer MR (ed) The Early Proterozoic Trans-Hudson Orogen of North America: Geological Association of Canada. Special Paper 37:443–463Google Scholar
  19. Henderson G, Pulvertaft TCR (1987) The lithostratigraphy and structure of a Lower Proterozoic dome and nappe complex. Descriptive text to 1:100 000 sheets Mârmorilik 71 V. 2 Syd, Nûgâtsiaq 71 V.2 Nord and Pangnertôq 72 V.2 Syd, 72 pp. Copenhagen: Grønlands geologiske UndersøgelseGoogle Scholar
  20. Hoffman PF (1990) Dynamics of the tectonic assembly of northeast Laurentia in geon 18 (1.9–1.8 Ga). Geoscience Canada 17:222–226Google Scholar
  21. Jackson GD, Hunt PA, Loveridge WD, Parrish RR (1990) Reconnaissance geochronology of Baffin Island, NWT. In: Radiogenic ages and isotopic studies, Report 3, Geological Survey of Canada, vol. 89–2 pp 123–148Google Scholar
  22. Jenkin GRT, Rogers G, Fallick AE, Farrow CM (1995) Rb-Sr closure temperatures in bi-minerallic rocks: a mode effect and test for different diffusion models. Chem Geol 122:227–240CrossRefGoogle Scholar
  23. Johnson TE, Gibson RL, Brown M, Buick IS, Cartwright I (2003). Partial melting of metapelitic rocks beneath the Bushveld Complex, South Africa. J Petrol 44:789–813CrossRefGoogle Scholar
  24. Kalsbeek F (1981) The northward extent of the Archaean basement of Greenland – a review of Rb-Sr whole-rock ages. Precambrian Res 14:203–219CrossRefGoogle Scholar
  25. Kalsbeek F (2001) Geochemical comparison between Archean and Proterozoic orthogneisses from the Nagssugtoqidian orogen, West Greenland. Precambrian Res 105:165–181CrossRefGoogle Scholar
  26. Kalsbeek F, Pulvertaft TCR, Nutman A (1998) Geochemistry, age and origin of metagreywackes from the Palaeoproterozoic Karrat Group, Rinkian Belt, West Greenland. Precambrian Res 91:383–399CrossRefGoogle Scholar
  27. Kerr A, Fryer BJ (1993) Nd isotope evidence for crust-mantle interaction in the generation of A-type granitoid suites in Labrador, Canada. Chem Geol 104:39–60CrossRefGoogle Scholar
  28. Loiselle MC, Wones DR (1979) Characteristics and origin of anorogenic granites. Geol Soc Am Abst Progr 11:468Google Scholar
  29. Ludwig KR (1999) Isoplot/Ex version 2.00—a geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center, Special Publication No. 2Google Scholar
  30. Paces JB, Miller JD Jr (1993) Precise U-Pb ages of Duluth Complex and related mafic intrusions, northeastern Minnesota: Geochronological insights to physical, petrogenetic, paleomagnetic, and tectonomagmatic processes associated with the 1.1 Ga midcontinent rift system. J Geophys Res 98:13997–140013Google Scholar
  31. Rudnick RL, Fountain DM (1995) Nature and composition of the continental crust: a lower crustal perspective. Rev Geophy 33:267–309CrossRefGoogle Scholar
  32. Sacks PE, Secor Jr DT (1990) Delamination in collisional orogens. Geology 18:999–1002CrossRefGoogle Scholar
  33. Scherer E, Cameron KL, Blichert-Toft J (2000) Lu-Hf garnet geochronology: Closure temperature relative to the Sm-Nd system and the effects of trace mineral inclusions. Geochim Cosmochim Acta 64: 3413–3432CrossRefGoogle Scholar
  34. Scherer E, Münker C, Mezger K (2001) Calibration of the Lutetium-Hafnium Clock. Science 293:683–687PubMedGoogle Scholar
  35. Scott DJ (1999) U-Pb geochronology of the eastern Hall Peninsula, southern Baffin Island, Canada: a northern link between the Archean of West Greenland and the Paleoproterozoic Torngat Orogen of northern Labrador. Precambrian Res 93:5–26CrossRefGoogle Scholar
  36. Spear FS, Kohn MJ, Cheney JT (1999) P-T paths from anatectic pelites. Contrib Mineral Petrol 134:17–32CrossRefGoogle Scholar
  37. Stern RA (1998) High-resolution SIMS determination of radiogenic trace-isotope ratios in minerals. In: Cabri LJ, Vaughan DJ (ed) Modern approaches to ore and environmental mineralogy. Mineralogical Association of Canada Short Course Series 27:241–268Google Scholar
  38. Sun SS, McDonough WF (1989) Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes. In: Saunders AD, Norry MJ (eds) Magmatism in the Ocean Basins. Geological Society Special Publication No 42 Geological Society, London pp 313–345Google Scholar
  39. Thöni M (2002) Sm-Nd isotope systematics in garnet from different lithologies (Eastern Alps): age results, and an evaluation of potential problems for garnet Sm-Nd chronology. Chem Geol 185:255–281CrossRefGoogle Scholar
  40. Thrane K, Connelly JN, Garde AA, Grocott J, Krawiec AW (2003) Linking the Palaeoproterozoic Rinkian and Nagssugtoqidian belts of central West Greenland: implications of new U-Pb and Pb-Pb zircon ages. Geophysical Research Abstracts 5:09275Google Scholar
  41. Turner SP, Foden JD, Morrison RS (1992) Derivation of some A-type magmas by fractionation of basaltic magma: An example from the Padthaway Ridge, South Australia. Lithos 28:151–179CrossRefGoogle Scholar
  42. van Gool JAM, Connelly JN, Marker M, Mengel FC (2002) The Nagssugtoqidian Orogen of West Greenland: tectonic evolution and regional correlations from a West Greenland perspective. Can J Earth Sci 39:665–686CrossRefGoogle Scholar
  43. Van Kranendonk MJ, St-Onge MR, Henderson JR (1993) Paleoproterozoic tectonic assembly of Northeast Laurentia through multiple indications. Precambrian Res 63:325–347CrossRefGoogle Scholar
  44. Vervoort JD, Blichert-Toft J (1999) Evolution of the depleted mantle: Hf isotope evidence from juvenile rocks through time. Geochim Cosmochim Acta 63:533–556CrossRefGoogle Scholar
  45. Whalen JB, Currie KL, Chappell BW (1987) A-type granites: geochemical characteristics, discrimination and petrogenesis. Contrib Mineral Petrol 95:407–419CrossRefGoogle Scholar
  46. Williams IS (1998) U-Th-Pb geochronology by ion microprobe. In: McKibben MA, Shanks WCP III, Ridley WI (eds) Applications of microanalytical techniques to understanding mineralizing processes. Society of economic geology, Short Course vol 7 pp 1–39Google Scholar

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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