New reflections on the structure and evolution of the Makkovikian ‐ Ketilidian Orogen in Labrador and southern Greenland

Abstract

Abstract. Marine seismic reflection profiles across the Early Proterozoic Makko•-Kefilidian Orogen in the Labrador Sea region suggest that it is a doubly vergent, asymmetric orogenic belt, comparable in width to younger collisional orogens. A southeast dipping reflector package is correlated with on-land shear zones that mark the southeastern limit of exposed reworked Archcan crust and is also associated with a cryptic isotopic boundary in granites, which documents a transition from

Geochemistry and age of the Aillik Group and associated plutonic rocks, Makkovik Bay area, Labrador: implications for tectonic development of the Makkovik Province

“…These units are intruded by abundant granitoid plutons that mainly belong to the 1895-1870 Ma Island Harbour Bay Plutonic Suite, with scattered younger (ca. 1800, 1720, and 1650 Ma) plutons (Ermanovics 1993;Kerr et al 1996Kerr et al , 1997Barr et al 2001;Ketchum et al 2001). The Island Harbour Bay Plutonic Suite is interpreted to have intruded in an Andean-type setting during dextral transpression (Culshaw et al 2000; Barr et al 2001).…”

“…The intervening Aillik domain is dominated by metavolcanic and metasedimentary rocks and does not have a known equivalent in Greenland. Although recent geological studies in the Makkovik Province have led to a clearer understanding of rock units, ages, and tectonic evolution, especially in the Kaipokok and Cape Harrison domains (e.g., Kerr 1994;Kerr et al 1992Kerr et al , 1996Kerr et al , 1997Culshaw et al 2000Culshaw et al , 2002Barr et al 2001;Ketchum et al 2001Ketchum et al , 2002, the Aillik domain remains poorly understood.…”

The source of Dalradian detritus in the Buchan Block, NE Scotland: application of new tools to detrital datasets

“…The data from the Argyll Group sample (BB6) are dominated by late Mesoproterozoic (Grenville) ages with a significant contribution from Palaeoproterozoic and early Mesoproterozoic ages, probably corresponding to detritus derived from the KetilidianMakkovik, Labradorian, Torngat, New Quebec, Nagssugtoqidian and/or Pinwarian orogenic belts (Hoffman 1988;Gower 1996;Kerr et al 1997;Rivers 1997;Wasteneys et al 1997) (for palaeogeographical reconstructions see fig. 2 of Cawood et al 2003 and fig.…”

Correlation of Archaean and Palaeoproterozoic units between northeastern Canada and western Greenland: constraining the pre-collisional upper plate accretionary history of the Trans-Hudson orogen

“…1990a; Van Kranendonk et al 1993;Friend & Nutman 1994;Dawes 1997;Kerr et al 1996Kerr et al , 1997Scott 1999;Wardle et al 2000bWardle et al , 2002Garde et al 2002;van Gool et al 2002van Gool et al , 2004Thrane et al 2005;Connelly et al 2006;and references therein). The aims of this contribution are to: (1) identify and review some of the pertinent correlations; (2) integrate new tectonostratigraphic, structural, and analytical data and observations from both Canada and Greenland (in particular, new geochronological profiling of detrital zircon populations from Palaeoproterozoic supracrustal sequences); and (3) use an actualistic model to analyse and sequence the episodes of crustal accretion and growth in NE Laurentia during the Palaeoproterozoic Era.…”