The Sask Craton and Hearne Province margin: Seismic reflection studies in the western Trans-Hudson Orogen

A three-dimensional model of the regional crustal architecture of the western Trans-Hudson Orogen, based on the interpretation of 590 km of deep-sounding seismic reflection data and a comparable length of existing seismic reflection information, is presented. The seismic images identify the regional geometry of the basal detachment zone (Pelican thrust) that separates juvenile allochthonous terranes from the underlying Archean microcontinent (Sask craton). The Sask Craton is inferred to have a minimum spatial extent of over 100 000 km2 with an associated crustal root that extends for 200 km along strike. During terminal collision, complete convergence of the Rae–Hearne and Superior continental blocks was precluded by the presence of the Sask Craton, resulting in the preservation of anomalous amounts of oceanic and associated sedimentary juvenile material. Along regional tectonic strike, consistency of crustal structure across the Rae–Hearne margin – Reindeer zone boundary is established. Several phases of...

[1]  Z. Hajnal,et al.  Lithospheric structure of the Trans-Hudson Orogen from seismic refraction – wide-angle reflection studies , 2005 .

[2]  H. T. Tran,et al.  The Pelican Thrust Zone: basal detachment between the Archean Sask Craton and Paleoproterozoic Flin Flon – Glennie Complex, western Trans-Hudson Orogen, , 2005 .

[3]  D. Symons,et al.  Accretion history of the Trans-Hudson Orogen in Manitoba and Saskatchewan from paleomagnetism , 2005 .

[4]  R. Stern,et al.  Tectonic implications of new SHRIMP and TIMS U-Pb geochronology of rocks from the Sask Craton, Peter Lake Domain, and Hearne margin, Trans-Hudson Orogen, Saskatchewan , 2005 .

[5]  K. Collerson,et al.  Origin of the Archean Sask craton and its extent within the Trans-Hudson orogen: evidence from Pb and Nd isotopic compositions of basement rocks and post-orogenic intrusions , 2005 .

[6]  P. Portella,et al.  Geology and thermotectonic evolution of the western margin of the Trans-Hudson Orogen: evidence from the eastern sub-Athabasca basement, Saskatchewan , 2005 .

[7]  Z. Hajnal,et al.  Geophysical transect across a Paleoproterozoic continent-continent collision zone: The Trans-Hudson Orogen , 2005 .

[8]  H. T. Tran,et al.  Nd isotope and geochemical constraints on the depositional setting of Paleoproterozoic metasedimentary rocks along the margin of the Archean Hearne craton, Saskatchewan, Canada , 2003 .

[9]  A. Tryggvason,et al.  The crustal architecture of the Southern and Middle Urals from the URSEIS, ESRU, and Alapaev reflection seismic surveys , 2013 .

[10]  W. Bleeker,et al.  Suture-zone geometry along an irregular Paleoproterozoic margin: The Superior boundary zone, Manitoba, Canada , 2002 .

[11]  M. Hamilton,et al.  Archean rocks in the southern Rottenstone Domain: significance for the evolution of the Trans-Hudson Orogen , 2001 .

[12]  M. Leech.  Arrested orogenic development: eclogitization, delamination, and tectonic collapse , 2001 .

[13]  C. Beaumont,et al.  Collision tectonics in the Swiss Alps: Insight from geodynamic modeling , 2000 .

[14]  Z. Hajnal,et al.  Crustal suture preserved in the Paleoproterozoic Trans-Hudson orogen, Canada , 2000 .

[15]  R. Creaser,et al.  Discovery of pre-3.5 Ga exotic crust at the northwestern Superior Province margin, Manitoba , 2000 .

[16]  S. Lucas,et al.  Introduction to Special Issue 2 on the NATMAP Shield Margin Project: The Flin Flon Belt, Trans-Hudson Orogen, Manitoba and Saskatchewan , 1999 .

[17]  C. Beaumont,et al.  Geodynamic models of crustal‐scale episodic tectonic accretion and underplating in subduction zones , 1999 .

[18]  J. Hall,et al.  Canada's LITHOPROBE project (collaborative, multidisciplinary geoseience research leads to new understanding of continental evolution) , 1999 .

[19]  B. Nemèth.  Structure of the lithosphere within the Trans-Hudson Orogen (results of the 1993 LITHOPROBE Trans-Hudson refraction experiment) , 1999 .

[20]  K. Ansdell,et al.  Coeval sedimentation, magmatism, and fold-thrust belt development in the Trans-Hudson Orogen: geochronological evidence from the Wekusko Lake area, Manitoba, Canada , 1999 .

[21]  Z. Hajnal,et al.  New seismic images of the crust in the central Trans-Hudson Orogen of Saskatchewan , 1998 .

[22]  Z. Hajnal,et al.  Structure of the lithospheric mantle beneath the Trans-Hudson Orogen, Canada , 1998 .

[23]  R. Clowes,et al.  Evidence for extensive tabular intrusions in the Precambrian shield of western Canada: A 160-km-long sequence of bright reflections , 1997 .

[24]  Z. Hajnal,et al.  Coincident vibroseis and dynamite surveys across the western flank of the Trans-Hudson Orogen , 1996 .

[25]  Z. Hajnal,et al.  Moho signature from wide-angle reflections: Preliminary results of the 1993 Trans-Hudson Orogen refraction experiment , 1996 .

[26]  Z. Hajnal,et al.  Seismic reflection images of high-angle faults and linked detachments in the Trans-Hudson Orogen , 1996 .

[27]  L. Brown,et al.  Crustal structure and evolution of the Trans‐Hudson orogen: Results from seismic reflection profiling , 1996 .

[28]  K. Ansdell,et al.  Kisseynew metasedimentary gneiss belt, Trans-Hudson orogen (Canada): Back-arc origin and collisional inversion , 1995 .

[29]  A. Green,et al.  Structure of a Paleoproterozoic continent-continent collision zone: a LITHOPROBE seismic reflection profile across the Trans-Hudson Orogen, Canada , 1994 .

[30]  A. Green,et al.  Three-dimensional collisional structure of the Trans-Hudson Orogen, Canada , 1994 .

[31]  A. Green,et al.  Paleo-Proterozoic thick-skinned tectonics: Lithoprobe seismic reflection results from the eastern Trans-Hudson Orogen , 1994 .

[32]  C. Beaumont,et al.  A geodynamic framework for interpreting crustal-scale seismic-reflectivity patterns in compressional orogens , 1994 .

[33]  J. Hall,et al.  Tectonic model for crustal seismic reflectivity patterns in compressional orogens , 1993 .

[34]  M. R. Stauffer,et al.  Regional setting and kinematic features of the Needle Falls Shear Zone, Trans-Hudson Orogen , 1993 .

[35]  Lionel Wilson,et al.  Giant radiating dyke swarms on Earth and Venus , 1993 .

[36]  Z. Hajnal,et al.  Deep seismic profile across a Proterozoic collision zone: surprises at depth , 1993, Nature.

[37]  J. Lewry,et al.  The Wathaman batholith: An Early Proterozoic continental arc in the Trans-Hudson orogenic belt, Canada , 1992 .

[38]  Dave Hale,et al.  Dip moveout processing , 1991 .

[39]  P. Hoffman,et al.  United Plates of America, The Birth of a Craton: Early Proterozoic Assembly and Growth of Laurentia , 1988 .

[40]  R. Macdonald,et al.  U-Pb Geochronology of Accreted Terranes in the Trans-Hudson Orogen, Northern Saskatchewan, Canada , 1987, Geological Society, London, Special Publications.

[41]  J. Lewry,et al.  Thermotectonic evolution of the churchill province in Northern Saskatchewan , 1980 .