Suture-zone geometry along an irregular Paleoproterozoic margin: The Superior boundary zone, Manitoba, Canada

White, Don; Lucas, Stephen Bernard; Bleeker, Wouter; Hajnal, Z.; Lewry, John F.; Zwanzig, H. V.

doi:10.1130/0091-7613(2002)030<0735:szgaai>2.0.co;2

Cited by 31 publications

(11 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After a wedge develops, the conjugate shear zones bound the wedge above and below by roof and sole thrust faults having opposite vergence [ Pfiffner et al , 2000]. Above the roof thrust, deformation is polyphase because of the reversal of relative transport direction between the roof slab and wedge [ Price , 1986; White et al , 2002]. With progressing collision, the wedge from the incoming slab continues to fold up into the roof of the overthrusting slab and can become exposed as a culmination (e.g., uplift plug [ Beaumont et al , 1999]).…”

Section: Discussionmentioning

confidence: 99%

Coolwater culmination: Sensitive high‐resolution ion microprobe (SHRIMP) U‐Pb and isotopic evidence for continental delamination in the Syringa Embayment, Salmon River suture, Idaho

et al. 2008

View full text Add to dashboard Cite

During dextral oblique translation along Laurentia in western Idaho, the Blue Mountains superterrane underwent clockwise rotation and impinged into the Syringa embayment at the northern end of the Salmon River suture. Along the suture, the superterrane is juxtaposed directly against western Laurentia, making this central Cordilleran accretionary‐margin segment unusually attenuated. In the embayment, limited orthogonal contraction produced a crustal wedge of oceanic rocks that delaminated Laurentian crust. The wedge is exposed through Laurentian crust in the Coolwater culmination as documented by mapping and by sensitive high‐resolution ion microprobe U‐Pb, Sri, and ɛNd data for gneisses that lie inboard of the suture. The predominant country rock is Mesoproterozoic paragneiss overlying Laurentian basement. An overlying Neoproterozoic (or younger) paragneiss belt in the Syringa embayment establishes the form of the Cordilleran miogeocline and that the embayment is a relict of Rodinia rifting. An underlying Cretaceous paragneiss was derived from arc terranes and suture‐zone orogenic welt but also from Laurentia. The Cretaceous paragneiss and an 86‐Ma orthogneiss that intruded it formed the wedge of oceanic rocks that were inserted into the Laurentian margin between 98 and 73 Ma, splitting supracrustal Laurentian rocks from their basement. Crustal thickening, melting and intrusion within the wedge, and folding to form the Coolwater culmination continued until 61 Ma. The embayment formed a restraining bend at the end of the dextral transpressional suture. Clockwise rotation of the impinging superterrane and overthrusting of Laurentia that produced the crustal wedge in the Coolwater culmination are predicted by oblique collision into the Syringa embayment.

show abstract

Section: Discussionmentioning

confidence: 99%

Coolwater culmination: Sensitive high‐resolution ion microprobe (SHRIMP) U‐Pb and isotopic evidence for continental delamination in the Syringa Embayment, Salmon River suture, Idaho

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Along most of its periphery, the Superior Craton remained the lower crustal block during collision, forming the footwall to accreted juvenile terranes, such as the Cape Smith klippe (Hoffman 1985;Lucas 1989). One exception to this general rule is the Thompson Nickel Belt, which began as a normal, SE-vergent Proterozoic-on-Archaean imbricate stack, but eventually developed retroshears that thrust the Superior Craton basement onto the orogen internides during 1.82 -1.77 Ga sinistral transpression (Ellis & Beaumont 1999;White et al 2002). The initial crustal architecture, with the Reindeer Zone overthrust onto the Superior Craton, may explain why most of the eastern portion of the Kisseynew Basin is currently underlain by Archaean crust .…”

Section: Cumberland Batholith and 'Gneissic Suite' Of The Narsajuaq Arcmentioning

confidence: 99%

The Palaeoproterozoic Trans-Hudson Orogen: a prototype of modern accretionary processes

et al. 2009

View full text Add to dashboard Cite

The Trans-Hudson Orogen (THO) of North America is one of the earliest orogens in Earth's history that evolved through a complete Wilson Cycle. It represents c. 150 Ma of opening of the Manikewan Ocean, from c. 2.07-1.92 Ga, followed by its demise in the interval 1.92-1.80 Ga, during the final phase of growth of the Supercontinent Columbia (Nuna). It is characterized by three lithotectonic divisions: (i) Churchill margin (or peri-Churchill); (ii) Reindeer Zone; and (iii) Superior margin (or peri-Superior). The peri-Churchill realm records progressive outward continental growth by accretion of Archaean to Palaeoproterozoic micro-continents (Hearne, Meta Incognita/Core Zone, Sugluk) and eventually arc terranes (La Ronge-Lynn Lake) to the Slave-Rae nuclei, with attendant development of orogenies and basin inversions related to the specific accretion events (1.92-1.89 Ga Snowbird; 1.88-1.865 Ga Foxe; 1.87-1.865 Ga Reindeer orogenies). The Reindeer Zone is characterized by primitive to evolved oceanic arcs, back-arc basins, oceanic crust and ocean plateaus that formed during closure of the Manikewan Ocean, and accretion of a micro-continent (Sask Craton) and smaller Archaean crustal fragments. The terminal phase of the Trans-Hudson orogeny represents collision between the Superior craton, the Reindeer Zone and the composite western Churchill Province during the interval 1.83-1.80 Ga.

show abstract

“…In three dimensions, plate tectonic boundaries for linear belts are tied to, and influence, asthenospheric convection, whereas in plume settings, the lithosphere moves over generally fixed zones of asthenospheric upwelling. geometry recording final collision with the Superior craton as revealed by seismic reflection profiling (White et al, 2002). Paleomagnetic data from the Trans-Hudson orogen were interpreted by Symons and Harris (2005) to suggest that the Archean Hearne and Superior cratons were separated by the ~5500-km-wide Manikewan ocean during ca.…”

Section: Evidence For Pre-neoproterozoic Subduction Ophiolites and mentioning

confidence: 99%

Precambrian plate tectonics: Criteria and evidence

Cawood¹,

Kröner

Pisarevsky³

2006

Gsa Today

275

111

View full text Add to dashboard Cite

Paleomagnetic, geochemical, and tectonostratigraphic data establish that plate tectonics has been active since at least 3.1 Ga. Reliable paleomagnetic data demonstrate differential horizontal movements of continents in Paleoproterozoic and Archean times. Furthermore, the dispersal and assembly of supercontinents in the Proterozoic requires lateral motion of lithosphere at divergent and convergent plate boundaries. Wellpreserved ophiolites associated with island-arc assemblages and modern-style accretion tectonics occur in the Paleoproterozoic Trans-Hudson orogen of the Canadian Shield, the Svecofennian orogen of the Baltic Shield and in the Mazatzal-Yavapai orogens of southwestern Laurentia. These rocks have trace element signatures almost identical to those found in rocks of modern intra-oceanic arcs and include ore deposits typical of modern subduction settings. The discovery of Archean eclogites in the eastern Baltic Shield; the presence of late Archean subduction-related Kuroko-type volcanogenic massive sulfide deposits in the Abitibi greenstone belt of the Canadian Shield; the discovery of mid-Archean island arc volcanics, including the oldest known boninites and adakites; and isotopic data from the world's oldest zircons all argue for modern-style subduction processes possibly back to the Hadean. Seismic images of preserved Paleoproterozoic and Archean suture zones further support this view. These data require a tectonic regime of lithospheric plates similar to the Phanerozoic Earth.

show abstract

Suture-zone geometry along an irregular Paleoproterozoic margin: The Superior boundary zone, Manitoba, Canada

Cited by 31 publications

References 16 publications

Coolwater culmination: Sensitive high‐resolution ion microprobe (SHRIMP) U‐Pb and isotopic evidence for continental delamination in the Syringa Embayment, Salmon River suture, Idaho

Coolwater culmination: Sensitive high‐resolution ion microprobe (SHRIMP) U‐Pb and isotopic evidence for continental delamination in the Syringa Embayment, Salmon River suture, Idaho

The Palaeoproterozoic Trans-Hudson Orogen: a prototype of modern accretionary processes

Precambrian plate tectonics: Criteria and evidence

Contact Info

Product

Resources

About