Paleoproterozoic arc and ophiolitic rocks on the northwest-margin of the Trans-Hudson Orogen, Saskatchewan, Canada: their contribution to a revised tectonic framework for the orogen

Early to Late Paleoproterozoic magmatism in NE Brazil: The Alto Moxotó Terrane and its tectonic implications for the Pre-West Gondwana assembly

“…Polycyclic Paleoproterozoic evolution is well documented in orogenic terranes worldwide, mostly directly related to Paleoproterozoic supercontinents, such as the Trans-North China Belt orogen (Faure et al, 2004), Trans-Hudson orogen in the USA/Canada (White et al, 2000;Corrigan et al, 2009;Maxeiner et al, 2005), Ungava Orogen in Canada (St-Onge et al, 1992, 2000, and Oskarshamn-J€ onk€ oping Belt in Sweden (Manfeld et al, 2005;Ski€ old and Rutland, 2006). On the other hand, Statherian-Caliminian extensional events are also coherent with worldwide descriptions and are commonly referred to as the early break-up stages of large Paleoproterozoic land masses (Condie, 2002;Zhao et al, 2004;Meert, 2012).…”

“…Available studies suggest that Paleoproterozoic accretionary and collisional orogenesis similar to modern-style plate tectonics development (Windley, 1995;Faure et al, 2007) resulted in the amalgamation and formation of the Columbia Supercontinent (Rogers and Santosh, 2002;Hou et al, 2008;Meert, 2012;Murphy and Nance, 2013). Some well-preserved representative exposures of the Paleoproterozoic occur within Laurentia: the Trans-Hudson orogen (Hoffman, 1989;Maxeiner et al, 2005;Corrigan et al, 2009)…”

The distribution and composition of high‐velocity lower crust across the continental U.S.: Comparison of seismic and xenolith data and implications for lithospheric dynamics and history

“…The Wyoming Province and Medicine Hat Block are sutured together by the circa 1.86–1.71 Ga Great Falls tectonic zone [ Giletti , ; Harms et al ., ; Mueller et al ., ; O'Neill and Lopez , ]. The circa 1.78–1.75 Ga Cheyenne Belt [ Duebendorfer et al ., ; Karlstrom and Houston , ] bounds the Wyoming Province to the south, and both Archean blocks are bounded to the east by the circa 1.83–1.72 Ga Trans‐Hudson orogen [ Bickford et al ., ; Dahl et al ., ; Maxeiner et al ., ]. Crustal thickness estimates in Montana and Wyoming vary from 40 to 60 km [ Bensen et al ., ; Gilbert , ], with much of the region underlain by a layer of anomalously thick (10–30 km) and seismically fast lower crust referred to as the 7.x layer imaged previously using wide‐angle refraction/reflection data [ Gorman et al ., ; Rumpfhuber and Keller , ; Snelson et al ., ] and joint surface wave and receiver function studies [ Schutt et al ., ; Stachnik et al ., ; Yuan et al ., ].…”

Extraterrestrial factors and their role in the Earth’s tectonic evolution in the Early Precambrian

“…The extension indicators were swarms of high-Mg mafic dikes and other intrusions as well as ensialic rifts aged 2.0 Ga with an ophiolite or ophiolite-like rock association (Stern, 2008). Examples include the Cape Smith belt, normal to the Trans-Hudson Orogen (Scott et al, 1999), and the N-S belt of the Reindeer Zone in the northwestern part of this orogen (Maxeiner et al, 2005) along with the Savo-Ladoga paleorift and similar structures of Finland (Lahtinen, 2012), etc. Deformations of these rifts and the formation of large thrusts and wide collisional zones such as the Kola-Belomorian-Lapland collisional zone were related to compression processes.…”