Geochronological and kinematic constraints on crustal shortening and escape in a two-sided oblique-slip collisional and magmatic orogen, Paleoproterozoic Taltson magmatic zone, northeastern Alberta

McDonough, M R; McNicoll, Vicki J.; Schetselaar, Ernst; Grover, Timothy W.

doi:10.1139/cjes-37-11-1549

Cited by 10 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among the notable domains, the Taltson magmatic zone (2.02–1.91 Ga) constitutes the southern segment of the 2,500 km Taltson‐Thelon orogen (Hoffman, , ) and contains lithologically diverse rock types of granitoids, metasedimentary gneisses, granitic basement gneisses, and amphibolites (Chacko et al, ). The origin of Taltson has been debated, either as a product of eastward subduction of oceanic crust beneath a continental margin (McDonough et al, ; Ross et al, ; Ross & Eaton, ) or, alternatively, as a distant hinterland of a convergent plate margin in a continent‐interior setting (Chacko et al, ; De et al, ). To the west of the Taltson, Buffalo Head Terrane (BHT) and Chinchaga domain form the core of the Proterozoic accreted terranes.…”

Section: Introductionmentioning

confidence: 99%

A New Appraisal of Lithospheric Structures of the Cordillera‐Craton Boundary Region in Western Canada

Chen

Hung

2018

Tectonics

View full text Add to dashboard Cite

The Western Canada Sedimentary Basin marks a boundary zone between the Precambrian North American craton and the Phanerozoic Cordillera. Its crystalline basement has documented more than 3 billion years of evolution history of western Laurentia. Here we conduct a high‐resolution survey of the mantle P and S wave velocities using finite‐frequency tomography. Our models show pronounced eastward increases of 4% P and 6% S wave velocities beneath the foreland region, which define a sharp seismic Cordillera‐Craton boundary. In the cratonic region, distinctive high‐ (>2%) velocity anomalies representing depleted mantle lithospheres are well correlated with major Precambrian crustal domains. The largest lithosphere thickness contrast coincides with the Snowbird Tectonic Zone, where the Hearne province extends down to ~300 km, nearly 100 km deeper than the Proterozoic terranes in northern Alberta. In the latter region, a pronounced cylindrical negative velocity anomaly extends subvertically from 75 to ~300‐km depth, which potentially results from significant tectonothermal modifications during subduction and/or plume activities. At the basin scale, mantle velocities show no apparent correlations with surface heat flux, suggesting a minimum mantle contribution to the regional thermal variability. Furthermore, the long‐wavelength isostatic gravity correlates negatively with the velocities, which confirms that the melt extraction from Precambrian cratons is responsible for the formation of highly depleted mantle lithospheres. Moreover, our model reveals the increased concentrations of kimberlites and lamproites near the zones of high horizontal velocity gradients. The distinct spatial pattern may reflect either preferential formation or eruption of potentially diamondiferous rocks at lithospheric weak zones near the western margin of Laurentia.

show abstract

Section: Introductionmentioning

confidence: 99%

A New Appraisal of Lithospheric Structures of the Cordillera‐Craton Boundary Region in Western Canada

Chen

Hung

2018

Tectonics

View full text Add to dashboard Cite

show abstract

“…The Archean basement was variably reworked or intruded between 2.6 and 2.5 Ga (e.g. Dumond, Goncalves, Williams, & Jercinovic, 2010;Mahan et al, 2008;Martel et al, 2008), 2.5 and 2.2 Ga (Berman, Pehrsson, et al, 2013;Hartlaub et al, 2005;Hartlaub, Heaman, Chacko, & Ashton, 2007), 2.11 Ga (Thiessen et al, 2019), and 2.0 and 1.85 Ga (Baldwin, Bowring, Williams, & Williams, 2004;Bethune et al, 2013;Mahan, Goncalves, et al, 2006;Martel et al, 2008;McDonough, McNicoll, Schetselaar, & Grover, 2000). Metasedimentary sequences deposited after c. 2.2-2.0 Ga and unconformably overlay Archean basement, are documented along the craton's margins ( Figure 1) and were subsequently deformed and metamorphosed together with their basement at c. 1.9 Ga (Martel et al, 2008).…”

Section: South Rae Cratonmentioning

confidence: 99%

“…Metasedimentary sequences deposited after c. 2.2-2.0 Ga and unconformably overlay Archean basement, are documented along the craton's margins ( Figure 1) and were subsequently deformed and metamorphosed together with their basement at c. 1.9 Ga (Martel et al, 2008). Prior to final cratonization, the South Rae was affected by the c. 2.0-1.9 Ga Taltson Orogen along its western margin (McDonough et al, 2000) and the c. 1.9 Ga Snowbird Orogen along its eastern margin (Berman et al, 2007), the latter of which is suggested to be an early phase of microcontinent accretion of the Trans-Hudson Orogen (Corrigan, 2012). Additional far-field effects from the collision of the Sask and Superior cratons to the composite Rae-Hearne cratons (Western Churchill Province) occurred between c. 1.87 and 1.80 Ga (Corrigan, 2012).…”

Section: South Rae Cratonmentioning

confidence: 99%

“…The Archean basement was variably reworked or intruded between 2.6 and 2.5 Ga (e.g. Dumond, Goncalves, Williams, & Jercinovic, 2010; Mahan et al., 2008; Martel et al., 2008), 2.5 and 2.2 Ga (Berman, Pehrsson, et al, 2013; Hartlaub et al., 2005; Hartlaub, Heaman, Chacko, & Ashton, 2007), 2.11 Ga (Thiessen et al., 2019), and 2.0 and 1.85 Ga (Baldwin, Bowring, Williams, & Williams, 2004; Bethune et al., 2013; Mahan, Goncalves, et al, 2006; Mahan, Williams, et al, 2006; Martel et al., 2008; McDonough, McNicoll, Schetselaar, & Grover, 2000). Metasedimentary sequences deposited after c .…”

Section: Geological Contextmentioning

confidence: 99%

See 1 more Smart Citation

The distinct metamorphic stages and structural styles of the 1.94–1.86 Ga Snowbird Orogen, Northwest Territories, Canada

Thiessen

Gibson

Regis

et al. 2020

Journal Metamorphic Geology

View full text Add to dashboard Cite

show abstract

“…This movement was followed immediately by post-collision isostatic-compensation rising (1.8 Ga, Ray Province [Scott, 1998]). The subduction-and collision-related granites were intruded 1.96-1.99 and 1.93-1.95 years ago, respectively, also on the western margin of the Churchill Province, in the Telon volcanic arc [Jackson and Berman, 2000;McDonough et al, 1995] (Figure 5). These data confirm the existence of the Siberia-Laurentia Paleocontinent [Condie and Rosen, 1994].…”

Section: Siberian North American and Other Cratonsmentioning

confidence: 99%

Siberian craton - a fragment of a Paleoproterozoic supercontinent

Rosen¹

2002

Russ. J. Earth Sci.

View full text Add to dashboard Cite

The sialic (volcanogenic) material of the terranes in 3the Siberian fragment of a Paleoproterozoic supercontinent separated from the mantle 3.5, 3.3, 3.0, and 2.5 billion years ago. The collision zones (sutures) between the terranes are dated by granitoids which melted from the crust of the terranes in two periods of time: 1.9 and 1.8 billion years ago. Local metamorphism and granite generation inside the collision (fault) zones were accompanied by synchronous areal dry granulite metamorphism in the adjacent terranes. This implies a fairly uniform field of high temperatures and pressures typical of the thicker crust of the collision prism. The amalgamation of the continental-crust fragments was terminated by the formation of a huge mountain massif ca. 1.8 billion years ago. Later, these mountains were wholly eroded. Early Riphean platform-type clastic sediments started to accumulate on the resulting peneplain 1.65 billion years ago, i. e., 150 million years after the end of the collision. The Siberian Craton is a part of the Pangea-1 Paleoproterozoic supercontinent which originated from the fragments of the broken Archean Pangea-0 supercontinent which had existed as microcontinents with their own sedimentary-volcanic covers which were transformed, after the collision, to the foldbelts superimposed over the basements of the old terranes. The exception was the Paleoproterozoic Akitkan volcanic belt which evolved first as a volcanic arc and later, in the course of the total amalgamation, was thrust over the ancient basement and involved in anorogenic acid magmatism (A-granites).

show abstract

Geochronological and kinematic constraints on crustal shortening and escape in a two-sided oblique-slip collisional and magmatic orogen, Paleoproterozoic Taltson magmatic zone, northeastern Alberta

Cited by 10 publications

References 0 publications

A New Appraisal of Lithospheric Structures of the Cordillera‐Craton Boundary Region in Western Canada

A New Appraisal of Lithospheric Structures of the Cordillera‐Craton Boundary Region in Western Canada

The distinct metamorphic stages and structural styles of the 1.94–1.86 Ga Snowbird Orogen, Northwest Territories, Canada

Siberian craton - a fragment of a Paleoproterozoic supercontinent

Contact Info

Product

Resources

About