Geology of the northern margin of the Trans-Hudson Orogen (Foxe Fold Belt), central Baffin Island, Nunavut

Corrigan, D; Scott, D J; St-Onge, M R

doi:10.4095/212249

Cited by 17 publications

(36 citation statements)

References 7 publications

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“…It is generally regarded as a continental margin succession (Morgan et al, 1975(Morgan et al, , 1976 originally deposited on the southeastern margin of the Archean Rae craton and subsequently deformed and metamorphosed during the ca. 1.92-1.80 Ga Trans-Hudson orogen (Corrigan et al, 2001;Scott et al, 2002;St-Onge et al, 2005, and references therein). Traditionally, it has been correlated with the Penrhyn Group on Melville Peninsula and the Karrat Group in western Greenland ( Fig.…”

Section: Geological Settingmentioning

confidence: 91%

“…White-to gray-weathering dolostone, marble, and calc-silicate strata of the Flint Lake formation are interlayered with minor to rare semipelite, pelite, quartzite, iron formation, and chert, and stratigraphically overlie the upper member of the Dewar Lakes formation (Morgan et al, 1976;Corrigan et al, 2001;Scott et al, 2002;St-Onge et al, 2005). The exposed thickness of this formation varies considerably both along and across strike, from several meters to 500-1000 m in the thickest exposures.…”

Section: Stratigraphy Of the Piling Groupmentioning

confidence: 94%

“…However, unlike time-correlative units on mainland Nunavut (e.g., Amer, Ketyet River, Chantrey, and Montresor groups), which record the development of an intracratonic basin (Rainbird et al, 2010), the Piling Group contains thicker and more extensive deep marine deposits that suggest continental separation as fi rst proposed by Morgan et al (1975Morgan et al ( , 1976. Although there is broad agreement that the Piling Group basin once faced an ocean along the southeastern Rae margin (e.g., Corrigan et al, 2001Corrigan et al, , 2009Scott et al, 2003;St-Onge et al, 2005, the nature, age, and tectonic evolution of the basin have not been fully documented.…”

Section: Introductionmentioning

confidence: 92%

“…1), comprises shallow-water siliciclastic-carbonate strata, mafi c-ultramafi c volcanic rocks, and deep-water basinal strata (e.g., Morgan et al, 1976;Henderson et al, 1979;Henderson and Tippett, 1980;Tippett, 1984a;Jackson, 2000;Corrigan et al, 2001;Scott et al, 2002Scott et al, , 2003. It is generally regarded as a continental margin succession (Morgan et al, 1975(Morgan et al, , 1976 originally deposited on the southeastern margin of the Archean Rae craton and subsequently deformed and metamorphosed during the ca.…”

Section: Geological Settingmentioning

confidence: 97%

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Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Wodicka

St-Onge

Corrigan

et al. 2014

Geological Society of America Bulletin

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The Paleoproterozoic Piling Group along the southeastern Rae margin, northern Canada, is characterized by thick, deep marine turbidite deposits not observed in timeequivalent, intracratonic basin units further southwest. Models invoked to explain this feature include development of a full-ocean, back-arc, or proto-ocean basin followed by turbidite sedimentation. We present new and existing U-Pb geochronological, Nd isotope, geochemical, and stratigraphic evidence that support a proto-ocean basin model, and we explore the events leading to the formation and closure of such a rift basin during the middle Paleoproterozoic. Sedimentation initiated largely after ca. 2160 Ma with deposition of craton-derived, shallow marine siliciclastic strata (Dewar Lakes formation). Continued extension resulted in accumulation of south-facing carbonate beds (Flint Lake formation) and likely concomitant, arclike tholeiitic to picritic volcanism and voluminous volcani clastic sedimentation (lower Bravo Lake formation) farther outboard at ca. 1980 Ma. Accumulation of intra basinal siliciclastic strata above lower Bravo Lake formation rocks may mark a hiatus in mafi cultramafic magmatism. By ca. 1923 Ma, upper Bravo Lake formation, within-platetype alkaline sill emplacement and vol canism occurred within highly extended crust. The oceanic island basalt-like signatures of the Bravo Lake formation rocks (but lack of depleted, mid-ocean-ridge basalt-type compositions) suggest that by this time the thinned Rae continental lithosphere had fragmented into small crustal block(s) and narrow zone(s) of incipient oceanic crust farther outboard of the Piling Group basin. Rapid subsidence of the southeastern Rae margin ensued, leading to deposition of euxinic (Astarte River formation) and overlying turbiditic strata (Longstaff Bluff formation). The post-ca. 1915 Ma northern turbiditic sedimentary units were likely derived from a thoroughly mixed, two-component source with possible input from the Snowbird tectonic zone and Bravo Lake formation, whereas the post-ca. 1930 Ma southern turbidite unit may have been sourced from the Meta Incognita microcontinent, presently exposed further south. We favor a rift margin over a foreland basin setting for the deposition of the northern turbidite deposits. Subsequent mantle upwelling associated with incipient ocean formation may have triggered melting of highly thinned continental crust resulting in emplacement of latestage, ca. 1897 Ma, contaminated rapakivi granite and highly differentiated mafi c sills. Our results are most consistent, albeit not exclusively, with the much debated model of asthenospheric upwelling and incipient rifting along the Rae-Hearne boundary farther southwest at ca.

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Section: Geological Settingmentioning

confidence: 91%

Section: Stratigraphy Of the Piling Groupmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 92%

Section: Geological Settingmentioning

confidence: 97%

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Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Wodicka

St-Onge

Corrigan

et al. 2014

Geological Society of America Bulletin

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“…The eastward thrust direction for the Karrat Fjord thrust system is at a high angle to that determined in equivalent tectonostratigraphic units in the Piling Group on Baffin Island, which has been thrust to the north (Corrigan et al 2001). This is not necessarily an inconsistency, as the position and number of orogenic sutures and tectonic terrains on southern and central Baffin Island is unresolved (Wodicka et al 2014, and references therein).…”

Section: Discussionmentioning

confidence: 92%

Basin evolution and destruction in an Early Proterozoic continental margin: the Rinkian fold–thrust belt of central West Greenland

Grocott

McCaffrey

2017

JGS

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In central West Greenland, early Palaeoproterozoic siliciclastic and carbonate sequences of the Karrat Group (shelf sequences of the Rae craton margin) were deposited in sedimentary basins controlled by NW-and SW-trending linked extensional fault systems. The shelf basins were later filled and overtopped by turbidite systems filling a foredeep advancing ahead of a thrust system -the Karrat Fjord thrust system -that propagated west to east. Deformation culminated in emplacement of basement-cored nappes, progressive deformation and high-grade metamorphism at c. 1.87 Ga. Reactivation of lower plate growth faults formed dome-and basin-like folds and related thrusts that refolded the structure of the Karrat Fjord thrust system and inverted the shelf basins. The southern Karrat Fjord thrust system was reworked in a belt of intense ductile NW-directed thrusting -the Nunaarsussuaq thrust system -formed at c. 1.84 Ga at the northern limit of the Nagssugtoqidian orogen. Kinematics of these events are at odds with the consensus view that the Rinkian fold-thrust belt is a northward extension of the Nagssugtoqidian orogen resulting from northsouth convergence between the Rae and North Atlantic cratons. Application of structural restoration techniques to basin analysis of Palaeoproterozoic rocks has potential to provide new insights into Proterozoic orogenic processes worldwide.

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Seismological structure of the 1.8 Ga Trans‐Hudson Orogen of North America

Gilligan

Bastow

Darbyshire

2016

Geochem Geophys Geosyst

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Precambrian tectonic processes are debated: what was the nature and scale of orogenic events on the younger, hotter, and more ductile Earth? Northern Hudson Bay records the Paleoproterozoic collision between the Western Churchill and Superior plates-the 1.8 Ga Trans-Hudson Orogeny (THO)-and is an ideal locality to study Precambrian tectonic structure. Integrated field, geochronological, and thermobarometric studies suggest that the THO was comparable to the present-day Himalayan-Karakoram-Tibet Orogen (HKTO). However, detailed understanding of the deep crustal architecture of the THO, and how it compares to that of the evolving HKTO, is lacking. The joint inversion of receiver functions and surface wave data provides new Moho depth estimates and shear velocity models for the crust and uppermost mantle of the THO. Most of the Archean crust is relatively thin (39 km) and structurally simple, with a sharp Moho; upper-crustal wave speed variations are attributed to postformation events. However, the QuebecBaffin segment of the THO has a deeper Moho (45 km) and a more complex crustal structure. Observations show some similarity to recent models, computed using the same methods, of the HKTO crust. Based on Moho character, present-day crustal thickness, and metamorphic grade, we support the view that southern Baffin Island experienced thickening during the THO of a similar magnitude and width to present-day Tibet. Fast seismic velocities at >10 km below southern Baffin Island may be the result of partial eclogitization of the lower crust during the THO, as is currently thought to be happening in Tibet.

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Geology of the northern margin of the Trans-Hudson Orogen (Foxe Fold Belt), central Baffin Island, Nunavut

Cited by 17 publications

References 7 publications

Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Basin evolution and destruction in an Early Proterozoic continental margin: the Rinkian fold–thrust belt of central West Greenland

Seismological structure of the 1.8 Ga Trans‐Hudson Orogen of North America

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