Geology of the Archean Rae Craton and Mary River Group and the Paleoproterozoic Piling Group, central Baffin Island, Nunavut

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

doi:10.4095/214208

Cited by 5 publications

(37 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2740-2725 Ma Eqe Bay and Isotorq greenstone belts, all of which are intruded by 2726 +3/-2-2658 +16/-14 Ma granodioritic to monzogranitic and rare tonalitic plutonic rocks (Figs. 1 and 2; Jackson et al, 1990;Scott and de Kemp, 1999;Jackson, 2000;Wodicka et al, 2002;Bethune and Scammell, 2003;Scott et al, 2003;Young et al, 2004Young et al, , 2007St-Onge et al, 2005;Johns and Young, 2006). Various felsic plutonic rocks, ranging in age from 1897 +7/-4 to ca.…”

Section: Geological Settingmentioning

confidence: 97%

“…The upper member is composed of thin beds of quartzite to psammite and rusty semipelite to pelite. The overall thickness of the Dewar Lakes formation varies signifi cantly from less than a meter to locally greater than ~1000 m. Thickness variability may refl ect primary sedimentary depocenters (Tippett, 1984a;Jackson, 2000;Scott et al, 2003). Basal quartzite and rare psammite of the lower Dewar Lakes formation are in stratigraphic (locally reworked) contact with underlying Archean orthogneissic and plutonic rocks, and the formation as a whole is interpreted as a clastic sheet deposited on Rae basement.…”

Section: Stratigraphy Of the Piling Groupmentioning

confidence: 97%

“…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%

“…The exposed thickness of this formation varies considerably both along and across strike, from several meters to 500-1000 m in the thickest exposures. The overall decrease in carbonate material toward the south led Scott et al (2002Scott et al ( , 2003 to suggest that the Flint Lake formation originally formed a relatively narrow (75-100 km wide) southfacing carbonate shelf adjacent and parallel to the southeastern edge of the Rae craton, with signifi cant along-strike variation in primary thickness.…”

Section: Stratigraphy Of the Piling Groupmentioning

confidence: 98%

See 4 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: Geological Settingmentioning

confidence: 97%

Section: Stratigraphy Of the Piling Groupmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 92%

Section: Geological Settingmentioning

confidence: 97%

Section: Stratigraphy Of the Piling Groupmentioning

confidence: 98%

See 3 more Smart Citations

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

View full text Add to dashboard Cite

show abstract

Central Baffin electromagnetic experiment (CBEX): Mapping the North American Central Plains (NACP) conductivity anomaly in the Canadian arctic

Evans

Jones

Spratt

et al. 2005

Physics of the Earth and Planetary Interiors

View full text Add to dashboard Cite

Over the summers of 2001 and 2002, a 45 station, 500-km-long regional magnetotelluric (MT) profile was acquired on central Baffin Island in the eastern Canadian arctic. This Central Baffin electromagnetic experiment (CBEX) profile traverses the northern margin of the Paleoproterozoic Trans-Hudson Orogen (THO). In its southern segment, within the juvenile rocks of the orogen, the profile lies on Paleoproterozoic meta-sedimentary strata known as the Piling Group, and the profile extends northwards onto the Archean Rae craton. The primary goal of the experiment was to determine the subsurface geometry of major geological boundaries and to define regional electrical structures. Field observations and laboratory analyses show that one particular horizon within the Piling Group, the sulphidic-graphitic Astarte River formation, is highly conductive and can be mapped and used as structural proxy for the base of the Piling Group. The laboratory results imply that the source of the enhanced conductivity in the Astarte River formation is the high content of interconnected graphite, and that the host rocks are highly anisotropic due to bedding. Mapping this formation in depth images the base of the Piling Group basin well. There is high contrast in electrical conductivity between the Piling Group meta-sedimentary rocks and the Archean granites and gneissic complexes of the Rae craton to the north. The lower crust of the Rae craton in this area is moderately conductive (some 100 s m), in contrast to Rae lower crust observed elsewhere in Canada, and this observation is not readily explained. The lithospheric mantle beneath

show abstract

Trans‐Hudson Orogen of North America and Himalaya‐Karakoram‐Tibetan Orogen of Asia: Structural and thermal characteristics of the lower and upper plates

2006

View full text Add to dashboard Cite

[1] The Trans-Hudson Orogen (THO) of North America and the Himalaya-Karakoram-Tibetan Orogen (HKTO) of Asia preserve a Paleoproterozoic and Cenozoic record, respectively, of continentcontinent collision that is notably similar in scale, duration and character. In THO, the tectonothermal evolution of the lower plate involves (1) early thinskinned thrusting and Barrovian metamorphism, (2) out-of-sequence thrusting and high-T metamorphism, and (3) fluid-localized reequilibration, anatexis, and leucogranite formation. The crustal evolution of the Indian lower plate in HKTO involves (1) early subduction of continental crust to ultrahigh pressure (UHP) eclogite depths, (2) regional Barrovian metamorphism, and (3) widespread high-T metamorphism, anatexis, and leucogranite formation. The shallow depths of the high-T metamorphism in HKTO are consistent with early to mid-Miocene ductile flow of an Indian lower plate midcrustal channel, from beneath the southern Tibetan Plateau to the Greater Himalaya. Melt weakening of the lower plate in THO is not observed at a similar scale probably due to the paucity of pelitic lithologies. Tectonothermal events in the upper plate of both orogens include precollisional accretion of crustal blocks, emplacement of Andean-type plutonic suites, and high-T metamorphism. Syncollisional to postcollisional events include emplacement of garnet-biotite-muscovite leucogranites, anatectic granites, and sporadic metamorphism (up to 90 Myr following the onset of collision in THO). Comparing the type and duration of tectonothermal events for THO and HKTO supports the notion of tectonic uniformitarianism for at least the later half of dated Earth history and highlights the complementary nature of the rock record in an older ''exhumed'' orogen compared to one undergoing present-day orogenesis.

show abstract

Geology of the Archean Rae Craton and Mary River Group and the Paleoproterozoic Piling Group, central Baffin Island, Nunavut

Cited by 5 publications

References 0 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

Central Baffin electromagnetic experiment (CBEX): Mapping the North American Central Plains (NACP) conductivity anomaly in the Canadian arctic

Trans‐Hudson Orogen of North America and Himalaya‐Karakoram‐Tibetan Orogen of Asia: Structural and thermal characteristics of the lower and upper plates

Contact Info

Product

Resources

About