Geology of a transect through the southern Margin of the Foxe Fold Belt, central Baffin Island, District of Franklin

Tippett, C R

doi:10.4095/129953

Cited by 6 publications

(29 citation statements)

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“…6). Estimated thickness is approximately <0.5-1 km throughout the belt , with thickness increasing toward the north (Tippett, 1985). Above the Dewar Lakes Formation, there is a transitional contact with intercalated metasandstones and calcsilicates passing to (E) annotated photograph showing scour structure and cross-bedding (geochronology sample z10536); (F) cross-bedding and scour structure in the uppermost metasandstone unit (same outcrop as E).…”

Section: Piling Groupmentioning

confidence: 95%

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Sedimentological and geochemical basin analysis of the Paleoproterozoic Penrhyn and Piling groups of Arctic Canada

Partin

Bekker

Corrigan

et al. 2014

Precambrian Research

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Section: Piling Groupmentioning

confidence: 95%

“…1 and 5). Previous work has defined a stratigraphic framework for the Piling Group (Morgan, 1983;Tippett, 1978Tippett, , 1985Corrigan et al, 2001;Scott et al, 2002;Johns et al, 2006;Rainbird et al, 2010) and is summarized in Fig. 6.…”

Section: Piling Groupmentioning

confidence: 99%

Sedimentological and geochemical basin analysis of the Paleoproterozoic Penrhyn and Piling groups of Arctic Canada

Partin

Bekker

Corrigan

et al. 2014

Precambrian Research

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“…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 Piling Group is divided into fi ve formations (Morgan, 1983;Tippett, 1984a), which comprise, in ascending stratigraphic order, the Dewar Lakes, Flint Lake and Bravo Lake, Astarte River, and Longstaff Bluff formations (Figs. 2 and 3).…”

Section: Stratigraphy Of the Piling Groupmentioning

confidence: 99%

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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“…These fiords were chosen because of the variations in the bedrock geology (Fig. 6), particularly the variations in the outcrop of Archean granite gneisses and the younger metasediments of the Foxe Fold Belt (Tippett, 1984). Table Il lists data on the area and surface bedrock of the drainage basins that supply water and sediment to the three main fiords (see Figs.…”

Section: Sedimentation and Glacial Events In East-central Baffin Islamentioning

confidence: 99%

Fiord to Deep Sea Sediment Transfers along the Northeastern Canadian Continental Margin: Models and Data

Andrews¹

2007

gpq

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In Alaskan fiords, sedimentation rates are high; during a glacial advance fiord-basin sediments are transported to the ice front to form a shoal which reduces the calving rate. Thus, during successive glacial cycles, sediment is initially stored and then removed from fiord basins. In the fiords of eastern Baffin Island sedimentation rates are, and were, much lower (< 1000 Kg/m2 ka). and fiord-basin fills may span several glacial cycles. This hypothesis is in keeping with the relatively low sedimentation rates on the adjacent shelf (50 to 500 kg/m2 ka) and deep-sea plain (< = 50 kg/m2 ka). The advance of outlet glaciers through these arctic fiords may be explained by the in situ growth of a floating ice-shelf, grounded at the mouth of the fiord. The extent of late Foxe Glaciation in McBeth and ltirbilung fiords can be delimited by raised marine deltas (50-85 m asl) with 14C dates on in situ shells and whalebone of >54 ka. Holocene raised beaches are lower and date <10 ka. These data, plus the absence of tills in raised marine sections along the outer coast, make it difficult to extend grounded ice onto the shelf during the 18 ka global maximum. Piston cores from Tingin. ltirbilung and McBeth fiords vary between 4 and 11 m in length, but only sample a proportion of the total basin-fills.

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Geology of a transect through the southern Margin of the Foxe Fold Belt, central Baffin Island, District of Franklin

Abstract: The study area lies on the southern margin of the Foxe Fold Belt, a major Hudsonian structural feature on central Baffin Island which is defined by the presence of Aphebian (Early Proterozoic) meta

Cited by 6 publications

References 0 publications

Sedimentological and geochemical basin analysis of the Paleoproterozoic Penrhyn and Piling groups of Arctic Canada

Sedimentological and geochemical basin analysis of the Paleoproterozoic Penrhyn and Piling groups of Arctic 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

Fiord to Deep Sea Sediment Transfers along the Northeastern Canadian Continental Margin: Models and Data

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