Mesozoic rift to post-rift tectonostratigraphy of the Sverdrup Basin, Canadian Arctic

Hadlari, Thomas; Midwinter, Derrick; Galloway, Jennifer M.; Dewing, Keith; Durbano, Andrew M.

doi:10.1016/j.marpetgeo.2016.05.008

Cited by 51 publications

(65 citation statements)

References 30 publications

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“…Second, the more localized increase in accommodation could have been caused by normal faulting as a precursor to the subsequent Late Jurassic to Cretaceous rifting between Norway and Greenland (Faleide et al, 1993). Small-scale tectonic activity in this period has not been addressed in detail by previous studies in the NBSB and is beyond the scope of the present study, but might correspond to similar rift-onset development in the Sverdrup Basin (Hadlari et al, 2016).…”

Section: Geological Backgroundmentioning

confidence: 78%

Evidence for Late Triassic provenance areas and Early Jurassic sediment supply turnover in the Barents Sea Basin of northern Pangea

Klausen¹,

Müller²,

Sláma³

et al. 2016

Lithosphere

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We used detrital zircon fractions from the Late Triassic to Early Jurassic sedimentary succession in the Norwegian Barents Sea to constrain the role of eastern provenance areas in the basin infill history of the Northern Pangea Boreal basin. Geochronological data from sedimentary rocks in this succession reveal detrital zircon ages that are very close to the biostratigraphically defined maximum depositional age of the two lowermost intervals: The Norian to Rhaetian Fruholmen Formation show U-Pb minimum ages of 208.3 ± 4.2 Ma (discordant by-0.58) and 213.8 ± 5 Ma (discordant by 0.8), and the Rhaetian to Sinemurian Tubåen Formation is 200.6 ± 4.9 Ma (discordant by-3.99) at its minimum. These are the youngest ages thus far documented in the Norwegian Barents Sea, and they demonstrate that a provenance area was magmatically active while, or shortly before, these formations were being deposited. Such protolith ages have not been documented close to the study area, but based on the regional tectonic setting and paleogeography, we argue that the Novaya Zemlya protrusion of the northern Uralian orogen was the most likely provenance area in the region. The Sinemurian to Pliensbachian Nordmela Formation samples yielded, with an exception of a single detrital zircon age of 211 ± 4.3 Ma, a consistent 240-237 Ma minimum detrital zircon age, which suggests that either the magmatic activity or the sediment supply had come to an end by Sinemurian times. This turnover can be explained by a change in the hinterland drainage pattern. This study documents that eastern provenance areas were actively supplying sediments into the Norwegian Barents Sea Basin later than previously assumed, and our data offer age constraints for tectonic activity in the basin and its hinterland inferred from the changes in sediment supply to the basin.

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Section: Geological Backgroundmentioning

confidence: 78%

Evidence for Late Triassic provenance areas and Early Jurassic sediment supply turnover in the Barents Sea Basin of northern Pangea

Klausen¹,

Müller²,

Sláma³

et al. 2016

Lithosphere

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“…After the first rift phase, marine deposition persisted through the Permian and Triassic periods. A second phase of rifting began in the Early Jurassic, continued through the Late Jurassicearliest Cretaceous interval, and then ceased in the Sverdrup Basin when seafloor spreading began in the adjacent proto-Amerasia Basin to form the Arctic Ocean (Hadlari et al 2016). Deposition in the Sverdrup Basin ended in the Palaeogene Period due to regional compression and widespread uplift associated with the Eurekan Orogeny (Embry & Beauchamp, 2019).…”

Section: Study Areamentioning

confidence: 99%

Finding the VOICE: organic carbon isotope chemostratigraphy of Late Jurassic – Early Cretaceous Arctic Canada

et al. 2019

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A new carbon isotope record for two high-latitude sedimentary successions that span the Jurassic–Cretaceous boundary interval in the Sverdrup Basin of Arctic Canada is presented. This study, combined with other published Arctic data, shows a large negative isotopic excursion of organic carbon (δ13Corg) of 4‰ (V-PDB) and to a minimum of −30.7‰ in the probable middle Volgian Stage. This is followed by a return to less negative values of c. −27‰. A smaller positive excursion in the Valanginian Stage of c. 2‰, reaching maximum values of −24.6‰, is related to the Weissert Event. The Volgian isotopic trends are consistent with other high-latitude records but do not appear in δ13Ccarb records of Tethyan Tithonian strata. In the absence of any obvious definitive cause for the depleted δ13Corg anomaly, we suggest several possible contributing factors. The Sverdrup Basin and other Arctic areas may have experienced compositional evolution away from open-marine δ13C values during the Volgian Age due to low global or large-scale regional sea levels, and later become effectively coupled to global oceans by Valanginian time when sea level rose. A geologically sudden increase in volcanism may have caused the large negative δ13Corg values seen in the Arctic Volgian records but the lack of precise geochronological age control for the Jurassic–Cretaceous boundary precludes direct comparison with potentially coincident events, such as the Shatsky Rise. This study offers improved correlation constraints and a refined C-isotope curve for the Boreal region throughout latest Jurassic and earliest Cretaceous time.

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“…Instead, these models favor continuity with continentward dipping subduction systems along strike in the Cordillera (Miller et al, ). With breakup of Arctic Alaska from the Canadian Arctic margin possibly to have begun around 130 Ma, extension due to rollback would have become focused within Arctic Alaska after 125 Ma (Hadlari et al, ), setting the stage for the exhumation event inferred in this study. In this north dipping model, onset of magmatism at depth and/or adjacent to the Brooks Range may have thermally weakened the crust, driving extension and/or providing fluids to assist regional metamorphism.…”

Section: Discussionmentioning

confidence: 82%

Greenschist Facies Metamorphic Zircon Overgrowths as a Constraint on Exhumation of the Brooks Range Metamorphic Core, Alaska

2018

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Like many other mountain belts, the metamorphic core or hinterland of the Brooks Range fold and thrust belt in Arctic Alaska is characterized by multiply deformed and polymetamorphosed rocks whose histories have been challenging to decipher and thus difficult to relate to the supracrustal history of the orogen. The multiple greenschist and blueschist facies metamorphic events have been particularly difficult to resolve. This study provides petrologic context for recently identified low-temperature metamorphic zircon overgrowths at two localities across some 200 km of orogenic strike that offer a unique and precise constraint on the timing of events recorded in the Brooks Range hinterland. In consideration of microstructural context, graphite thermometry, metamorphic mineral inclusions, and zircon trace element and Lu-Hf-isotope data, metamorphic zircon growth at 114 ± 5 Ma in the southern Brooks Range is interpreted to coincide with greenschist facies metamorphism, most probably linked to decompression and/or increased temperatures within the orogenic core. Their age coincides with a proposed pulse of extension within a >600-km shear zone along the southern flank of the Brooks Range and a regional flare-up in magmatism and pronounced subsidence within hinterland depocenters (Yukon-Koyukuk Basin). These regional events are consistent with subduction retreat/rollback in mid-Cretaceous time. This study adds to a growing body of literature demonstrating the importance of searching for and characterizing metamorphic zircon growth in low-to medium-grade metamorphic terranes to provide better constraints on otherwise cryptic tectonic events.Plain Language Summary Rocks within mountain belts typically contain metamorphic minerals and textures that grew and developed in response to heating, burial, and deformation. In order to understand the evolution of mountains and the plate tectonic interactions that formed them, it is important to be able to determine when those metamorphic minerals and textures grew. The minerals best suited to directly dating tectonic events typically only grow at high temperatures (like >550°C), whereas minerals that grow at lower temperatures are often easily disturbed during subsequent heating or tectonic events, rendering their ages suspect. In our study of the Brooks Range mountain belt in northern Alaska, we characterize low-temperature overgrowths on older zircon crystals that can provide excellent ages using the U-Pb radioactive decay scheme because of their closed system behavior with no loss of daughter products. In the case of the Brooks Range, these zircon overgrowths appear to have formed as enclosing rocks were uplifted toward the surface of the Earth. Their uplift coincided with formation of deep water marine basins and enhanced volcanic activity, which we interpret as due to southward rollback of the subduction zone beneath Alaska beginning~115 million years ago.

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Mesozoic rift to post-rift tectonostratigraphy of the Sverdrup Basin, Canadian Arctic

Cited by 51 publications

References 30 publications

Evidence for Late Triassic provenance areas and Early Jurassic sediment supply turnover in the Barents Sea Basin of northern Pangea

Evidence for Late Triassic provenance areas and Early Jurassic sediment supply turnover in the Barents Sea Basin of northern Pangea

Finding the VOICE: organic carbon isotope chemostratigraphy of Late Jurassic – Early Cretaceous Arctic Canada

Greenschist Facies Metamorphic Zircon Overgrowths as a Constraint on Exhumation of the Brooks Range Metamorphic Core, Alaska

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