Neoproterozoic of the Mackenzie Mountains, northwestern Canada

Narbonne, Guy M.; Aitken, J D

doi:10.1016/0301-9268(94)00073-z

Cited by 140 publications

(103 citation statements)

References 57 publications

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“…The most comprehensive studies have been performed on thick carbonate successions in South Australia (e.g. McKirdy et al, 2001;Giddings and Wallace 2009a, b;Rose et al, 2012;Hood & Wallace, 2014, 2015Wallace et al, 2015) and Namibia (Halverson et al, 2002(Halverson et al, , 2005Hoffman and Schrag, 2002;Hurtgen et al, 2002;Hoffman and Halverson, 2008;Hoffman, 2011), and mixed carbonate-siliciclastic sediments of NW Canada (Hofmann et al, 1990;Narbonne and Aitken, 1995;Day et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

The Late Cryogenian Warm Interval, NE Svalbard: Chemostratigraphy and genesis

Fairchild

Bonnand²,

Davies

et al. 2016

Precambrian Research

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms At the base of E3, interstratification of cap carbonate with ice-rafted and redeposited glacial sediments occurs. Early diagenetic stabilization of carbonate mineralogy from a precursor, possibly ikaite, to calcite or dolomite is inferred. E3 is predominantly dolomitic silt-shale, with sub-millimetre lamination, lacking sand or current-related sedimentary structures. Thin fine laminae are partly pyritized and interpreted as microbial mats. Dolomite content is 25-50%, with δ 13 C values consistently around +4‰, a value attributed to buffering by dissolution of a precursor metastable carbonate phase. Local calcite cement associates with low δ 13 C values. The carbonates form silt-sized, chemically zoned rhombic crystals from an environment with dynamically changing Fe and Mn. Three-dimensional reconstructions of cm-scale disturbance structures indicate that they represent horizontally directed sock-like folds, developed by release of overpressure into thin surficial sediment overlying an early-cemented layer.A shoaling upwards unit near the top of E3 displays calcium sulphate pseudomorphs in dolomite in the north, but storm-dominated limestones in the south, both being overlain by peritidal oolitic dolomites, exposed under the succeeding Wilsonbreen glacial deposits. There is no Trezona δ 13 C anomaly, possibly implying top-truncation of the succession.Regular 0.5 m-scale sedimentary rhythms, reflecting subtle variations in sediment texture or composition occur throughout E3 and are interpreted as allocyclic. They are thought to be mainly primary in origin, locally modified slightly during early diagenetic cementation. Rhythms are proposed to represent ca. 18 kyr precession cycles, implying 6-8 Myr deposition between glaciations.

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Section: Introductionmentioning

confidence: 99%

The Late Cryogenian Warm Interval, NE Svalbard: Chemostratigraphy and genesis

Fairchild

Bonnand²,

Davies

et al. 2016

Precambrian Research

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“…Glacial deposits of the Ice Brook Formation and prograding cyclic shallow-water clastic-carbonate units of the underlying Keele Formation are interpreted to represent the global Marinoan glaciation and associated postglacial melting (James et al, 2001). The stratigraphic framework and depositional history of the post-Ice Brook Formation succession (Sheepbed to Risky Formations) is well established (Aitken, 1989(Aitken, , 1991aNarbonne and Aitken, 1995;Dalrymple and Narbonne, 1996;MacNaughton et al, 2000). The top of the Windermere Supergroup is marked by a prominent unconformity and the Precambrian-Cambrian boundary occurs within the strata of the overlying Ingta Formation (Aitken, 1989;MacNaughton and Narbonne, 1999).…”

Section: Mackenzie Mountainsmentioning

confidence: 99%

“…During most of the late Neoproterozoic, the shelf trended from northwest to southeast and the shelf edge prograded southwestward from neritic environments in the eastern Mackenzies to continental slope settings in the western Mackenzies (Fig. 2 of Narbonne and Aitken, 1995;Dalrymple and Narbonne, 1996).…”

Section: Mackenzie Mountainsmentioning

confidence: 99%

“…The upper, post-rift succession of the Windermere Supergroup is siliciclastic-dominated, but contains cyclic alternations of carbonates with terrigenous clastics, referred to as Grand Cycles (Aitken, 1989). The dominantly deep-water succession of the Windermere Supergroup is well known in the Mackenzie Mountains (Aitken, 1989;Narbonne and Aitken, 1995) where it contains a superb record of Ediacaran megafossils of three distinct assemblages and an excellent chemostratigraphic record (Narbonne et al, 1994;Kaufman et al, 1997;James et al, 2001). The sedimentology and sequence stratigraphy is well understood for the Mackenzie Mountains succession (Dalrymple and Narbonne, 1996;MacNaughton et al, 2000) but the development of sequence boundaries in the deeper-water setting is muted and this hinders development of a sequence-stratigraphic framework for this succession.…”

Section: Introductionmentioning

confidence: 99%

“…The Wernecke Mountains succession contains Ediacaran fossils (Narbonne and Hofmann, 1987), and carbonates that are amenable to isotope chemostratigraphy. The Aitken, 1989;Narbonne and Aitken, 1995;Fig. 4).…”

Section: Introductionmentioning

confidence: 99%

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Integrated Ediacaran chronostratigraphy, Wernecke Mountains, northwestern Canada

Pyle

Narbonne

James

et al. 2004

Precambrian Research

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Terminal Neoproterozoic (Ediacaran, ca. 600-543 Ma) strata of the upper part of the Windermere Supergroup are well-exposed in the Mackenzie Mountains and the Wernecke Mountains of northwestern Canada. Windermere strata in the Mackenzie Mountains contain an exceptional Ediacaran biostratigraphic and isotopic (C and Sr) record, while the sequence stratigraphic record is subtle throughout this predominantly deep-water succession. Coeval strata in the Wernecke Mountains can be correlated with the succession in the Mackenzie Mountains on a formational level. In contrast to the deep-water setting of the Mackenzies succession, the Werneckes succession preserves a predominantly shallow-water succession amenable to detailed sequence stratigraphy. Integrated lithostratigraphy, chemostratigraphy, biostratigraphy and sedimentology partitions the Wernecke Mountains succession into five depositional sequences and constrains correlation with strata in the Mackenzie Mountains. The siliciclastic and carbonate sediments, deposited along the margin of the proto-Pacific Ocean, record accumulation in continental slope, neritic, and terrestrial paleoenvironments. Distinctive temporal chemostratigraphic and biostratigraphic attributes allow these strata to be correlated with other Ediacaran successions worldwide. Integrating sequence stratigraphy with these attributes is a robust, yet under-utilized correlation tool and is a step toward erecting a more detailed working Neoproterozoic chronostratigraphy.

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Zircon (U‐Th)/He thermochronology of Neoproterozoic strata from the Mackenzie Mountains, Canada: Implications for the Phanerozoic exhumation and deformation history of the northern Canadian Cordillera

et al. 2016

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Sedimentary strata of the Neoproterozoic Mackenzie Mountains Supergroup (MMSG) and Windermere Supergroup (WSG) occupy the cores of anticlines in the Mackenzie Mountains of the Canadian Cordilleran Foreland Belt. Stratigraphic and structural evidence suggest that these rocks have undergone several episodes of burial and unroofing relatively intact. We report single‐grain detrital muscovite 40Ar/39Ar and zircon (U‐Th)/He (ZHe) data from a suite of samples across the fold‐thrust belt and the Neoproterozoic stratigraphic record. The strata have not reached high enough temperatures to reset the muscovite 40Ar/39Ar system, and instead our detrital muscovite data refine Tonian‐Cryogenian depositional ages. Single‐crystal ZHe dates range from 432 ± 35 to 46 ± 4 Ma, indicating that MMSG and WSG strata have not been heated sufficiently to fully reset the ZHe system. These factors make the Neoproterozoic strata an attractive natural laboratory to test the utility of the zircon radiation damage and annealing model on the quantification of thermal histories from detrital zircon populations that have accumulated radiation damage over long geologic timescales. Thermal modeling reveals that (1) a substantial sedimentary package was deposited following the Devonian and removed during Permo‐Triassic cooling, and (2) the Cordilleran deformation front propagated through the study area from the Albian to the Paleocene, with a moderate increase in cooling rates between 75–67 Ma in the southwest and 60–55 Ma at the deformation front. Ultimately, relationships between radiation damage and helium diffusion kinetics in zircon explain substantial ZHe date dispersion and elucidate the temperature‐time history of the northern Canadian Cordillera.

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Neoproterozoic of the Mackenzie Mountains, northwestern Canada

Cited by 140 publications

References 57 publications

The Late Cryogenian Warm Interval, NE Svalbard: Chemostratigraphy and genesis

The Late Cryogenian Warm Interval, NE Svalbard: Chemostratigraphy and genesis

Integrated Ediacaran chronostratigraphy, Wernecke Mountains, northwestern Canada

Zircon (U‐Th)/He thermochronology of Neoproterozoic strata from the Mackenzie Mountains, Canada: Implications for the Phanerozoic exhumation and deformation history of the northern Canadian Cordillera

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