Lower Proterozoic arc–microcontinent collisional tectonics in the western Churchill Province

Lewry, John F.

doi:10.1038/294069a0

Cited by 104 publications

(35 citation statements)

References 16 publications

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“…In 1977,1979, and 1981 The collision of continental fragments during Hudsonian orogeny with the line of collision under the Williston basin, was suggested by Lewry, (1981) and by Green et al (1985). The very thick crust under the Williston basin most probably results from this tectonic event, when the crustal thickness was doubled before being eroded to present level .…”

Section: Crustal Structurementioning

confidence: 99%

Subsidence et regime thermique des bassins intracratoniques et des marges continentales passives =

Podkhlebnik¹

1992

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Section: Crustal Structurementioning

confidence: 99%

Subsidence et regime thermique des bassins intracratoniques et des marges continentales passives =

Podkhlebnik¹

1992

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“…The Glennie Lake domain was described by Lewry (1981) as dominantly composed of "early quartz dioritic to granodioritic orthogneisses later foliated to undeformed dioritic to granitic plutons" with subordinate supracrustal rocks in the form of "narrow arcuate belts within the orthogneiss," which he noted were continuous with similar supracrustals in the adjacent LaRonge-Lynn Lake belt to the northwest. The domain was thought to represent an Archean microcontinental block, caught within the Hudsonian orogeny (Lewry, 1981;Green and others, 1985;Lewry and others, 1985), but recent isotopic studies suggest that the domain formed between 1850 and 1900 Ma ago (J.F.…”

Section: Glennie Lake Domainmentioning

confidence: 99%

“…The domain was thought to represent an Archean microcontinental block, caught within the Hudsonian orogeny (Lewry, 1981;Green and others, 1985;Lewry and others, 1985), but recent isotopic studies suggest that the domain formed between 1850 and 1900 Ma ago (J.F. Lewry, oral communication, 1985).…”

Section: Glennie Lake Domainmentioning

confidence: 99%

“…Recent studies (Lewry andSibbald, 1978, 1980;Stauffer, 1984;Lewry and others, 1985;and Green and others, 1985) described the component terranes of the Trans-Hudson orogenic belt and proposed genetic models. They described (figs.…”

Section: Geology Of the Trans-hudson Orogenic Beltmentioning

confidence: 99%

“…The batholith was described by Lewry (1981) as a "Hudsonian 'Cordilleran-type' arc massif." Figure I.…”

Section: Wathaman-chipewyan Batholithmentioning

confidence: 99%

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Southern extension of the Churchill Province (Trans-Hudson orogenic belt) Midcontinent Strategic and Critical Minerals Project, 1985 workshop report

Anderson¹

1987

Open-File Report

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Crustal structure of the Bighorn Mountains region: Precambrian influence on Laramide shortening and uplift in north‐central Wyoming

et al. 2016

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The crustal structure of north-central Wyoming records a history of complex lithospheric evolution from Precambrian accretion to Cretaceous-Paleogene Laramide shortening. We present two active source P wave velocity model profiles collected as part of the Bighorn Arch Seismic Experiment in 2010. Analyses of these velocity models and single-fold reflection data, together with potential field modeling of regional gravity and magnetic signals, constrain crustal structure and thickness of the Bighorn region. We image a west dipping reflection boundary and model a sharp magnetic contact east of the Bighorn Arch that together may delineate a previously undetected Precambrian suture zone. Localized patches of a high-velocity, high-density lower crustal layer (the "7.× layer") occur across the study area but are largely absent beneath the Bighorn Arch culmination. Moho topography is relatively smooth with no large-scale offsets, with depths ranging from~50 to 37 km, and is largely decoupled from Laramide basement topography. These observations suggest that (1) the edge of the Archean Wyoming craton lies just east of the Bighorn Mountains, approximately 300 km west of previous interpretations, and (2) Laramide deformation localized in an area with thin or absent 7.× layer, due to its relatively weak lower crust, leading to detachment faulting. Our findings show that Precambrian tectonics in northern Wyoming may be more complicated than previously determined and subsequent Laramide deformation may have been critically dependent on laterally heterogeneous crustal structure that can be linked to Precambrian origins.The potential role of Archean (>2.5 Ga) and Proterozoic (0.541-2.5 Ga) structures in the development of the Laramide orogeny (~75 Ma to~40 Ma) has been suggested by numerous studies that note contrasting structural patterns in the southern and northern Rocky Mountain provinces [Brown, 1993;Erslev and Koenig, 2009;Stone, 1986]. Deformation, probably driven by flat-slab subduction [e.g., Bird, 1988;Coney and Reynolds, 1977;Dickinson and Snyder, 1978], led to basement-involved thick-skinned shortening during the Laramide orogeny (~75 Ma to~40 Ma) [Dickinson et al., 1988], forming basement-cored foreland arches. In the Proterozoic basement of Colorado, Laramide arches typically strike north-northwest, are separated by narrow basins, and form a well-defined, en echelon deformation front on their eastern margin. In the large Archean basement of Wyoming, Laramide structures exhibit a larger variety of strikes and are separated by wide basins, with no well-defined deformation front. These contrasting geometries of thick-skinned deformation have been attributed to the greater diversity of structural fabrics in the Archean Wyoming basement [Brown, 1993;Erslev and Koenig, 2009] and different crustal architectures. Most notably, the high-velocity, high-density lower crustal WORTHINGTON ET AL.CRUSTAL STRUCTURE OF THE BIGHORN ARCH 208

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Lower Proterozoic arc–microcontinent collisional tectonics in the western Churchill Province

Cited by 104 publications

References 16 publications

Subsidence et regime thermique des bassins intracratoniques et des marges continentales passives =

Subsidence et regime thermique des bassins intracratoniques et des marges continentales passives =

Southern extension of the Churchill Province (Trans-Hudson orogenic belt) Midcontinent Strategic and Critical Minerals Project, 1985 workshop report

Crustal structure of the Bighorn Mountains region: Precambrian influence on Laramide shortening and uplift in north‐central Wyoming

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