Proterozoic cuspate basement-cover structure, Needle Mountains, Colorado

Harris, Charles; Gibson, Richard G.; Simpson, Carol; Eriksson, Kenneth A.

doi:10.1130/0091-7613(1987)15<950:pcbsnm>2.0.co;2

Cited by 24 publications

(16 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on overprinting relationships documented in several studies (Karlstrom, 1999;Ilg et al, 1996), we infer that structures evolved from premetamorphic low-angle thrusts (now preserved only in the lowest grade blocks; e.g., Mazatzal block; Doe and Karlstrom, 1991), to ductile thrust belts (such as the Needle Mountains in Colorado and the Manzano Moun-tains in New Mexico). At somewhat deeper levels (10 km, 3 kbar) in areas such as the Needle Mountains (Harris et al, 1987), early thrusts and recumbent folds are overprinted by penetrative northeast-trending subvertical foliation and shear zones that record northwest-southeast horizontal shortening and general shear and represent the dominant orogenic fabric in much of the southwestern United States…”

Section: Trans-hudson Orogen: Reworked Archean Crust With Belts Of 1mentioning

confidence: 99%

Untitled

2007

View full text Add to dashboard Cite

This paper presents a plate-scale model for the Precambrian growth and evolution of the North American continent. The core of the North American continent (Canadian shield) came together in the Paleoproterozoic (2.0-1.8 Ga) by plate collisions of Archean continents (Slave with Rae-Hearne, then Rae-Hearne with Superior) as well as smaller Archean continental fragments (Wyoming, Medicine Hat, Sask, Marshfi eld, Nain cratons). The resulting Trans-Hudson orogen was a collisional belt similar in scale to the modern Himalayas. It contains mainly reworked Archean crust, but remnants of juvenile volcanic belts are preserved between Archean masses. The thick, buoyant, and compositionally depleted mantle lithosphere that now underlies North America, although dominantly of Archean age, took its present shape by processes of collisional orogenesis and likely has a scale of mantle heterogeneity similar to that exhibited in the overlying crust.In marked contrast, lithosphere of southern North America (much of the conti nental United States) was built by progressive addition of a series of dominantly juvenile vol canic arcs and oceanic terranes accreted along a long-lived southern (present coordinates) plate margin. Early juvenile additions ( Pembine-Wausau, Elves Chasm arcs) formed at the same time (1.84-1.82 Ga) the core was assembling. Following fi nal assembly of the Archean and Paleoproterozoic core of North America by 1.8 Ga, major accretionary provinces (defi ned mainly by isotopic model ages) were added by arc-continent accretion, analogous to present-day convergence between Australia and Indonesia. Also similar to Indonesia, some accreted terranes contain older continental crustal material [Archean(?) Mojavia], but the extent and geometry of older crust are not well known. Accretion-ary provinces are composed of numerous 10 to 100 km scale terranes or blocks, separated by shear zones, some of which had compound histories as terrane sutures and later crustalassembly structures. Major northeast-trending provinces are the Yavapai province (1.80-1.70 Ga), welded to North America during the 1.71-1.68 Ga Yavapai orogeny; the Mazatzal province (1.70-1.65 Ga), added during the 1.65-1.60 Ga Mazatzal orogeny; the Granite-Rhyolite province (1.50-1.30 Ga), added during the 1.45-1.30 Ga tectonic event associated with A-type intracratonic magmatism; and the Llano-Grenville province (1.30-1.00 Ga), added during the 1.30-0.95 Ga broader Grenville orogeny. During each episode of addition of juvenile lithosphere, the transformation of juvenile crust into stable continental lithosphere was facilitated by voluminous granitoid plutonism that stitched new and existing orogenic boundaries. Slab roll back created transient extensional basins (1.70 and 1.65 Ga) in which Paleoproterozoic quartziterhyolite successions were deposited, then thrust imbricated as basins were inverted.The lithospheric collage that formed from dominantly juvenile terrane accretion and stabilization (1.8-1.0 Ga) makes up about half of the present-day North American con...

show abstract

Section: Trans-hudson Orogen: Reworked Archean Crust With Belts Of 1mentioning

confidence: 99%

Untitled

2007

View full text Add to dashboard Cite

show abstract

“…Nevertheless, in some basins we see major deformations in the cover which is not represented in the basement. Basementcover relationships (Harris et al, 1987;Gibbons, 1989;James and Mortensen, 1992;Marquer and Burkhard, 1992;Narr and Suppe, 1994;Teixcell, 1996;Muñoz et al, 2002), may therefore indicate 'thick-skinned' tectonics (Coward, 1983;Butler et al, 2004;Pfiffner, 2006) when basement is involved or 'thin-skinned' tectonics (Gwinn, 1964;Cook et al, 1979;Kokkalas et al, 2013) when there is a detachment separating basement units from a postdetachment cover. Thin skinned deformation styles are diverse and include such types as (a) nappes riding over a rather undeformed subsurface along plane well lubricated thrust faults (e.g.…”

Section: Introductionmentioning

confidence: 97%

Basement–cover structural relationships in the Kaladgi Basin, southwestern India: Indications towards a Mesoproterozoic gravity gliding of the cover along a detached unconformity

Mukherjee

Das

Modak

2016

Precambrian Research

View full text Add to dashboard Cite

“…At the interface between the cover and basement, infolding can produce a cuspate-lobate geometry (Harris et al 1987;Ross et al 1985;Kisters and Anhaeusser 1995) similar to mullions (Ramsay 1967;Urai et al 2001;Krayenbuhl and Steck 2009). Cuspate-lobate structures observed in models are consistent with observations of Ramsay (1967) for their significant viscosity contrast between layers.…”

Section: Infolding Versus Ductile Substrate Flowmentioning

confidence: 97%

“…In some cases, however, the superstructure may be infolded into the infrastructure (e.g. Harris et al 1987;Chen 1998;Aspler et al 2002).…”

Section: Aimsmentioning

confidence: 98%

“…Infolding of the layered sequence into the ductile substrate produced in some models is reminiscent of cover-basement or superstructure-infrastructure infolding during regional shortening in the Needle Mountains of Colorado (Harris et al 1987), the Canadian Cordillera (Ross et al 1985), Archaean greenstone belts in South Africa (Kisters and Anhaeusser 1995), and in the central Hearne domain of the Trans-Hudson orogen (Aspler et al 2002). At the interface between the cover and basement, infolding can produce a cuspate-lobate geometry (Harris et al 1987;Ross et al 1985;Kisters and Anhaeusser 1995) similar to mullions (Ramsay 1967;Urai et al 2001;Krayenbuhl and Steck 2009).…”

Section: Infolding Versus Ductile Substrate Flowmentioning

confidence: 99%

See 1 more Smart Citation

Centrifuge modelling of deformation of a multi-layered sequence over a ductile substrate: 1. Style and 4D geometry of active cover folds during layer-parallel shortening

Yakymchuk

Harris

Godin

2011

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

Centrifuge analogue modelling illustrates the progressive development of active folds in multilayers upon a ductile substrate during layer-parallel shortening. Models simulate folding of a mechanically stratified sedimentary sequence upon migmatitic gneisses in a large hot orogen, or upon a thick basal evaporite ± shale sequence in deeper levels of fold belts. The absence of a weak lowviscosity and low-density layer at the interface promotes infolding of the cover sequence and ductile substrate, whereas a planar upper surface to the basal ductile substrate is preserved when it is present. Whilst fold style, wavelength, and deformation of the interface with the ductile substrate differ depending on whether a low-viscosity and low-density layer is present at the base of the cover sequence, there is no marked systematic curvature of fold axes as seen in previous sandbox models for faultbend or fault propagation folding during bulk shortening. Bulk shortening of a layered sequence with relatively thick individual layers above a ductile substrate promotes a regular and upright train of buckle folds, whereas thinner layers promote a more irregular distribution of buckle folds with variable vergence, style, and amplitude. Buckle folds above a ductile substrate progressively develop during bulk shortening from open and upright, to angular and tight, and may further develop into cuspate structures above relatively weak horizons. Relatively thick weak horizons within the layered sequence during bulk shortening interrupt regular fold patterns up structural section and allow out-of-phase folds to develop above and below the weak horizon.

show abstract

Proterozoic cuspate basement-cover structure, Needle Mountains, Colorado

Cited by 24 publications

References 0 publications

Untitled

Untitled

Basement–cover structural relationships in the Kaladgi Basin, southwestern India: Indications towards a Mesoproterozoic gravity gliding of the cover along a detached unconformity

Centrifuge modelling of deformation of a multi-layered sequence over a ductile substrate: 1. Style and 4D geometry of active cover folds during layer-parallel shortening

Contact Info

Product

Resources

About