Relations between hinterland and foreland shortening: Sevier orogeny, central North American Cordillera

Taylor, Wanda J.; Bartley, John M.; Martin, Mark W.; Geissman, J. W.; Walker, J. Douglas; Armstrong, Phillip A.; Fryxell, Joan E.

doi:10.1029/1999tc001141

Cited by 69 publications

(120 citation statements)

References 67 publications

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“…Maximum total shortening across the central Nevada thrust belt is 10-15 km (Taylor et al, 1993(Taylor et al, , 2000DeCelles, 2004), similar to that documented here for the Confusion Range segment of the western Utah thrust belt.…”

Section: Western Utah Thrust Beltsupporting

confidence: 79%

“…The central Nevada thrust belt is exposed for 250 km along strike in south-central Nevada, and correlation with structures as far north as the Adobe Range extends the strike length to greater than 400 km (Taylor et al, 2000). Maximum total shortening across the central Nevada thrust belt is 10-15 km (Taylor et al, 1993(Taylor et al, , 2000DeCelles, 2004), similar to that documented here for the Confusion Range segment of the western Utah thrust belt.…”

Section: Western Utah Thrust Beltsupporting

confidence: 65%

“…( on June 2, 2015 geosphere.gsapubs.org Downloaded from the Upper Cambrian strata (Taylor et al, 1993(Taylor et al, , 2000. The Canyon Range thrust, on the west side of the Canyon Range in central Utah, is interpreted to place Proterozoic Pocatello Formation on Upper Cambrian strata (DeCelles and Coogan, 2006), indicating local detachment in the Upper Cambrian section.…”

Section: Lower Paleozoic Mechanical Stratigraphymentioning

confidence: 96%

“…The western Utah thrust belt is comparable in size and structural style to the central Nevada thrust belt, located 175 km to the west in eastcentral Nevada (Fryxell, 1988;Speed et al, 1988;Taylor et al, 1993Taylor et al, , 2000DeCelles, 2004;Long, 2012). The central Nevada thrust belt is a narrow, generally north-striking zone of thrust faults and related folds that involve rocks as young as Permian.…”

Section: Western Utah Thrust Beltmentioning

confidence: 96%

“…The central Nevada thrust belt is a narrow, generally north-striking zone of thrust faults and related folds that involve rocks as young as Permian. Timing constraints are minimal, but deformation was probably active between Late Jurassic and Middle Cretaceous time (Taylor et al, 1993(Taylor et al, , 2000DeCelles, 2004).…”

Section: Western Utah Thrust Beltmentioning

confidence: 97%

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The Confusion Range, west-central Utah: Fold-thrust deformation and a western Utah thrust belt in the Sevier hinterland

Greene

2014

Geosphere

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The Confusion Range in west-central Utah has been considered a broad structural trough or synclinorium with little overall shortening. However, new structural studies indicate that the Confusion Range is more accurately characterized as an east-vergent, fold-thrust system with ~10 km of horizontal shortening during Late Jurassic to Eocene Cordilleran contractional deformation. For this study, four balanced and retrodeformable cross sections across the Confusion Range and adjacent Tule Valley were constructed using existing mapping and new fi eld data, and these were tied with a fi fth strike-parallel section. Ramp anticlines and anticlinal duplexes characteristic of strong Lower Paleozoic carbonate units are balanced by faulted and rotated detachment folds in more ductile Upper Paleozoic strata. The apparently synclinal aspect results from two different sets of thrust structures that uplift and expose Lower Paleozoic rocks on the fl anks of the range. Fold-thrust structures are continuous southward for more than 130 km, forming a thrust belt of regional extent herein named the western Utah thrust belt. This thrust belt is comparable in length and magnitude of shortening to the central Nevada thrust belt, and both merge southward with the Sevier frontal thrust belt. Together, these and related fold-thrust zones in eastern Nevada indicate signifi cant, broadly distributed Mesozoic shortening in the Sevier hinterland. The Cordilleran thrust belt in eastern Nevada and western Utah thus consists of a frontal zonethe Sevier frontal thrust belt-where major thrust faults with 50-100 km of displacement breach the surface, and a hinterland zone, characterized by a number of distributed fold-thrust belts, each accommodating on the order of 10 km of shortening.

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Section: Western Utah Thrust Beltsupporting

confidence: 79%

Section: Western Utah Thrust Beltsupporting

confidence: 65%

Section: Lower Paleozoic Mechanical Stratigraphymentioning

confidence: 96%

Section: Western Utah Thrust Beltmentioning

confidence: 96%

Section: Western Utah Thrust Beltmentioning

confidence: 97%

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The Confusion Range, west-central Utah: Fold-thrust deformation and a western Utah thrust belt in the Sevier hinterland

Greene

2014

Geosphere

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Zircon and apatite (U-Th)/He evidence for Paleogene and Neogene extension in the Southern Snake Range, Nevada, USA

et al. 2015

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Despite decades of study, the timing, rates, and magnitude of extension in the Basin and Range are poorly quantified in some areas. This study integrates new zircon and apatite (U-Th)/He analyses (ZrnHe and ApHe) with published thermochronologic data to quantify these extensional parameters in the Southern Snake Range (SSR) of east-central Nevada. The new ZrnHe dates range from 40.7 ± 4.9 Ma in the western SSR to 21.0 ± 3.3 Ma near the present-day trace of the Southern Snake Range Décollement (SSRD), and the ApHe dates range from 15.1 ± 2.4 Ma in the central SSR to 13.6 ± 0.7 Ma closest to the SSRD trace. These new and previously published low-temperature thermochronologic cooling ages were inverted for the extensional history of the SSR using a Bayesian Monte Carlo method incorporating Pecube. The posterior extensional histories indicate three significant pulses of extension occurred during the Paleogene and Neogene: (1)~50-45 to~38 Ma (Eocene), (2)~33-30 to~23 Ma (Oligocene), and (3)~23-20 to~10-8 Ma (Miocene). Modeled rates of extension were low at ≤ 0.5 mm a À1 ; however, more rapid rates possibly occurred during the Eocene and the Miocene based on posterior histories. Net cumulative extension from posterior histories is 19.8 to 34.9 km, with a mean of 29.7 km. About 10-18 km of extension occurred during the Eocene and Oligocene. Model results indicate no relationship between extension and magmatism in the SSR. Our new model results and interpretations also indicate extensional collapse of the Nevadaplano initiated prior to~17 Ma.

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Geometry and kinematics of the Grant Range brittle detachment system, eastern Nevada, U.S.A.: An end‐member style of upper crustal extension

Long

Walker²

2015

Tectonics

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Documenting the range of styles of normal faulting is fundamental to understanding crustal extension. Here geologic mapping, field relationships, and deformed and restored cross sections illustrate the geometry and kinematic development of a system of west-vergent detachment faults in the Grant Range in eastern Nevada. Faults exhibit brecciation and stratigraphic cutoff angles of 5-15°at all structural levels and deform a 10 km thick section of Paleozoic and Paleogene rocks. The fault system is folded across an anticlinal culmination, which grew during extension, as indicated by progressively increasing interlimb angles and incision in the axial zone. The eastern limb consists of an imbricate stack of faults that were emplaced from bottom to top. In the western limb, several faults exhibit apparent thrust relationships. The oldest faults are cut by a~29 Ma dike, and the highest preserved fault cuts~32 Ma volcanic rocks that restore to paleodepths of~1 km. Retrodeformation of folding and minimal structural relief and angularity across a Paleogene unconformity indicate the faults were active at 5-15°angles. Retrodeformation of offset indicates ≥49 km (98%) extension. We propose a model of stationary, sustained isostatic uplift and incision at the culmination axis (a "fixed hinge"), with updip excision producing bottom-to-top growth of the imbricate stack and downdip excision producing apparent thrust relationships. The fault system exhibits similarities to core complex detachment systems, though it is confined to upper crustal levels, and there are no preserved high-angle or listric normal faults, indicating a unique extension style dominated by low-angle excision.

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Relations between hinterland and foreland shortening: Sevier orogeny, central North American Cordillera

Abstract: Abstract.The tectonic relations between foreland and hinterland deformation in noncollisional orogens are critical to understanding the overall development of orogens.

Cited by 69 publications

References 67 publications

The Confusion Range, west-central Utah: Fold-thrust deformation and a western Utah thrust belt in the Sevier hinterland

The Confusion Range, west-central Utah: Fold-thrust deformation and a western Utah thrust belt in the Sevier hinterland

Zircon and apatite (U-Th)/He evidence for Paleogene and Neogene extension in the Southern Snake Range, Nevada, USA

Geometry and kinematics of the Grant Range brittle detachment system, eastern Nevada, U.S.A.: An end‐member style of upper crustal extension

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