Pre‐Thrusting Stratigraphic Control on the Transition From a Thin‐Skinned to Thick‐Skinned Structural Style: An Example From the Double‐Decker Idaho‐Montana Fold‐Thrust Belt

Parker, Stuart D.; Pearson, David

doi:10.1029/2020tc006429

Cited by 15 publications

(27 citation statements)

References 167 publications

(421 reference statements)

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“…Hybrid models showing a combination of thick‐ and thin‐skinned deformation have been documented by for example, Giambiagi et al. (2008, 2009) and Parker and Pearson (2021). To study their application to the Tilcara Range and San Lucas block, more detailed structural mapping and modeling, especially of the Santa Victoria Group and its relationship to the overlying Salta Group, is needed.…”

Section: Discussionmentioning

confidence: 85%

“…At the same time, a deeper detachment may be responsible for crustal thickening and propagation of deformation into the Andean foreland, but might also be able to influence exhumation in shallower crustal levels. Hybrid models showing a combination of thick-and thin-skinned deformation have been documented by for example, Giambiagi et al (2008Giambiagi et al ( , 2009 and Parker and Pearson (2021). To study their application to the Tilcara Range and San Lucas block, more detailed structural mapping and modeling, especially of the Santa Victoria Group and its relationship to the overlying Salta Group, is needed.…”

Section: Structural Implicationsmentioning

confidence: 99%

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Constraining Andean Propagation of Exhumation at the Limit of the Eastern Cordillera, NW Argentina, Using Low‐Temperature Thermochronology in a Structural Context

et al. 2022

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Within the Central Andes of NW Argentina, the spatiotemporal distribution and style of deformation is strongly influenced by pre‐Cenozoic heterogeneities, mostly related to the Salta rift extension in the Cretaceous. At the enigmatic junction of the thin‐skinned Subandean belt and the thick‐skinned Santa Barbara System, the Tilcara Range and adjacent San Lucas block, located within the Eastern Cordillera, show thermochronological and field evidence of multiple exhumation events. Mesozoic (140‐115 Ma), pre‐Andean exhumation of basement highs is constrained by unconformities between basement and syn‐rift strata, as well as zircon (U‐Th‐Sm)/He cooling ages. Cenozoic Andean exhumation is quantified by apatite (U‐Th‐Sm)/He and fission track cooling ages, which were reset between the Late Cretaceous and Miocene. These data show that the westernmost Tilcara Range began exhuming in the late Oligocene‐early Miocene (26‐16 Ma), after which exhumation propagated to the border of the Eastern Cordillera in the middle Miocene (22‐10 Ma). The onset of rapid exhumation in the San Lucas block, which is located east of the Tilcara Range, occurred in the late Miocene (10‐8 Ma) in its western part, and in the late Miocene‐early Pliocene (6‐4 Ma) in its eastern part. Internal deformation of the San Lucas block, disturbing zircon (U‐Th‐Sm)/He and apatite fission track age patterns, predates propagation of rapid exhumation. The here presented low‐temperature thermochronology data set thus quantifies the multi‐phase exhumation history of the Eastern Cordillera of NW Argentina and constrains the timing of Andean propagation of exhumation within the Eastern Cordillera and the adjacent structural transition zone.

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Section: Discussionmentioning

confidence: 85%

Section: Structural Implicationsmentioning

confidence: 99%

Constraining Andean Propagation of Exhumation at the Limit of the Eastern Cordillera, NW Argentina, Using Low‐Temperature Thermochronology in a Structural Context

et al. 2022

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“…Basement involvement in thrust belts is well documented in regions with thin cover strata. In these settings, preexisting basement weaknesses such as the Valle Fértil suture may facilitate décollement activation at deeper crustal levels as required to attain critical taper (e.g., Allmendinger et al., 1983; Kley et al., 1999; Parker & Pearson, 2021; Pearson et al., 2013; Ramos et al., 2002).…”

Section: Discussionmentioning

confidence: 99%

Causes of Variable Shortening and Tectonic Subsidence During Changes in Subduction: Insights From Flexural Thermokinematic Modeling of the Neogene Southern Central Andes (28–30°S)

et al. 2022

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The Andes of western Argentina record spatiotemporal variations in morphology, basin geometry, and structural style that correspond with changes in crustal inheritance and convergent margin dynamics. Above the modern Pampean flat‐slab subduction segment (27–33°S), retroarc shortening generated a fold‐thrust belt and intraforeland basement uplifts that converge north of ∼29°S, providing opportunities to explore the effects of varied deformation and subduction regimes on synorogenic sedimentation. We integrate new detrital zircon U‐Pb and apatite (U‐Th)/He analyses with sequentially restored, flexurally balanced cross sections and thermokinematic models at ∼28.5–30°S to link deformation with resulting uplift, erosion, and basin accumulation histories. Tectonic subsidence, topographic evolution, and thermochronometric cooling records point to (a) shortening and distal foreland basin accumulation at ∼18–16 Ma, (b) thrust belt migration, changes in sediment provenance, and enhanced flexural subsidence from ∼16 to 9 Ma, (c) intraforeland basement deformation, local flexure, and drainage reorganization at ∼12–7 Ma, and (d) out‐of‐sequence shortening and exhumation of foreland basin fill by ∼8–2 Ma. Thrust belt kinematics and the reactivation of basement heterogeneities strongly controlled tectonic load configurations and subsidence patterns. Geo/thermochronological data and model results resolve increased shortening and combined thrust belt and intraforeland basement loading in response to ridge collision and Neogene shallowing of the subducted oceanic slab. Finally, this study demonstrates the utility of integrated flexural thermokinematic and erosion modeling for evaluating the geometries, rates, and potential drivers of retroarc deformation and foreland basin evolution during changes in subduction.

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“…The Idaho-Montana fold-thrust belt consists of two overlapping components (Kulik and Schmidt, 1988;Parker and Pearson, 2021): (1) an upper, Sevier-type thrust system that links the more inboard, western part of the thrust belt in central Idaho with similar thrusts in east-central Idaho and southwestern Montana (Fig. 1); and (2) a deeper thrust system that constitutes the Laramide belt of southwestern Montana but also projects beneath the shallower thrust system in east-central Idaho.…”

Section: ■ Background Tectonic Settingmentioning

confidence: 99%

Supplemental Material: Foreland basin response to middle Cretaceous thrust belt evolution, southwestern Montana, USA

Gardner¹,

al.²,

Finzel³

2022

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Pre‐Thrusting Stratigraphic Control on the Transition From a Thin‐Skinned to Thick‐Skinned Structural Style: An Example From the Double‐Decker Idaho‐Montana Fold‐Thrust Belt

Abstract: Continental fold-thrust belts are often modeled as wedges of deformed rock that structurally overlie and are detached from underlying basement rocks (e.g.

Cited by 15 publications

References 167 publications

Constraining Andean Propagation of Exhumation at the Limit of the Eastern Cordillera, NW Argentina, Using Low‐Temperature Thermochronology in a Structural Context

Constraining Andean Propagation of Exhumation at the Limit of the Eastern Cordillera, NW Argentina, Using Low‐Temperature Thermochronology in a Structural Context

Causes of Variable Shortening and Tectonic Subsidence During Changes in Subduction: Insights From Flexural Thermokinematic Modeling of the Neogene Southern Central Andes (28–30°S)

Supplemental Material: Foreland basin response to middle Cretaceous thrust belt evolution, southwestern Montana, USA

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