Kinematics of basement-involved compressive structures

Narr, Wayne; Suppe, John

doi:10.2475/ajs.294.7.802

Cited by 138 publications

(86 citation statements)

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“…Cover deformation mechanisms induced by a basement-involved structures can behave actively (e.g Wilcox et al 1973, Naylor et al 1986, Brink et al 1996, Erslev 1991, Narr & Suppe 1994, Erslev & Mayborn 1997, Tindall 2000 or passively (e.g Passchier 2001, Grasemann & Stüwe 2001, Exner et al 2004). …”

Section: Discussionmentioning

confidence: 99%

A structural model of the Fábrica Nova region, Santa Rita syncline, Quadrilátero Ferrífero: flanking folds as a folding mechanism

Rossi

Endo

2015

Rem: Rev. Esc. Minas

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This study focuses on the eastern flank of the Santa Rita syncline (Dorr 1969), with specific emphasis on the region known as Fábrica Nova. Important iron ore deposits are located on the flanks of this structure, such as Timbopeba, Alegria, São Luiz, Tamanduá, Almas and Fábrica Nova. The Santa Rita syncline is a fold with N-S axial direction and of subregional scale, with roots in the adjacent basement of the Santa Bárbara Complex and sectioned by the Água Quente thrust fault. The hypothesis of this study is that the structural framework of the region resulted from the superposition of at least three deformation phases on the Ouro Preto nappe. The Fábrica Nova mine, located in the central portion of the study area, is embedded in a synformal structure with a 100/20 trending axis named Fábrica Nova synform. The proposed model to explain the particular structural geometry of this region is based on the flanking folding mechanism (Passchier 2001). This mechanism may have been developed by E-W crustal shortening during the F4 tectonic deformation phase.

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Section: Discussionmentioning

confidence: 99%

A structural model of the Fábrica Nova region, Santa Rita syncline, Quadrilátero Ferrífero: flanking folds as a folding mechanism

Rossi

Endo

2015

Rem: Rev. Esc. Minas

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“…By folding and crosscutting earlier detachments, they triggered the uplift of the Quetame Massif and adjacent basement blocks. In the Guavio foothills, the detachment at the base of the Chipaque black shales might have been coeval, accommodating changes in length associated with folding and with protrusion of basement blocks into the cover (Narr and Suppe, 1994).…”

Section: Balanced Cross-section and Structural Interpretationmentioning

confidence: 99%

Andean deformation and rift inversion, eastern edge of Cordillera Oriental (Guateque–Medina area), Colombia

Branquet

Cheilletz

Cobbold

et al. 2002

Journal of South American Earth Sciences

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In the Guateque-Medina area, Paleozoic basement and Mesozoic rift basins have been uplifted and exhumed during the Andean orogeny (12 Ma to present). Surface exposures and subsurface data constrain the deformation style and the rift geometry. We have mapped a regional transect and restored a cross section. We have also reconciled existing stratigraphic data, from cordillera, foothills and foreland basin, and have added new data of our own. In Early Cretaceous shales, there is evidence for fault-controlled sedimentation. A brecciated evaporitic layer, which is locally emerald bearing, has acted as a regional detachment. The underlying basement, composed of Paleozoic sediments, crops out as the Quetame Massif. It was uplifted during the Andean orogeny on a series of high-angle reverse faults. The main SE-verging Tesalia fault has resulted from Andean reactivation of an Early Cretaceous normal fault, which bounded a half-rift. A series of NW-verging back-thrusts may have resulted from Andean reactivation of Paleozoic faults. Between the back-thrusts and the Tesalia fault is a basement pop-up. It may be part of a flower structure, because components of right-lateral slip have been identified. These are attributed to eastward subduction of the Nazca plate beneath South America. In general, the style and timing of Andean deformation in the Guateque-Medina area are compatible with the plate tectonic setting of the northern Andes.

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“…Thus the straight limbs and sharp hinges of the Narr and Suppe (1994) and Mitra and Mount (1998) constructions most closely correlate with the theoretical fold form that occurs in a hghly anisotropic sedimentary cover. teams (1978) documented that some folds in the Rocky Mountain foreland are characterized by sedimentary bedding that is thinned in the steep forelimb (e.g.…”

Section: Comparison With Trishear and Parallel Kink Descriptionsmentioning

confidence: 78%

“…s.=3 so that the medium deforms more easily in shear than in compression. The forelimb falls within a narrower rectangular region with uniform bed dips, much like the idealized parallel kink folds of Narr and Suppe (1994) (Fig. 1B) and the idealized, "cover-detached folds" of Mitra and Mount (1998) (Fig.…”

Section: Comparison With Trishear and Parallel Kink Descriptionsmentioning

confidence: 99%

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Mechanical Models of Fault-Related Folding

Johnson¹

2003

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Kinematics of basement-involved compressive structures

Cited by 138 publications

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A structural model of the Fábrica Nova region, Santa Rita syncline, Quadrilátero Ferrífero: flanking folds as a folding mechanism

A structural model of the Fábrica Nova region, Santa Rita syncline, Quadrilátero Ferrífero: flanking folds as a folding mechanism

Andean deformation and rift inversion, eastern edge of Cordillera Oriental (Guateque–Medina area), Colombia

Mechanical Models of Fault-Related Folding

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