Consolidation of the American Cordilleras

Coney, Peter J.; Evenchick, C A

doi:10.1016/0895-9811(94)90011-6

Cited by 86 publications

(51 citation statements)

References 59 publications

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“…Tectonic setting Jurassic-Cretaceous subduction on the western margin of North America caused magmatism and metamorphism near the plate boundary and displacement and shortening associated with eastward-directed thrusting of the sedimentary cover rocks, on the foreland side (Armstrong 1968;Coney et al 1980;Coney and Evenchick 1994;Eguiluz de Antuñano et al 2000;DeCelles 2004;DeCelles et al 2009, Barth et al 2012. The topography related with the contraction of these rocks, since modified by subsequent tectonic processes and erosion, is regionally expressed in the Rocky Mountains Fold-Thrust Belt (RMFTB) and in the Sierra Madre Oriental or MFTB further south ( Figure 1).…”

Section: Geological Frameworkmentioning

confidence: 99%

“…(1) they preserve information on tectonic interaction at convergent margins (Coney 1973;Campa-Uranga 1983;Coney and Evenchick 1994); (2) their evolution is often associated with co-genetic oil migration and the formation of ore deposits at a regional scale (McQuarrie 2004;Cooper 2007) and (3) their elevation can affect atmospheric moisture circulation and precipitation (Bookhagen et al 2005;Poulsen and Jeffery 2011;Campani et al 2012). The study of the Mexican FoldThrust Belt (MFTB) in this article utilizes results from the development of a novel method of dating deformation by using folds and shear zones exposed across strike, along an ENE-WSW cross-section of the belt.…”

Section: Introductionmentioning

confidence: 96%

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Progressive, episodic deformation in the Mexican Fold–Thrust Belt (central Mexico): evidence from isotopic dating of folds and faults

Fitz-Díaz

Hudleston

Tolson

et al. 2014

International Geology Review

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We used illite Ar/Ar dating to obtain absolute ages of folds and shear zones formed within the Mexican Fold-Thrust Belt (MFTB). The methodology takes advantage of illite dating in folded, clay-bearing layers and the ability to obtain accurate ages from small-size fractions of illite using encapsulated Ar analysis. We applied our approach to a cross-section that involves folded Aptian-Cenomanian shale-bentonitic layers interbedded with carbonates of the Zimapán (ZB) and Tampico-Misantla (TMB) Cretaceous basins in central-eastern Mexico. Basinal carbonates were buried by syn-tectonic turbidites and inverted during the formation of the MFTB in the Late Cretaceous. Results from folds and shear zones record different pulses of deformation within this thin-skinned orogenic wedge.Mineralogical compositions, variations in illite polytypes, illite crystallite size (CS), and Ar/Ar ages were obtained from several size fractions in limbs and hinges of the folds and in the shear zones. 1M d -illite polytype (with CS of 6-9 nm) dominates in two folds in the TMB while 2M 1 -illlite (with CS of 14-30 nm) dominates in the third fold, in the ZB, and in the fold/shear zone. From west (higher grade) to east (lower grade): Ar retention ages indicate shearing occurred at~84 Ma in the westernmost shear zone, folding at~82 Ma in the ZB with subsequent localized shearing at~77 Ma, and Ar total gas ages constrain the time of folding at~64 Ma on the west side of the TMB and~44 Ma on the eastern edge. These results are consistent with the age and distribution of syn-tectonic turbidites and indicate episodic progression of deformation from west to east.

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Section: Geological Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Progressive, episodic deformation in the Mexican Fold–Thrust Belt (central Mexico): evidence from isotopic dating of folds and faults

Fitz-Díaz

Hudleston

Tolson

et al. 2014

International Geology Review

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“…Although overprinted by Cenozoic shortening, reconstructions suggest neutral to tensile stress during the Mesozoic (Dalziel, 1981;Mpodozis and Ramos, 1989;Salfity and Marquillas, 1994;Cooper et al, 1995). Absolute westward motion of South America commenced with rifting from Africa in the late Early Cretaceous (Coney and Evenchick, 1994), but substantial compression and mountain building was delayed until Cenozoic time.…”

Section: Tectonic Settingmentioning

confidence: 99%

Cenozoic Evolution of Hinterland Basins in the Andes and Tibet

Horton

2011

Tectonics of Sedimentary Basins

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Sedimentary basins have been generated in hinterland regions of the Andean and Himalayan-Tibetan orogens during Cenozoic plate convergence. These hinterland basins record nonmarine sediment accumulation (commonly in high-elevation, lowrelief, internally drained, arid/semiarid settings) during protracted deformation and surface uplift of continental crust. In South America, Andean hinterland basins are produced between the western magmatic arc and craton-directed fold-thrust belt to the east. In the India-Asia collision zone, hinterland basins develop as elements of the growing Tibetan plateau between the Himalayan thrust belt and Asian plate interior to the north. Hinterland sedimentary basins in the Andes and Tibet are distinguished from foreland basins adjacent to their respective fold-thrust belts by structural position, elevation, and stratigraphic evolution. Sediment accommodation in these hinterland basins is created by flexure, fault-induced subsidence, and topographic ponding, with common examples of remnant foreland basins succeeded by younger hinterland basins.

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“…Protracted Late Triassic-Middle Jurassic plate convergence, punctuated by collisions of island arcs with the continental margin (e.g., Schweickert and Cowan, 1975;Dorsey and LaMaskin, 2007;Dickinson, 2008), was followed by a westward step of the plate margin during initiation of Franciscan subduction and the Late Jurassic to early Cenozoic Andean-style (noncollisional) Cordilleran orogen (Burchfi el et al, 1992;Coney and Evenchick, 1994;DeCelles, 2004). The response within the retroarc to the tectonic reorganization in the forearc remains poorly understood.…”

Section: Introductionmentioning

confidence: 99%

“…Cretaceous shortening in the retroarc Sevier fold-thrust belt and its hinterland, broadly contemporaneous with the Cretaceous development of the Franciscan accretionary complex, Great Valley forearc basin, and Sierran magmatic arc (e.g., Cowan and Bruhn, 1992) (Fig. 1), is commonly attributed to strong coupling between the eastwardunderfl owing Farallon plate and the westwardmoving North America plate (e.g., Burchfi el et al, 1992;Coney and Evenchick, 1994). In contrast, Early to Middle Jurassic retroarc shortening (e.g., Wyld, 2002;Dunne and Walker, 2004) may have been driven by arc collision and/or accretion (e.g., Dorsey and LaMaskin, 2007).…”

Section: Introductionmentioning

confidence: 99%

Jurassic Barrovian metamorphism in a western U.S. Cordilleran metamorphic core complex, Funeral Mountains, California

Hoisch

Wells

Beyene

et al. 2014

Geology

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Large-magnitude retroarc shortening of Cretaceous age is well documented in the Sevier orogenic belt of the western United States, and has been associated with eastward Franciscan subduction that began in the Middle-Late Jurassic, but evidence for major Late Jurassic retroarc shortening has been lacking. Here we report new Lu-Hf garnet geochronology, pressuretemperature (P-T) paths, and 40 Ar/ 39 Ar thermochronology data that document tectonic burial of Late Jurassic age in a Barrovian metamorphic terrain, the Funeral Mountains metamorphic core complex, California, located in the hinterland of the Sevier orogenic belt. The P-T paths determined from growth-zoned garnets in upper greenschist facies pelitic schist show steep P-T trajectories consistent with metamorphism during thrust loading. The age of thrust loading is constrained by a fi ve-point Lu-Hf garnet isochron to be 158.2 ± 2.6 Ma (2σ). Partial exhumation, recorded in 146-153 Ma 40 Ar/ 39 Ar muscovite cooling ages, closely followed garnet growth. Late Jurassic Barrovian metamorphism has not been previously recognized in Cordilleran metamorphic core complexes, possibly due to being obscured by Late Cretaceous to Tertiary deformation, magmatism, and metamorphism. This study fi nds that the period of large-magnitude crustal shortening in the retroarc extended into the Late Jurassic, and may have closely followed the formation of the coherent orogenic system associated with east-dipping Franciscan subduction.

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Consolidation of the American Cordilleras

Cited by 86 publications

References 59 publications

Progressive, episodic deformation in the Mexican Fold–Thrust Belt (central Mexico): evidence from isotopic dating of folds and faults

Progressive, episodic deformation in the Mexican Fold–Thrust Belt (central Mexico): evidence from isotopic dating of folds and faults

Cenozoic Evolution of Hinterland Basins in the Andes and Tibet

Jurassic Barrovian metamorphism in a western U.S. Cordilleran metamorphic core complex, Funeral Mountains, California

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