Paleogeographic and tectonic implications of the first paleomagnetic results from the Middle–Late Cambrian Mesón Group: NW Argentina

Spagnuolo, Cecilia M.; Rapalini, Augusto E.; Astini, Ricardo A.

doi:10.1016/j.jsames.2007.08.004

Cited by 9 publications

(20 citation statements)

References 49 publications

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“…The supercontinent is reconstructed according to Lottes & Rowley (1990) in African coordinates. MCM1: Cerro Morado and Molles volcanics (this work), FS: Famatina System, PO: Eastern Puna, CY: Cuchillaco Granodiorite, FC: Campanario Formation (Spagnuolo et al 2007). (B) Geotectonic map with the main Precambrian and Palaeozoic terranes of South America (modified from Pankhurst et al .…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…2006, Rapalini 2005). (C) Location of the sampling localities of Early Palaeozoic rocks from NW Argentina with significant amounts of clockwise rotations (Conti et al 1996; Spagnuolo et al 2007; this work).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…The supercontinent is reconstructed according to Lottes & Rowley (1990) Pankhurst et al 2006, Rapalini 2005). (C) Location of the sampling localities of Early Palaeozoic rocks from NW Argentina with significant amounts of clockwise rotations (Conti et al 1996;Spagnuolo et al 2007; this work). denudation of the Famatina range in the study area as Cretaceous, compatible with similar data obtained by Coughlin et al (1998) in Valle Fértil, Maz, Umango, Famatina and Aconquija Ranges which could be related to a chemical or thermoviscous remagnetization of these rocks.…”

Section: N T E R P R E Tat I O N a N D Discussion Smentioning

confidence: 99%

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Palaeomagnetic confirmation of Palaeozoic clockwise rotation of the Famatina Ranges (NW Argentina): implications for the evolution of the SW margin of Gondwana

Spagnuolo

Rapalini

Astini

2008

Geophysical Journal International

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S U M M A R YPalaeomagnetic results from Palaeozoic volcanic and sedimentary units of the Famatina Ranges, in NW Argentina (28.7 • S, 67.8 • W) are reported. A late Early to late Middle Ordovician palaeomagnetic pole was obtained from a pre-tectonic remanence carried by magnetite and isolated in volcanics of the Molles Formation and the Cerro Morado Group (MCM1, 16.7 • S, 357.2 • E, A 95 = 6.5 • , K = 38.5, N = 14 sites). This pole position is rotated 39 • clockwise respect to the coeval reference pole for Gondwana but it is consistent with previous Early Ordovician poles from the Famatina belt and the Faja Eruptiva Oriental in the Puna region of NW Argentina. The sedimentary layers of the Molles Formation, however, present a secondary magnetization carried by hematite, which is interpreted of Permian age and yields a pole position (MCM2) at 78.7 • S, 330.8 • E (A 95 = 7.2 • , K = 16.1, n = 27 samples). Two additional independent palaeomagnetic poles were obtained from the Permian De La Cuesta Formation, exposed at two different localities in the same area. While one consisted in a exclusively reverse polarity magnetization and a pole position (LC1, 76.9 • S, 345.2 • E, A 95 = 6.0 • , K = 21.1, n = 29 samples) compatible with the late Early to early Late Permian palaeomagnetic poles from South America, the other presented only normal polarities and a pole position (LC2, 74.5 • N, 275.4 • E, A 95 = 2.0 • , K = 258.3, n = 21 samples) suggestive of a Cretaceous remagnetization.These new palaeomagnetic results confirm on a much more robust database previous proposals that the Ordovician rocks of the Famatina belt have undergone a large clockwise rotation. They also constrain the rotation to pre-Permian times. Different tectonic models involving the Late Ordovician docking of a large para-authochthonous terrane or a pattern of systematic large-scale rotations in the Early Palaeozoic continental margin of Western Gondwana are discussed.

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Section: Interpretation and Discussionmentioning

confidence: 99%

Section: Interpretation and Discussionmentioning

confidence: 99%

Section: N T E R P R E Tat I O N a N D Discussion Smentioning

confidence: 99%

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Palaeomagnetic confirmation of Palaeozoic clockwise rotation of the Famatina Ranges (NW Argentina): implications for the evolution of the SW margin of Gondwana

Spagnuolo

Rapalini

Astini

2008

Geophysical Journal International

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“…Differences in the zircon U‐Pb age spectra from the Tariquia Formation and Guandacay Formation indicate a provenance change from a western source or recycled sediments to one dominated by material from the Santa Victoria and Mesón Groups of the Eastern Cordillera. These units comprise the steep mountain front just west of the modern Subandean Zone and are exposed in the Zenta block ramp anticline (Allmendinger & Zapata, ; Spagnuolo et al, ; Starck & Schulz, ). We infer that motion along this thrust erected a topographic barrier west of the modern Subandes that blocked the eastward transfer of sediment from the west and focused erosion on the eastern slope of the rising topography (Figure ).…”

Section: Interpretations and Discussionmentioning

confidence: 99%

“…In northwestern Argentina, rocks of the Puncoviscana Formation, Mesón Group, and Santa Victoria Group are deformed into a large antiform as a fault‐bend fold over a footwall ramp (Starck & Schulz, ). A significant back thrust in the overturned limb of this fold has developed in weak Silurian shale, thrusting Ordovician and Cambrian rocks westward (Echavarria et al, ; Spagnuolo et al, ; Starck & Schulz, ). Late Miocene motion on steeply dipping structures in the southern Eastern Cordillera have uplifted the Zenta block and eastern Tilcara ranges, as documented by sedimentologic data from the Cianzo (Siks & Horton, ) and Humahuaca (Pingel et al, ) basins.…”

Section: Geologic Backgroundmentioning

confidence: 99%

Foreland Basin Record of Uplift and Exhumation of the Eastern Cordillera, Northwest Argentina

et al. 2018

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The style, tempo, and timing of orogenic plateaus such as the Altiplano‐Puna in South America are actively debated. Foreland basin strata in northwestern Argentina preserve a record of the eastward propagation, uplift, and erosion of the eastern margin of the high topography of the Puna plateau and Eastern Cordillera. Herein, we present new sedimentologic and geochronologic data from the Neogene foreland basin strata and modern fluvial sediments at 23°S to reveal the timing of growth and erosion of the modern plateau margin. Traditional sedimentologic approaches, including conglomeratic clast counts and sandstone point‐counts, combined with detrital zircon U‐Pb age distributions preserve robust signatures that track changes in sediment provenance over the past 12 Ma. Growth of the modern plateau edge commenced between 12 and 7 Ma and erected a topographic barrier that cut off the supply of sediment from more westerly sources. Erosion of this rising block has progressively dissected a cover of early Paleozoic sediments of the Mesón and Santa Victoria Groups, leading to deep incision into the pre‐Cambrian metasediments of the Puncoviscana Formation that continues today. Detrital apatite and zircon fission track data from the both the Neogene strata and modern streams document erosion of the frontal block at a rate of about 0.6 mm/a.

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Paleogeographic and Kinematic Constraints in the Tectonic Evolution of the Pre-Andean Basement Blocks

Rapalini

Geuna

Franceschinis

et al. 2018

The Evolution of the Chilean-Argentinean Andes

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Paleogeographic and tectonic implications of the first paleomagnetic results from the Middle–Late Cambrian Mesón Group: NW Argentina

Cited by 9 publications

References 49 publications

Palaeomagnetic confirmation of Palaeozoic clockwise rotation of the Famatina Ranges (NW Argentina): implications for the evolution of the SW margin of Gondwana

Palaeomagnetic confirmation of Palaeozoic clockwise rotation of the Famatina Ranges (NW Argentina): implications for the evolution of the SW margin of Gondwana

Foreland Basin Record of Uplift and Exhumation of the Eastern Cordillera, Northwest Argentina

Paleogeographic and Kinematic Constraints in the Tectonic Evolution of the Pre-Andean Basement Blocks

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