Neogene to Quaternary tectonic evolution of the Patagonian Andes at the latitude of the Chile Triple Junction

Lagabrielle, Yves; Suárez, Manuel; Rossello, Eduardo A.; Hérail, Gérard; Martinod, Joseph; Régnier, Marc; Cruz, Rita De La

doi:10.1016/j.tecto.2004.04.023

Cited by 112 publications

(146 citation statements)

References 52 publications

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“…Seismicity demonstrates that it is active [Lange et al, 2008;Mora et al, 2010], but GPS coverage seems to be too sparse to define a rate. Lagabrielle et al [2004] argued that crustal shortening ended in Miocene time, perhaps earlier than Melnick et al [2006a] inferred for a part of the Chilean Andes farther north, but they contend that the range rose only in the past 3 Ma, which Lagabrielle et al [2007] ascribed to the insertion of a hot upper mantle beneath the region when the Chile Ridge passed to the north. Lagabrielle et al [2007] and Scalabrino et al [2010] demonstrated recent and active normal faulting, if on steep faults and perhaps not with rapid slip, and accordingly, we assume the same as for the region to the north, 0 AE 2 mm/yr.…”

Section: à42mentioning

confidence: 98%

Tectonics, climate, and mountain topography

et al. 2012

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[1] By regressing simple, independent variables that describe climate and tectonic processes against measures of topography and relief of 69 mountain ranges worldwide, we quantify the relative importance of these processes in shaping observed landscapes. Climate variables include latitude (as a surrogate for mean annual temperature and insolation, but most importantly for the likelihood of glaciation) and mean annual precipitation. To quantify tectonics we use shortening rates across each range. As a measure of topography, we use mean and maximum elevations and relief calculated over different length scales. We show that the combination of climate (negative correlation) and tectonics (positive correlation) explain substantial fractions (>25%, but <50%) of mean and maximum elevations of mountain ranges, but that shortening rates account for smaller portions, <25%, of the variance in most measures of topography and relief (i.e., with low correlations and large scatter). Relief is insensitive to mean annual precipitation, but does depend on latitude, especially for relief calculated over small ($1 km) length scales, which we infer to reflect the importance of glacial erosion. Larger-scale (averaged over length scales of $10 km) relief, however, correlates positively with tectonic shortening rate. Moreover, the ratio between small-scale and large-scale relief, as well as the relative relief (the relief normalized by the mean elevation of the region) varies most strongly with latitude (strong positive correlation). Therefore, the location of a mountain range on Earth with its corresponding climatic conditions, not just tectonic forcing, appears to be a key factor in determining its shape and size. In any case, the combination of tectonics and climate, as quantified here, can account for approximately half of the variance in these measures of topography. The failure of present-day shortening rates to account for more than 25% of most measures of relief raises the question: Is active tectonics overrated in attempts to account for present-day relief and exhumation rates of high terrain?

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Section: à42mentioning

confidence: 98%

Tectonics, climate, and mountain topography

et al. 2012

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“…Additionally, this interpretation is supported by the synchronous acceleration of exhumation rates across the Patagonian Andes (Thomson et al, 2001), estimated to have occurred between 17-14.24 Ma by Blisniuk et al (2006), and between 22-18 Ma by Fosdick et al (2013) in the retro-foreland region. The dynamic Oligocene-Miocene tectonic configuration of the Patagonian Andes generated by: 1. changes in the subduction velocity, convergence rate, and obliquity of the Nazca and South American plates (Pardo-Casas and Molnar, 1987); and 2. an increase in compression and shortening related to the collision of an unstable oceanic spreading center (quadruple junction) at 18-17 Ma (Breitsprecher and Thorkelson, 2009;Eagles et al, 2009), followed by the subduction and northward migration of the Chile Ridge (Cande and Leslie, 1986;Lagabrielle et al, 2004), seem to be the primary factors triggering the uplift, concomitant widening and foreland propagation of the fold-and-thrust belt during Early Miocene times (Ramos and Ghiglione, 2008). The resulting effects of these remarkable geological processes on the past configuration of the ecosystems and biogeographic patterns of the austral biota are the subjects of our present and future investigations in Aysén and Magallanes.…”

Section: Discussionmentioning

confidence: 99%

Depósitos burdigalianos de la Formación Santa Cruz en Sierra Baguales, Cuenca Austral (Magallanes): Edad, ambiente de deposición y vertebrados fósiles.

Bostelmann

Roux²,

Vasquez

et al. 2013

Andgeo

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“…The effects of triple junction migration and ridge subduction are also recorded in the Chilean backarc region in association with passage of the slab window (zone where no subducted plate below overriding plate owing to ridge subduction affected by upwelling asthenosphere). These include magmatism, compressional tectonics, and uplift (Lagabrielle et al, 2004). Lastly, the triple junction is associated with a very young (< 2 My), uplifted ophiolite that is likely the product of a complex series of triple junctions (TTF, TTR) that formed when a series of alternating short ridge and transform segments at the Antarctic and Nazca plate boundary intersected with the Chile Trench (Forsythe and Prior, 1992).…”

Section: Triple Junctionsmentioning

confidence: 99%

Sedimentation at Plate Boundaries in Transition

Marsaglia

2011

Tectonics of Sedimentary Basins

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From inception to termination convergent margins are dynamic regions. Subduction initiation is poorly understood with arguments for both induced and spontaneous processes. Geodynamic models help to predict the sedimentary-volcanic records of such events, but there are few areas where these models have been tested, particularly pre-Cenozoic examples. Where subduction is induced, the sedimentary signatures should include evidence for rapid uplift (unconformity), then rapid subsidence (finingand deepening-upward succession), followed by building of the arc edifice. Where subduction is spontaneous, the proto-forearc experiences subsidence and early magmatism prior to development of the magmatic arc. Once initiated, there are other opportunities for tectonic overprinting of the forearc owing to the formation and migration of plate triple junctions. There are several well-studied modern to Cenozoic examples that suggest differing signatures depending on the plate configuration. In the case of a triple junction involving purely subduction (trench-trench-trench) the overriding signature is associated with arc terrane accretion, whereas the interaction of a spreading ridge at a trench-ridge-trench triple junction can result in anomalous neartrench magmatism, thermal overprinting of the forearc, and subduction erosion. In triple-junction cases where subduction is superceded by transform plate motion (e.g., trench-fault-fault) the transition is marked by progressive uplift and deformation of the forearc concomitant with cessation of arc magmatism. The demise of a convergent margin can be through simple abandonment and subsidence, or transition to a transform plate margin, or where a spreading ridge is involved, result in deformation, uplift, and thermal/volcanic overprinting of the forearc prior to abandonment.

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Neogene to Quaternary tectonic evolution of the Patagonian Andes at the latitude of the Chile Triple Junction

Cited by 112 publications

References 52 publications

Tectonics, climate, and mountain topography

Tectonics, climate, and mountain topography

Depósitos burdigalianos de la Formación Santa Cruz en Sierra Baguales, Cuenca Austral (Magallanes): Edad, ambiente de deposición y vertebrados fósiles.

Sedimentation at Plate Boundaries in Transition

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