A review about the mechanisms associated with active deformation, regional uplift and subsidence in southern South America

Folguera, Andrés; Gianni, Guido M.; Sagripanti, Lucía; Vera, Emilio Rojas; Novara, Iván; Colavitto, Bruno; Álvarez, Orlando; Orts, Darío; Tobal, Jonathan; Giménez, Mario; Introcaso, Antonio; Ruíz, Francisco; Martínez, Patricia; Ramos, Víctor A.

doi:10.1016/j.jsames.2015.07.007

Cited by 34 publications

(11 citation statements)

References 105 publications

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“…In particular, the described anomalous geometry of the Miocene magmatism over the present retroarc zone, following a NE trend, and its chemistry for the 17-15 Ma magmatic period, could indicate the presence of an asthenospheric anomaly at the beginning of the Payenia shallow subduction zone (see Folguera et al, 2015).…”

Section: Accepted Manuscriptmentioning

confidence: 97%

Exhumation of the Neuquén Basin in the southern Central Andes (Malargüe fold and thrust belt) from field data and low-temperature thermochronology

Folguera

Bottesi²,

Duddy³

et al. 2015

Journal of South American Earth Sciences

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Section: Accepted Manuscriptmentioning

confidence: 97%

Exhumation of the Neuquén Basin in the southern Central Andes (Malargüe fold and thrust belt) from field data and low-temperature thermochronology

Folguera

Bottesi²,

Duddy³

et al. 2015

Journal of South American Earth Sciences

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“…In most forearc regions, geomorphic and seismic observations indicate a heterogenous pattern of low‐magnitude neotectonic deformation involving shortening along the western Andean slope (inner forearc) but focused extension along the Pacific coast (outer forearc) (Adam & Reuther, ; Allmendinger & González, ; Hall et al, ; Veloza et al, ). In the southern Andes, conflicting evidence of Quaternary retroarc contractional versus extensional deformation at 35–40°S (Cobbold & Rossello, ; Folguera et al, , ; Guzmán et al, ; Huyghe et al, ; Messager et al, ; Tapia et al, ) along with sparse stress data farther south in Patagonia are possible manifestations of relatively neutral to low‐stress conditions with negligible net strain (e.g., Cobbold et al, ; Folguera, Gianni, et al, ; Marotta et al, ).…”

Section: Geologic Backgroundmentioning

confidence: 99%

“…Substantial along‐strike disparities among the northern, central, and southern Andes are reflected by differences in shortening magnitude, shortening style, crustal thickening, lithospheric architecture, exhumation, and basin evolution (Beck & Zandt, ; Folguera, Gianni, et al, ; Giambiagi et al, ; Horton, ; Kley et al, ; Montgomery et al, ; Ramos, ; Ramos et al, ; Whitman et al, ). For example, extreme crustal shortening appears to have been confined to the axis of the central Andes at 15–25°S (including the “Bolivian orocline”; Gephart, ; Isacks, ; Kley & Monaldi, ; McQuarrie, ), with accompanying episodic or cyclical removal of thickened orogenic roots (DeCelles et al, , ).…”

Section: Introductionmentioning

confidence: 99%

Tectonic Regimes of the Central and Southern Andes: Responses to Variations in Plate Coupling During Subduction

2018

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Construction of the Andes has been governed largely by fluctuating contractional, neutral, and extensional tectonic regimes during differing degrees of mechanical coupling along the convergent plate boundary. These three contrasting regimes are likely regulated by geodynamic variations in absolute trenchward motion of South America and episodic regional shifts in the geometry of the subducting oceanic slab. Alternations among these three modes are revealed in syntheses of Mesozoic‐Cenozoic crustal deformation, basin evolution, and arc magmatism along orogen‐perpendicular transects across the central and southern Andes at 23°S, 35°S, and 43°S. Despite considerable along‐strike dissimilarities in the magnitude of deformation, a comparable tectonic regime typified the early Andean history, as defined by a transition from Late Jurassic‐Early Cretaceous postrift thermal subsidence to Late Cretaceous retroarc shortening. A key contradiction is expressed for the late middle Eocene to earliest Miocene, when neutral to extensional conditions affected retroarc to forearc regions, except in parts of the central Andes, which experienced retroarc shortening with only localized forearc extension. This mixed‐mode scenario during Paleogene time may reflect decoupling along the plate boundary (possibly during slab rollback within a retreating subduction system) in which widespread stasis or low‐magnitude extension dominated the southern Andes but was inhibited in the strongly shortened central Andes at 15–25°S where shallow subduction and/or high topography boosted plate coupling. Comparable temporal and spatial shifts in tectonic regime along the Andes and other convergent margins can be related to variable degrees of coupling during first‐order plate‐scale changes in convergence and second‐order regional cycles of slab shallowing and steepening.

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“…4). Complex and different mechanisms of uplift and active deformation in the southern Andes have been described for the last 5 Myr from the Altiplano region to Patagonia (Folguera & Ramos, 2011;Folguera & al., 2015). This changing relief and also species movements along altitudinal gradients in response to climate change due to glacial and interglacial periods may have played an important role in Calyceraceae evolution and diversification in that period.…”

Section: Version Of Recordmentioning

confidence: 99%

Insights into the phylogeny and evolutionary history of Calyceraceae

Denham

Zavala-Gallo

Johnson

et al. 2016

TAXON

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Calyceraceae is a small family with six traditionally recognized genera and 47 species from southern South America. Most species grow along the Andes (of both Argentina and Chile) and in arid regions of the Patagonian steppe. This family belongs to the well‐supported MGCA clade within Asterales, which includes Menyanthaceae+Goodeniaceae+Calyceraceae+ Asteraceae. Calyceraceae is monophyletic and sister to Asteraceae, one of the five largest families of angiosperms. Although Calyceraceae is clearly distinct as a family, its genera are not, and taxonomic revisionary effort has confirmed the lack of sharp boundaries among genera. We performed a phylogenetic analysis of Calyceraceae with a broad taxon sampling (41 of 47 species), and with sequence data from multiple regions from the nuclear (ITS) and plastid genomes (ycg6‐psbM, psbM‐trnD, trnS‐trnG, trnH‐psbA, trnD‐trnT) using maximum parsimony and Bayesian approaches. We aimed at identifying monophylectic groups, their putative morphological synapomorphies and their geographical distribution; we also estimated divergence times and examined chromosomes numbers in an evolutionary context. We obtained well‐resolved and strongly supported phylogenies that show Calyceraceae to be divided into two major clades with geographically structured subclades within each. Our results indicate that an early split within Calyceraceae occurred about 27.4 Ma, probably related to differential changes in chromosome numbers, which allowed the two lineages to evolve in sympatry. We found that major natural subgroups diverged 15–12 Ma, following the Early‐Miocene South Andes construction stage. Finally, the diversification of the extant species is probably associated to Andean orogeny and climate changes in the last 5–4 Myr. We recovered Acicarpha as monophyletic, while the remaining traditionally recognized genera of Calyceraceae are para‐ or polyphyletic. Most species of Moschopis are included in the Glutinose group, but M. monocephala is more closely related to some Calycera species. Calycera is divided into two clades; the Calycera group and the Pilose group. All species of Nastanthus are placed in a well‐supported main group with species of Gamocarpha and Boopis. Gamocarpha could be monophyletic after exclusion of G. dentata and G. angustifolia, but is nested within Nastanthus and Boopis species. Boopis is clearly polyphyletic with its species distributed in all main groups.

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A review about the mechanisms associated with active deformation, regional uplift and subsidence in southern South America

Cited by 34 publications

References 105 publications

Exhumation of the Neuquén Basin in the southern Central Andes (Malargüe fold and thrust belt) from field data and low-temperature thermochronology

Exhumation of the Neuquén Basin in the southern Central Andes (Malargüe fold and thrust belt) from field data and low-temperature thermochronology

Tectonic Regimes of the Central and Southern Andes: Responses to Variations in Plate Coupling During Subduction

Insights into the phylogeny and evolutionary history of Calyceraceae

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