scholarly journals Seismotectonic implications of the South Chile ridge subduction beneath the Patagonian Andes

Terra Nova ◽  
2021 ◽  
Author(s):  
Rodrigo Suárez ◽  
Christian Sue ◽  
Matías Ghiglione ◽  
Benjamin Guillaume ◽  
Miguel Ramos ◽  
...  
Keyword(s):  
The South ◽  
Ridge Subduction ◽  
Chile Ridge ◽  
Patagonian Andes

Timing and origin of deformation along the Patagonian fold and thrust belt

2000 ◽  
Vol 137 (4) ◽  
pp. 345-353 ◽  
Author(s):  
M. SUÁREZ ◽  
R. DE LA CRUZ ◽  
C. M. BELL
Keyword(s):  
Continental Margin ◽  
Foreland Basin ◽  
South American ◽  
Thrust Belt ◽  
The South ◽  
Plate Convergence ◽  
Ridge Subduction ◽  
Fold And Thrust Belt ◽  
Chile Ridge ◽  
Oceanic Plates

The Andean orogeny in the Patagonian Cordillera of southern South America reflects the consequences of the Mesozoic and Cenozoic subduction of an oceanic plate beneath the South American continental margin. The geological evolution of the region has been influenced by the Eocene collision and subduction of the Farallon–Aluk Ridge and the Miocene–Recent subduction of the Chile Ridge. Another aspect of plate interaction during this period was two intervals of rapid plate convergence, one at 50–42 Ma, and the other at 25–10 Ma, between the South American and the oceanic plates. It has been proposed that the collision of the Chile Ridge with the trench was responsible for the development, at least in part, of the Patagonian fold and thrust belt. This belt extends for more than 1000 km along the eastern foothills of the southern Andes between 46° and 54° S along the southwestern rim of the Austral Basin. The interpretation of a link between subduction of the ridge and formation of the fold and thrust belt is based on assumed time coincidences between contractional tectonism and the collision of ridge segments during Middle and Late Miocene times. The main Tertiary contractional events in the Patagonian fold and thrust belt took place during latest Cretaceous–Palaeocene–Eocene and during Miocene times. Although the timing of deformation is still poorly constrained, the evidence currently available suggests that there is little or no relationship between the timing of the fold and thrust belt and the collision of ridge segments. Most if not all of the contractional tectonism pre-dated the latest episodes of ridge collision. Collision of a ridge crest with the continental margin has been active for the past 14 to 15 million years. Contrary to the suggestion of a relationship between ridge subduction and compression, the main result of this collision has been fast uplift and extensional tectonism. The initiation of the Patagonian fold and thrust belt in latest Cretaceous or early Tertiary times coincided with a fundamental change in the tectonic evolution of the Austral Basin. Throughout the Cretaceous most of this basin subsided as a broad backarc continental shelf. Only in latest Cretaceous times, and coinciding with the initiation of the fold and thrust belt, the basin underwent a transition to a retro-arc foreland basin. This change to an asymmetrically subsiding foreland basin, with an associated foreland fold and thrust belt, was related to uplift of the Andean orogenic belt in the west.

scholarly journals Seismic noise tomography in the Chile ridge subduction region

2010 ◽  
Vol 182 (3) ◽  
pp. 1478-1492 ◽  
Author(s):  
A. Gallego ◽  
R. M. Russo ◽  
D. Comte ◽  
V. I. Mocanu ◽  
R. E. Murdie ◽  
...  
Keyword(s):  
Seismic Noise ◽  
Ridge Subduction ◽  
Chile Ridge

scholarly journals Southern Chile crustal structure from teleseismic receiver functions: Responses to ridge subduction and terrane assembly of Patagonia

Geosphere ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 378-391 ◽  
Author(s):  
E.E. Rodriguez ◽  
R.M. Russo
Keyword(s):  
Crustal Structure ◽  
Triple Junction ◽  
Oceanic Lithosphere ◽  
Receiver Functions ◽  
Moho Depth ◽  
The South ◽  
Ridge Subduction ◽  
The North ◽  
Tectonic Processes ◽  
Chile Triple Junction

Abstract Continental crustal structure is the product of those processes that operate typically during a long tectonic history. For the Patagonia composite terrane, these tectonic processes include its early Paleozoic accretion to the South America portion of Gondwana, Triassic rifting of Gondwana, and overriding of Pacific Basin oceanic lithosphere since the Mesozoic. To assess the crustal structure and glean insight into how these tectonic processes affected Patagonia, we combined data from two temporary seismic networks situated inboard of the Chile triple junction, with a combined total of 80 broadband seismic stations. Events suitable for analysis yielded 995 teleseismic receiver functions. We estimated crustal thicknesses using two methods, the H-k stacking method and common conversion point stacking. Crustal thicknesses vary between 30 and 55 km. The South American Moho lies at 28–35 km depth in forearc regions that have experienced ridge subduction, in contrast to crustal thicknesses ranging from 34 to 55 km beneath regions north of the Chile triple junction. Inboard, the prevailing Moho depth of ∼35 km shallows to ∼30 km along an E-W trend between 46.5°S and 47°S; we relate this structure to Paleozoic thrust emplacement of the Proterozoic Deseado Massif terrane above the thicker crust of the North Patagonian/Somún Cura terrane along a major south-dipping fault.

Neogene Patagonian magmatism between the rupture of the Farallon plate and the Chile Ridge subduction

2021 ◽  
pp. 103238
Author(s):  
Cristóbal Ramírez de Arellano ◽  
Mauricio Calderón ◽  
Huber Rivera ◽  
Mauricio Valenzuela ◽  
C. Mark Fanning ◽  
...  
Keyword(s):  
Ridge Subduction ◽  
Chile Ridge

scholarly journals Azimuthal anisotropy in the Chile Ridge subduction region retrieved from ambient noise

Lithosphere ◽  
2011 ◽  
Vol 3 (6) ◽  
pp. 393-400 ◽  
Author(s):  
A. Gallego ◽  
M.P. Panning ◽  
R.M. Russo ◽  
D. Comte ◽  
V.I. Mocanu ◽  
...  
Keyword(s):  
Ambient Noise ◽  
Azimuthal Anisotropy ◽  
Ridge Subduction ◽  
Chile Ridge

Source-side shear wave splitting and upper mantle flow in the Chile Ridge subduction region

Geology ◽  
2010 ◽  
Vol 38 (8) ◽  
pp. 707-710 ◽  
Author(s):  
R.M. Russo ◽  
A. Gallego ◽  
D. Comte ◽  
V.I. Mocanu ◽  
R.E. Murdie ◽  
...  
Keyword(s):  
Shear Wave ◽  
Upper Mantle ◽  
Shear Wave Splitting ◽  
Mantle Flow ◽  
Ridge Subduction ◽  
Wave Splitting ◽  
Chile Ridge
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