Tectonics and geology of spreading ridge subduction at the Chile Triple Junction: a synthesis of results from Leg 141 of the Ocean Drilling Program

1994 ◽  
Vol 83 (4) ◽  
Author(s):  
J.H. Behrmann ◽  
S.D. Lewis ◽  
S.C. Cande
Keyword(s):  
Triple Junction ◽  
Spreading Ridge ◽  
Ocean Drilling Program ◽  
Ridge Subduction ◽  
Ocean Drilling ◽  
Chile Triple Junction

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.

Magmatic–tectonic effects of high thermal regime at the site of active ridge subduction: the Chile Triple Junction model

2000 ◽  
Vol 326 (3-4) ◽  
pp. 255-268 ◽  
Author(s):  
Yves Lagabrielle ◽  
Christèle Guivel ◽  
René C. Maury ◽  
Jacques Bourgois ◽  
Serge Fourcade ◽  
...  
Keyword(s):  
Thermal Regime ◽  
Triple Junction ◽  
Ridge Subduction ◽  
Chile Triple Junction
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