TY - JOUR
T1 - Paleozoic-early Mesozoic structural evolution of the West Gondwana accretionary margin in southern Patagonia, Argentina
AU - Suárez, Rodrigo
AU - Ghiglione, Matías C.
AU - Sue, Christian
AU - Quezada, Paulo
AU - Roy, Sandrine
AU - Rojo, Diego
AU - Calderón, Mauricio
N1 - Funding Information:
This work has been carried out in the frame of the Argentinian-French ECOS-SUD project A15U02 (C. S., and M. G.), and thanks to the financial support of grants projects from Agencia PICT-2013-1291 directed by M.G., French projects SYSTER ( CNRS-INSU ) directed by C.S. The authors are grateful to Administración de Parques Nacionales for granting access to Patagonian National Parks, and Pedro and Ivonne from the La Lila Farm for hospitality. RS is grateful to Pablo González for technical assistance for developing fieldwork. Discussions with Gerson Greco, Raúl Giacosa, Lucia Sagripanti, Miguel Ramos, and Santiago González, drove to improve this article. Thanks to Dr. Cesar Navarrete and Dr. Eber Cristofolini for constructive and positive reviews and Dr. Sebastian Oriolo by editorial handling.
Publisher Copyright:
© 2020 Elsevier Ltd
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/3
Y1 - 2021/3
N2 - The Upper Devonian-Upper Triassic low-grade metasedimentary rocks exposed along the South Patagonian Andes preserve the structural record of deformation associated with pre-Andean orogenic phases that predated the inception of the Jurassic rift during Gondwana fragmentation. Through the structural analysis at different scales, we identified deformation structures mainly with cratonward vergence, produced at two stages of structure development for the Bahía de la Lancha (early Carboniferous) and Río Lácteo (Middle Devonian-early Carboniferous) formations, and in a single one, for the Nunatak Viedma Unit (Late Triassic). The structural features were integrated with available U–Pb detrital zircon ages and fission-track cooling ages from those units. It leads us to identify a westward younging of sedimentation (i.e. protolith deposition) and widening of the continental margin throughout Paleozoic-early Mesozoic times, tectonically stabilized during the late Carboniferous-middle Permian Gondwanide orogeny and the Late Triassic-Early Jurassic Chonide orogeny. The structural style holds features of fold-and-thrust belts, which is discussed in a context of accretionary tectonics inherent to the Terra Australis exterior orogen.
AB - The Upper Devonian-Upper Triassic low-grade metasedimentary rocks exposed along the South Patagonian Andes preserve the structural record of deformation associated with pre-Andean orogenic phases that predated the inception of the Jurassic rift during Gondwana fragmentation. Through the structural analysis at different scales, we identified deformation structures mainly with cratonward vergence, produced at two stages of structure development for the Bahía de la Lancha (early Carboniferous) and Río Lácteo (Middle Devonian-early Carboniferous) formations, and in a single one, for the Nunatak Viedma Unit (Late Triassic). The structural features were integrated with available U–Pb detrital zircon ages and fission-track cooling ages from those units. It leads us to identify a westward younging of sedimentation (i.e. protolith deposition) and widening of the continental margin throughout Paleozoic-early Mesozoic times, tectonically stabilized during the late Carboniferous-middle Permian Gondwanide orogeny and the Late Triassic-Early Jurassic Chonide orogeny. The structural style holds features of fold-and-thrust belts, which is discussed in a context of accretionary tectonics inherent to the Terra Australis exterior orogen.
KW - Accretionary orogenesis
KW - Chonide orogeny
KW - Fold-and-thrust belts
KW - Gondwanide orogeny
KW - Metasedimentary rocks
KW - South Patagonian Andes
KW - Stages of structure development
UR - http://www.scopus.com/inward/record.url?scp=85097468685&partnerID=8YFLogxK
U2 - 10.1016/j.jsames.2020.103062
DO - 10.1016/j.jsames.2020.103062
M3 - Article
AN - SCOPUS:85097468685
VL - 106
JO - Journal of South American Earth Sciences
JF - Journal of South American Earth Sciences
SN - 0895-9811
M1 - 103062
ER -