2026-06-07T15:17:53Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/61082024-07-17T17:06:32Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Larrovere, Mariano Alexis
author
de los Hoyos, Camilo R.
author
Willner, Arné
author
Verdecchia, Sebastián O.
author
Baldo, Edgardo G.
author
Casquet Martín, César
author
Basei, Miguel A.
author
Hollanda, Maria H.
author
Rocher, Sebastián
author
Alasino, Pablo H.
author
Moreno, Gabriel G.
2023-06-16T15:16:26Z
2023-06-16T15:16:26Z
2020
0016-7649, ESSN: 2041-479X
10.1144/jgs2018-230
https://hdl.handle.net/20.500.14352/6108
https://pubs.geoscienceworld.org/jgs/article-abstract/doi/10.1144/jgs2018-230/574546/Mid-crustal-deformation-in-a-continental-margin
New structural data from a mid-crustal segment in the Eastern Sierras Pampeanas, coupled with geochronological methods and P–T estimates, reveal polyphase contractional deformation and metamorphism during the Famatinian Orogeny over a long period of time. Peaks of metamorphic monazite and zircon ages are recorded at c. 500 Ma, between 484 and 465 Ma and at c. 440 Ma. Between 484 and 465 Ma the region attained high-temperature (HT) low-pressure (LP) conditions that resulted in widespread partial melting (peak at c. 470 Ma). A contractional phase occurred during this event, as suggested by syn-anatectic structures, as well as folding at subsolidus conditions. Renewed contraction under subsolidus conditions is evidenced by reverse ductile shearing and folding at c. 440 Ma. Thrusting along the La Chilca Shear Zone caused metamorphic inversion. The consistent orientation of folds in the Quebrada del Molle Metamorphic Complex, El Portezuelo Metamorphic–Igneous Complex and the La Chilca Shear Zone as well as WSW-directed thrusting at the later shear zone indicate uniform WSW–ENE-directed shortening. This late deformation records the Ocloyic tectonic phase and brought the Famatinian Orogeny to an end in the Late Ordovician to Early Silurian.
eng
Mid-crustal deformation in a continental margin orogen: structural evolution and timing of the Famatinian Orogeny, NW Argentina
journal article
URL
https://docta.ucm.es/bitstreams/bedabb93-20e6-430b-ae74-2698a70130d6/download
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MD5
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Mid-crustal deformation in a continental margin orogen.pdf
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https://docta.ucm.es/bitstreams/30cf7327-ba91-4bee-86db-f2dcf4a60919/download
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MD5
f0490e34c91469ebafb7e13cba3f16f4
140366
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Mid-crustal deformation in a continental margin orogen.pdf.txt