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dc.contributor.author
Encinas, Alfonso  
dc.contributor.author
Rosselot, Eduardo Agustín  
dc.contributor.author
Sagripanti, Lucía  
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Folguera Telichevsky, Andres  
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Horton, Brian K.  
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Orts, Darío Leandro  
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Valencia, Victor A.  
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Arriagada, Gabriel  
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Butikofer, Paz  
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Solórzano, Andrés  
dc.date.available
2025-07-30T11:53:36Z  
dc.date.issued
2024-04  
dc.identifier.citation
Encinas, Alfonso; Rosselot, Eduardo Agustín; Sagripanti, Lucía; Folguera Telichevsky, Andres; Horton, Brian K.; et al.; Cenozoic Basin Evolution During Alternating Extension and Shortening in the Southern Central Andes Along the Chile-Argentina Border, 37–38°S; Amer Journal Science; American Journal of Science; 324; 4-2024; 1-44  
dc.identifier.issn
0002-9599  
dc.identifier.uri
http://hdl.handle.net/11336/267485  
dc.description.abstract
The south-central Chile and Argentina margin experienced a regional phase of extensional tectonics during the Oligocene–early Miocene, forming several basins across the forearc, Andean Cordillera, and retroarc regions. These basins accumulated thick successions of volcanic and sedimentary rocks. Subsequently, Neogene contractional tectonics led to the development of the current Andean Cordillera and the deposition of synorogenic clastic deposits in foreland basins. Traditionally, the Cura Mallín Formation, comprising a lower volcanic unit (CMV) and an upper sedimentary unit (CMS), has been interpreted to have formed during the Oligocene–early Miocene extensional phase. However, some studies propose deposition of the CMS in a foreland basin during the early–late Miocene. To unravel the transition from extensional to contractional tectonics in the Andes of south-central Chile and Argentina, we conducted new geochronological analyses (U-Pb, LA-ICP-MS) and integrated these results with structural, stratigraphic, and sedimentological observations in key sections within the CMS and the overlying Trapa-Trapa Formation in the Principal Cordillera along the Chile-Argentina border (37°–38°S). Our findings indicate that only the lower part of the CMS was deposited in an extensional setting, as evidenced by the presence of an inverted extensional wedge dated at ∼20 Ma. The middle-upper CMS (∼19 to 9 Ma) and contemporaneous units to the east exhibit evidence of syncontractional deformation, suggesting deposition in a foreland basin generated by shortening of the western Principal Cordillera. Around 9 Ma, uplift of the Agrio and Chos Malal fold and thrust belts, east of the Principal Cordillera, led to segmentation of the foreland basin. The Trapa Trapa Formation was deposited in a hinterland basin, with sediment sourced from the east. After ∼6.5 Ma, major contractional deformation shifted westward, resulting in intense folding of the CMS and Trapa Trapa Formation and subsequent thrusting of the western Principal Cordillera over the Central Depression. Our study suggests that deformation progressed toward the eastern foreland during the early to late Miocene and then shifted toward the western forearc during the late Miocene to Pleistocene.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Amer Journal Science  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/  
dc.subject
ANDES  
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PRINCIPAL CORDILLERA  
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CURA MALLIN  
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BASIN  
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Geología  
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Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Cenozoic Basin Evolution During Alternating Extension and Shortening in the Southern Central Andes Along the Chile-Argentina Border, 37–38°S  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2025-07-29T11:59:54Z  
dc.journal.volume
324  
dc.journal.pagination
1-44  
dc.journal.pais
Estados Unidos  
dc.description.fil
Fil: Encinas, Alfonso. Universidad de Concepción. Facultad de Ciencias Naturales y Oceanografía; Chile  
dc.description.fil
Fil: Rosselot, Eduardo Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina  
dc.description.fil
Fil: Sagripanti, Lucía. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina  
dc.description.fil
Fil: Folguera Telichevsky, Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina  
dc.description.fil
Fil: Horton, Brian K.. University of Texas at Austin; Estados Unidos  
dc.description.fil
Fil: Orts, Darío Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; Argentina  
dc.description.fil
Fil: Valencia, Victor A.. Washington State University; Estados Unidos  
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Fil: Arriagada, Gabriel. Universidad de Concepción. Facultad de Ciencias Naturales y Oceanografía; Chile  
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Fil: Butikofer, Paz. Universidad de Concepción. Facultad de Ciencias Naturales y Oceanografía; Chile  
dc.description.fil
Fil: Solórzano, Andrés. Universidad Católica de Maule; Chile  
dc.journal.title
American Journal of Science  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://ajsonline.org/article/115328-cenozoic-basin-evolution-during-alternating-extension-and-shortening-in-the-southern-central-andes-along-the-chile-argentina-border-37-38-s  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.2475/001c.115328