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Article: Neogene Retroarc Foreland Basin Evolution, Sediment Provenance, and Magmatism in Response to Flat Slab Subduction, Western Argentina

TitleNeogene Retroarc Foreland Basin Evolution, Sediment Provenance, and Magmatism in Response to Flat Slab Subduction, Western Argentina
Authors
Keywordsflat slab subduction
foreland basin
Argentina
Andes
detrital zircon U‐Pb geochronology
Issue Date2020
PublisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1944-9194/
Citation
Tectonics, 2020, v. 39 n. 7, p. article no. e2019TC005958 How to Cite?
AbstractUnderstanding the effects of flat slab subduction on mountain building, arc magmatism, and basin evolution is fundamental to convergent‐margin tectonics, with implications for potential feedbacks among geodynamic, magmatic, and surface processes. New stratigraphic and geochronological constraints on Cenozoic sedimentation and magmatism in the southern Central Andes of Argentina (31°S) reveal shifts in volcanism, foreland/hinterland basin development, sediment accumulation, and provenance as the retroarc region was structurally partitioned during slab flattening. Detrital zircon U‐Pb age distributions from the western (Calingasta basin), central (Talacasto and Albarracín basins), and eastern (Bermejo foreland basin) segments of the retroarc basin system preserve syndepositional volcanism and orogenic unroofing of multiple tectonic provinces. Initial shortening‐related exhumation of the Principal Cordillera at 24–17 Ma was recorded by the accumulation of distal eolian deposits bearing Oligocene–Eocene zircons from the Andean magmatic arc. The Calingasta basin chronicled volcanism and basement shortening in the Frontal Cordillera at ~17–11 Ma, as marked by an upward coarsening succession of fluvial to alluvial fan deposits with a sustained zircon U‐Pb age component that matches pervasive Permian‐Triassic bedrock in the hinterland. An ~450 km eastward inboard sweep of volcanism at 11 Ma coincided with the inception of flat slab subduction, and subsequent thin‐skinned shortening in the Precordillera fold‐thrust belt that exhumed wedge‐top deposits and induced cratonward (eastward) advance of flexural subsidence into the Bermejo foreland basin. This foreland basin was structurally partitioned as basement uplifts of the Sierras Pampeanas transformed a fluvial megafan sediment routing network into smaller isolated alluvial fan systems fed by adjacent basement blocks.
Persistent Identifierhttp://hdl.handle.net/10722/290564
ISSN
2020 Impact Factor: 4.851
2020 SCImago Journal Rankings: 2.465
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorCapaldi, TN-
dc.contributor.authorHorton, BK-
dc.contributor.authorMc Kenzie, NR-
dc.contributor.authorMackaman-Lofland, C-
dc.contributor.authorStockli, DF-
dc.contributor.authorOrtiz, G-
dc.contributor.authorAlvarado, P-
dc.date.accessioned2020-11-02T05:44:02Z-
dc.date.available2020-11-02T05:44:02Z-
dc.date.issued2020-
dc.identifier.citationTectonics, 2020, v. 39 n. 7, p. article no. e2019TC005958-
dc.identifier.issn0278-7407-
dc.identifier.urihttp://hdl.handle.net/10722/290564-
dc.description.abstractUnderstanding the effects of flat slab subduction on mountain building, arc magmatism, and basin evolution is fundamental to convergent‐margin tectonics, with implications for potential feedbacks among geodynamic, magmatic, and surface processes. New stratigraphic and geochronological constraints on Cenozoic sedimentation and magmatism in the southern Central Andes of Argentina (31°S) reveal shifts in volcanism, foreland/hinterland basin development, sediment accumulation, and provenance as the retroarc region was structurally partitioned during slab flattening. Detrital zircon U‐Pb age distributions from the western (Calingasta basin), central (Talacasto and Albarracín basins), and eastern (Bermejo foreland basin) segments of the retroarc basin system preserve syndepositional volcanism and orogenic unroofing of multiple tectonic provinces. Initial shortening‐related exhumation of the Principal Cordillera at 24–17 Ma was recorded by the accumulation of distal eolian deposits bearing Oligocene–Eocene zircons from the Andean magmatic arc. The Calingasta basin chronicled volcanism and basement shortening in the Frontal Cordillera at ~17–11 Ma, as marked by an upward coarsening succession of fluvial to alluvial fan deposits with a sustained zircon U‐Pb age component that matches pervasive Permian‐Triassic bedrock in the hinterland. An ~450 km eastward inboard sweep of volcanism at 11 Ma coincided with the inception of flat slab subduction, and subsequent thin‐skinned shortening in the Precordillera fold‐thrust belt that exhumed wedge‐top deposits and induced cratonward (eastward) advance of flexural subsidence into the Bermejo foreland basin. This foreland basin was structurally partitioned as basement uplifts of the Sierras Pampeanas transformed a fluvial megafan sediment routing network into smaller isolated alluvial fan systems fed by adjacent basement blocks.-
dc.languageeng-
dc.publisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1944-9194/-
dc.relation.ispartofTectonics-
dc.rightsTectonics. Copyright © American Geophysical Union.-
dc.rights©[2020]. American Geophysical Union. All Rights Reserved. This article is available at https://doi.org/10.1029/2019TC005958-
dc.subjectflat slab subduction-
dc.subjectforeland basin-
dc.subjectArgentina-
dc.subjectAndes-
dc.subjectdetrital zircon U‐Pb geochronology-
dc.titleNeogene Retroarc Foreland Basin Evolution, Sediment Provenance, and Magmatism in Response to Flat Slab Subduction, Western Argentina-
dc.typeArticle-
dc.identifier.emailMc Kenzie, NR: ryan00@hku.hk-
dc.identifier.authorityMc Kenzie, NR=rp02198-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1029/2019TC005958-
dc.identifier.scopuseid_2-s2.0-85088640550-
dc.identifier.hkuros318408-
dc.identifier.volume39-
dc.identifier.issue7-
dc.identifier.spagearticle no. e2019TC005958-
dc.identifier.epagearticle no. e2019TC005958-
dc.identifier.isiWOS:000556710300021-
dc.publisher.placeUnited States-
dc.identifier.issnl0278-7407-

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