Tectonic Subsidence Modeling of Diachronous Transition From Backarc to Retroarc Basin Development and Uplift During Cordilleran Orogenesis, Patagonian-Fuegian Andes

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dc.contributor.authorVanderLeest, Rebecca A.en
dc.contributor.authorFosdick, Julie C.en
dc.contributor.authorMalkowski, Matthew A.en
dc.contributor.authorRomans, Brian W.en
dc.contributor.authorGhiglione, Matias C.en
dc.contributor.authorSchwartz, Theresa M.en
dc.contributor.authorSickmann, Zachary T.en
dc.date.accessioned2023-06-12T15:02:30Zen
dc.date.available2023-06-12T15:02:30Zen
dc.date.issued2022-10en
dc.description.abstractBackstripped tectonic basin subsidence histories are critical for interpreting phases of lithospheric deformation and paleoenvironmental change from the stratigraphic record. This study presents new subsidence modeling of the Rocas Verdes Backarc Basin (RVB) and Magallanes-Austral retroarc foreland basin (MAB) of southernmost South America to evaluate along-strike changes in tectonic subsidence related to the Late Jurassic through Miocene history of the Southern Andes. We compiled composite stratigraphic sections for seven basin localities that span 47 degrees-54 degrees S from published sedimentological records of paleoenvironment, paleobathymetry, and geochronology. Modeling results resolve regional trends in basin tectonic subsidence, uplift, and sedimentation rate that influenced the depositional environment during five broad phases of RVB-MAB development: (a) Late Jurassic tectonic subsidence and basin deepening associated with rift-related backarc extension that postdated regional diachronous rift-related magmatism. (b) Southward younging of Early to Late Cretaceous pronounced acceleration in tectonic subsidence interpreted as the initiation of flexural loading and development of the MAB foreland basin system. (c) Late Cretaceous (ca. 85-70 Ma) tectonic uplift within the central foredeep similar to 49 degrees to 52 degrees S, coeval with a shift from slope to shelf deposition at these latitudes. (d) A protracted period of low-magnitude basin uplift and relative tectonic quiescence during the Paleogene, with the exception of southernmost localities; and (e) Synchronous latest Oligocene-early Miocene tectonic subsidence linked to basin deepening and transgression across the northern and central basin sectors. Backstripped tectonic subsidence analysis corroborates existing interpretations for orogenic development in the RVB-MAB and sheds new light on complex polyphase basin histories where extension precedes convergence.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesWe gratefully acknowledge student funding from the Geological Society of America (GSA) Student Research Grant Program, The Society of Sedimentary Geology (SEPM) student research grant, American Association of Petroleum Geologists (AAPG) Grants-in-Aid, and the University of Connecticut Nalwalk Award to RAV. Research was also supported by the U.S. National Science Foundation Award EAR-1649585 to JCF. We thank Platte River Associates for granting us an educational license for BasinMod (R). Discussions with Andrea Stevens-Goddard, Enrique Bostelmann, and Benjamin Daniels improved the scope of our work. We thank three anonymous reviewers and Associate Editor Augusto Rapalini for constructive reviews of our manuscript. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.en
dc.description.sponsorshipGeological Society of America (GSA) Student Research Grant Program; Society of Sedimentary Geology (SEPM) student research grant; American Association of Petroleum Geologists (AAPG); University of Connecticut Nalwalk Award; U.S. National Science Foundation [EAR-1649585]en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1029/2021TC006891en
dc.identifier.eissn1944-9194en
dc.identifier.issn0278-7407en
dc.identifier.issue10en
dc.identifier.urihttp://hdl.handle.net/10919/115401en
dc.identifier.volume41en
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.rightsPublic Domain (U.S.)en
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/en
dc.subjectbasin analysisen
dc.subjectbackstripped tectonic subsidenceen
dc.subjectMagallanes-Austral Basinen
dc.subjectstratigraphyen
dc.subjecttectonicsen
dc.subjectPatagoniaen
dc.titleTectonic Subsidence Modeling of Diachronous Transition From Backarc to Retroarc Basin Development and Uplift During Cordilleran Orogenesis, Patagonian-Fuegian Andesen
dc.title.serialTectonicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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