Using detrital zircon U-Pb ages to calculate Late Cretaceous sedimentation rates in the Magallanes-Austral basin, Patagonia

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dc.citation.epage746en_US
dc.citation.issue6en_US
dc.citation.spage725en_US
dc.citation.volume29en_US
dc.contributor.authorSchwartz, Theresa M.
dc.contributor.authorFosdick, Julie C.
dc.contributor.authorGraham, Stephan A.
dc.contributor.avlauthorSchwartz, Theresa M.
dc.contributor.departmentGeologyen_US
dc.date.accessioned2017-12-18T19:04:48Z
dc.date.available2017-12-18T19:04:48Z
dc.date.issued2016-07-08
dc.description.abstractDetermining both short- and long-term sedimentation rates is becoming increasingly important in geomorphic (exhumation and sediment flux), structural (subsidence/flexure) and natural resource (predictive modelling) studies. Determining sedimentation rates for ancient sedimentary sequences is often hampered by poor understanding of stratigraphic architecture, long-term variability in large-scale sediment dispersal patterns and inconsistent availability of absolute age data. Uranium-Lead (U-Pb) detrital zircon (DZ) geochronology is not only a popular method to determine the provenance of siliciclastic sedimentary rocks but also helps delimit the age of sedimentary sequences, especially in basins associated with protracted volcanism. This study assesses the reliability of U-Pb DZ ages as proxies for depositional ages of Upper Cretaceous strata in the Magallanes-Austral retroarc foreland basin of Patagonia. Progressive younging of maximum depositional ages (MDAs) calculated from young zircon populations in the Upper Cretaceous Dorotea Formation suggests that the MDAs are potential proxies for absolute age, and constrain the age of the Dorotea Formation to be ca. 82-69 Ma. Even if the MDAs do not truly represent ages of contemporaneous volcanic eruptions in the arc, they may still indicate progressive-but-lagged delivery of increasingly younger volcanogenic zircon to the basin. In this case, MDAs may still be a means to determine long-term (1-2Myr) average sedimentation rates. Burial history models built using the MDAs reveal high aggradation rates during an initial, deep-marine phase of the basin. As the basin shoaled to shelfal depths, aggradation rates decreased significantly and were outpaced by progradation of the deposystem. This transition is likely linked to eastward propagation of the Magallanes fold-thrust belt during Campanian-Maastrichtian time, and demonstrates the influence of predecessor basin history on foreland basin dynamics.en_US
dc.description.embargoThis version of the article is available for viewing to the public after 12/18/2017.en_US
dc.description.versionPublished articleen_US
dc.identifier.citationSchwartz, T.M., Fosdick, J.C., and Graham, S.A. (2016). Using detrital zircon U-Pb ages to calculate Late Cretaceous sedimentation rates in the Magallanes-Austral basin, Patagonia. Basin Research 29(6): 725-746. Doi:10.111/bre.12198en_US
dc.identifier.doi10.111/bre.12198
dc.identifier.issn0950-091X
dc.identifier.issne1365-2117
dc.identifier.urihttp://hdl.handle.net/10456/45387
dc.language.isoen_USen_US
dc.publisherWileyen_US
dc.relation.ispartofBasin Researchen_US
dc.relation.isversionofhttps://doi.org/10.111/bre.12198en_US
dc.rightsThis is the pre-peer reviewed version of the following article: Schwartz, T.M., Fosdick, J.C., and Graham, S.A. (2016). Using detrital zircon U-Pb ages to calculate Late Cretaceous sedimentation rates in the Magallanes-Austral basin, Patagonia. Basin Research 29(6): 725-746. Doi:10.111/bre.12198, which has been published in final form at https://doi.org/10.111/bre.12198. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.en_US
dc.titleUsing detrital zircon U-Pb ages to calculate Late Cretaceous sedimentation rates in the Magallanes-Austral basin, Patagoniaen_US
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