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Volume 27, Issue 4
  • E-ISSN: 1365-2117

Abstract

Abstract

The Patagonian Magallanes retroarc foreland basin affords an excellent case study of sediment burial recycling within a thrust belt setting. We report combined detrital zircon U–Pb geochronology and (U–Th)/He thermochronology data and thermal modelling results that confirm delivery of both rapidly cooled, first‐cycle volcanogenic sediments from the Patagonian magmatic arc and recycled sediment from deeply buried and exhumed Cretaceous foredeep strata to the Cenozoic depocentre of the Patagonian Magallanes basin. We have quantified the magnitude of Eocene heating with thermal models that simultaneously forward model detrital zircon (U–Th)/He dates for best‐fit thermal histories. Our results indicate that 54–45 Ma burial of the Maastrichtian Dorotea Formation produced 164–180 °C conditions and heating to within the zircon He partial retention zone. Such deep burial is unusual for Andean foreland basins and may have resulted from combined effects of high basal heat flow and high sediment accumulation within a rapidly subsiding foredeep that was floored by basement weakened by previous Late Jurassic rifting. In this interpretation, Cenozoic thrust‐related deformation deeply eroded the Dorotea Formation from . 5 km burial depths and may be responsible for the development of a basin‐wide Palaeogene unconformity. Results from the Cenozoic Río Turbio and Santa Cruz formations confirm that they contain both Cenozoic first‐cycle zircon from the Patagonian magmatic arc and highly outgassed zircon recycled from older basin strata that experienced burial histories similar to those of the Dorotea Formation.

Basin Research © 2015 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists © 2014 The Authors. Basin Research © 2014 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists
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2014-08-28
2024-04-26

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Detrital thermochronologic record of burial heating and sediment recycling in the Magallanes foreland basin, Patagonian Andes
Basin Research 27, 546 (2015); https://doi.org/10.1111/bre.12088
/content/journals/10.1111/bre.12088
/content/journals/10.1111/bre.12088
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Sample location information for detrital zircon thermochronology samples. Detrital zircon U–Pb geochronologic analyses by LA‐ICP‐MS analysis. The * indicates radiogenic Pb (corrected for common Pb). All errors are reported at the 1σ level. Combined zircon U–Pb and He data from subset of selected detrital zircons. is the alpha‐ejection correction after Farley (2002). Samples in italics indicate discordant grains that are not included in probability distribution calculations. Thermal modelling input parameters for calculating forward modelled He dates. Parameters used for decompacted sedimentation and erosion rates.

Tera‐Wasserburg Concordia diagrams for zircon U–Pb data. All plots were made with Isoplot (Ludwig, 2008).

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Cumulative probability distributions for modelled zircon He dates calculated from best‐fit thermal histories. Best‐fit distributions are shown for thermal models that pass the Kolmogorov–Smirnoff statistical test (K–S) with probability values >0.68 and >0.95 compared to measured cumulative distribution of He dates (black line). Top: Maastrichtian Dorotea Formation (samples 09‐208 and 09‐226). Bottom: Miocene Santa Cruz Formation (for > 65 Ma grains from samples 09‐235 and 09‐207). See text for details.

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  • Article Type: Research Article

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