[7-7] The role of the asthenospheric window and deglaciation on the present-day uplift of the southern Patagonian Andes
Abstract: The southern Patagonian Andes (~46-56°S) are well suited to investigate the tectonic vs. climatic interactions during mountain building. Oceanic subduction underneath the South America continent occurs jointly with the opening of an asthenospheric window and, during the late Cenozoic, the...
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Online Access: | https://dx.doi.org/10.48448/gea2-9n07 https://underline.io/lecture/33797-7-7-the-role-of-the-asthenospheric-window-and-deglaciation-on-the-present-day-uplift-of-the-southern-patagonian-andes |
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ftdatacite:10.48448/gea2-9n07 2023-05-15T16:40:42+02:00 [7-7] The role of the asthenospheric window and deglaciation on the present-day uplift of the southern Patagonian Andes Societa Geologica Italiana 2021 Astarte Paiva Muller, Veleda 2021 https://dx.doi.org/10.48448/gea2-9n07 https://underline.io/lecture/33797-7-7-the-role-of-the-asthenospheric-window-and-deglaciation-on-the-present-day-uplift-of-the-southern-patagonian-andes unknown Underline Science Inc. MediaObject article Conference talk Audiovisual 2021 ftdatacite https://doi.org/10.48448/gea2-9n07 2022-02-09T11:28:00Z Abstract: The southern Patagonian Andes (~46-56°S) are well suited to investigate the tectonic vs. climatic interactions during mountain building. Oceanic subduction underneath the South America continent occurs jointly with the opening of an asthenospheric window and, during the late Cenozoic, the building and melting of the Patagonian Icefields. Although the asthenospheric window caused regional dynamic uplift estimated in the order of the tenths of mm per year during the last 3 Ma, the present-day uplift rates in the orogenic domain subject to glaciation are measured between ~10-40 mm/yr. These uplift rates are to a large extent related to the glacial rebound since the Little Ice Age (~ AD 1630), but the role of rheological mantle and lithospheric weakening due to the asthenospheric window is currently unconstrained. Here we use numerical thermo-mechanical modeling to estimate the uplift induced by deglaciation of an ice sheet accounting for the rheological effects of asthenospheric thermal anomalies. Our results show two main phases of rock uplift: 1) a rapid increase in the uplift rates below the ice sheet when deglaciation starts, and 2) stable positive uplift rates during the deglaciation. For any tested, plausible rheological setting, the maximum uplift rates is <10 mm/yr in the absence of an asthenospheric thermal anomaly, and >30 mm/yr with thermal anomalies higher than 100°C. The higher the asthenospheric thermal anomaly, the higher and wider the uplift rates, which may also involve initially ice-free regions. Uplift rates similar to those observed today require an asthenospheric thermal anomaly of 150-200°C. We conclude that, although the driver of the present-day uplift rates is the deglaciation, the asthenospheric window largely controls its outstanding magnitude. Authors:* Paiva Muller V.A.*, Sternai P. & Sue C. Article in Journal/Newspaper Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) |
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Abstract: The southern Patagonian Andes (~46-56°S) are well suited to investigate the tectonic vs. climatic interactions during mountain building. Oceanic subduction underneath the South America continent occurs jointly with the opening of an asthenospheric window and, during the late Cenozoic, the building and melting of the Patagonian Icefields. Although the asthenospheric window caused regional dynamic uplift estimated in the order of the tenths of mm per year during the last 3 Ma, the present-day uplift rates in the orogenic domain subject to glaciation are measured between ~10-40 mm/yr. These uplift rates are to a large extent related to the glacial rebound since the Little Ice Age (~ AD 1630), but the role of rheological mantle and lithospheric weakening due to the asthenospheric window is currently unconstrained. Here we use numerical thermo-mechanical modeling to estimate the uplift induced by deglaciation of an ice sheet accounting for the rheological effects of asthenospheric thermal anomalies. Our results show two main phases of rock uplift: 1) a rapid increase in the uplift rates below the ice sheet when deglaciation starts, and 2) stable positive uplift rates during the deglaciation. For any tested, plausible rheological setting, the maximum uplift rates is <10 mm/yr in the absence of an asthenospheric thermal anomaly, and >30 mm/yr with thermal anomalies higher than 100°C. The higher the asthenospheric thermal anomaly, the higher and wider the uplift rates, which may also involve initially ice-free regions. Uplift rates similar to those observed today require an asthenospheric thermal anomaly of 150-200°C. We conclude that, although the driver of the present-day uplift rates is the deglaciation, the asthenospheric window largely controls its outstanding magnitude. Authors:* Paiva Muller V.A.*, Sternai P. & Sue C. |
format |
Article in Journal/Newspaper |
author |
Societa Geologica Italiana 2021 Astarte Paiva Muller, Veleda |
spellingShingle |
Societa Geologica Italiana 2021 Astarte Paiva Muller, Veleda [7-7] The role of the asthenospheric window and deglaciation on the present-day uplift of the southern Patagonian Andes |
author_facet |
Societa Geologica Italiana 2021 Astarte Paiva Muller, Veleda |
author_sort |
Societa Geologica Italiana 2021 |
title |
[7-7] The role of the asthenospheric window and deglaciation on the present-day uplift of the southern Patagonian Andes |
title_short |
[7-7] The role of the asthenospheric window and deglaciation on the present-day uplift of the southern Patagonian Andes |
title_full |
[7-7] The role of the asthenospheric window and deglaciation on the present-day uplift of the southern Patagonian Andes |
title_fullStr |
[7-7] The role of the asthenospheric window and deglaciation on the present-day uplift of the southern Patagonian Andes |
title_full_unstemmed |
[7-7] The role of the asthenospheric window and deglaciation on the present-day uplift of the southern Patagonian Andes |
title_sort |
[7-7] the role of the asthenospheric window and deglaciation on the present-day uplift of the southern patagonian andes |
publisher |
Underline Science Inc. |
publishDate |
2021 |
url |
https://dx.doi.org/10.48448/gea2-9n07 https://underline.io/lecture/33797-7-7-the-role-of-the-asthenospheric-window-and-deglaciation-on-the-present-day-uplift-of-the-southern-patagonian-andes |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_doi |
https://doi.org/10.48448/gea2-9n07 |
_version_ |
1766031103129288704 |