Cited by 38Cryospheric studies and observationsHigh-pressure geophysics and materialsGeological and Tectonic Studies in Latin America

Lithospheric Erosion in the Patagonian Slab Window, and Implications for Glacial Isostasy

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Mark, Hannah F., Wiens, Douglas A., Ivins, Erik R., Richter, Andreas, Ben Mansour, Walid, Magnani, M. Beatrice, Marderwald, Eric, Adaros, Rodrigo +1 more·2022·Geophysical Research Letters

Published version of a preprint

Abstract

The Patagonian slab window has been proposed to enhance the solid Earth response to ice mass load changes in the overlying Northern and Southern Patagonian Icefields (NPI and SPI, respectively). Here, we present the first regional seismic velocity model covering the entire north‐south extent of the slab window. A slow velocity anomaly in the uppermost mantle indicates warm mantle temperature, low viscosity, and possibly partial melt. Low velocities just below the Moho suggest that the lithospheric mantle has been thermally eroded over the youngest part of the slab window. The slowest part of the anomaly is north of 49°S, implying that the NPI and the northern SPI overlie lower viscosity mantle than the southern SPI. This comprehensive seismic mapping of the slab window provides key evidence supporting the previously hypothesized connection between post‐Little Ice Age anthropogenic ice mass loss and rapid geodetically observed glacial isostatic uplift (≥4 cm/yr).

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  • The asthenosphere viscosity from the models when TA > 100 °C is <10^19 Pa s, with the lowest viscosity value of 10^16 Pa s imposed where partial melting occurs.

    “the asthenosphere viscosity from our models when TA > 100 °C is < 10 19 Pa s, with the lowest viscosity value of 10 16 Pa s imposed where partial melting, supported by the regional Holocene volcanism (Stern and Kilian, 1996) and by geophysical data (e.g.shear wave velocity data by Mark et al., 2022), occurs.”

    From Fast uplift in the southern Patagonian Andes due to long- and short-term deglaciation and the asthenospheric window underneath (2024) · cites this paper as Mark et al., 2022

    Section 3.1 reports anomalously low shear-wave velocities in the Patagonian slab window, so Mark et al. provide the geophysical data cited. Section 3.2 says thermal erosion likely requires melt or fluids and that melt may be supplied by upwelling mantle; it does not establish that partial melting occurs at the specific locations where the citing authors impose their lowest viscosity. The viscosity values are attributed to the citing authors’ own models, not to Mark et al. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Increased asthenospheric temperatures beneath southern Patagonia are highly supported by geophysical data.

    “increased asthenospheric temperatures beneath southern Patagonia are highly supported by the geophysical data”
  • The thermo-mechanical visco-elastoplastic forward modelling approach helps to constrain the increase in temperature in geodynamic asthenospheric upwelling contexts, such as in southern Patagonia.

    “Our thermo-mechanical visco-elastoplastic forward modelling approach thus helps to constrain the increase in temperature in geodynamic asthenospheric upwelling contexts, such as in southern Patagonia”
  • Lithospheric thinning due to the asthenospheric window underneath southern Patagonia affects the regional uplift rates.

    “Lithospheric thinning due to the asthenospheric window underneath southern Patagonia thus affects the regional uplift rates as previously suggested”

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Authors
Mark, H. F., Wiens, D. A., Ivins, E. R., Richter, A., Ben Mansour, W., Magnani, M. B., Marderwald, E., Adaros, R., & Barrientos, S.
Affiliations
  • Washington University in St. Louis (US)
  • Jet Propulsion Laboratory (US)
  • Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
  • Department of Earth and Planetary Sciences Washington University in St. Louis St. Louis MO USA
  • Southern Methodist University (US)
  • Empresa Nacional del Petróleo Magallanes Chile
  • Centro Sismológico Nacional (CL)
Corresponding author
Mark, Hannah F.
Venue
Geophysical Research Letters
Published
2022-01-25
Volume
49
Issue
2
ISSN
  • 0094-8276 (ISSN-L)
  • 1944-8007
OpenAlex
W4226389690
Cited by
38
References
74
Citations by year
2026: 7 · 2025: 11 · 2024: 8 · 2023: 11 · 2022: 1
FWCI
2.96
Type
journal article
Language
en
Open access
Locations
  • Geophysical Research Letters (publishedVersion)
  • Open Access Server of the Woods Hole Scientific Community (Woods Hole Scientific Community) (submittedVersion)
Funders
  • National Science Foundation (EAR‐1714154, EAR‐1714662)
  • Jet Propulsion Laboratory (NNH19ZDA001N‐GRACEFO)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Cryospheric studies and observations
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Tectonic Studies in Latin America
Keywords
glacial isostasy, glacial isostatic adjustment, Northern Patagonian Icefield, Southern Patagonian Icefield, seismic velocity model, mantle viscosity, partial melt, Little Ice Age

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