Lithospheric erosion in the Patagonian slab window, and implications for glacial isostasy

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Mark, Hannah F.
Wiens, Douglas A.
Ivins, Erik
Richter, Andreas
Mansour, Walid Ben
Magnani, M. Beatrice
Marderwald, Eric
Adaros, Rodrigo
Barrientos, Sergio
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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).
Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 49(2), (2022): e2021GL096863,
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Mark, H. F., Wiens, D. A., Ivins, E. R., Richter, A., Ben Mansour, W., Magnani, M. B., Marderwald, E., Adaros, R., & Barrientos, S. (2022). Lithospheric erosion in the Patagonian slab window, and implications for glacial isostasy. Geophysical Research Letters, 49(2), e2021GL096863.
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