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Cited by 20High-pressure geophysics and materialsGeological and Tectonic Studies in Latin AmericaGeological and Geophysical Studies

Mantle Flow Pattern Associated With the Patagonian Slab Window Determined From Azimuthal Anisotropy

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Ben‐Mansour, Walid, Wiens, Douglas A., Mark, Hannah F., Russo, Raymond M., Richter, Andreas, Marderwald, Eric, Barrientos, Sergio·2022·Geophysical Research Letters
DOI 10.1029/2022gl099871
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Abstract

Geological processes in Southern Patagonia are affected by the Patagonian slab window, formed by the subduction of the Chile Ridge and subsequent northward migration of the Chile Triple Junction. Using shear wave splitting analysis, we observe strong splitting of up to 2.5 s with an E‐W fast direction just south of the triple junction and the edge of the subducting Nazca slab. This region of strong anisotropy is coincident with low uppermost mantle shear velocities and an absence of mantle lithosphere, indicating that the mantle flow occurs in a warm, low‐viscosity, 200–300 km wide shallow mantle channel just to the south of the Nazca slab. The region of flow corresponds to a volcanic gap caused by depleted mantle compositions and absence of slab‐derived water. In most of Patagonia to the south of this channel, splitting fast directions trend NE‐SW consistent with large‐scale asthenospheric flow.

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Crossref · 10.1029/2022gl099871

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  • 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”

    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 Ben-Mansour et al., 2022

    The Introduction says the slab window produces lithospheric thickness anomalies, and Section 4.1 describes thermal and mechanical erosion of the mantle lithosphere. Our copy does not say that this thinning affects regional uplift rates; a reference title mentions implications for glacial isostatic adjustment, but that does not establish the claimed effect. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

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Cites

Flagged first, then by citations

Research works printed but not linked: 28

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Authors
Ben‐Mansour, W., Wiens, D. A., Mark, H. F., Russo, R. M., Richter, A., Marderwald, E., & Barrientos, S.
Affiliations
  • Washington University in St. Louis (US)
  • University of Florida (US)
  • Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
  • Centro Sismológico Nacional (CL)
Corresponding author
Ben‐Mansour, Walid
ORCID
Venue
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Published
2022-09-15
Volume
49
Issue
18
ISSN
  • 0094-8276 (ISSN-L)
  • 1944-8007
DOI
10.1029/2022gl099871
OpenAlex
W4295884690
Cited by
20
References
1
Citations by year
2026: 3 · 2025: 6 · 2024: 7 · 2023: 4
FWCI
2.47
Type
journal article
Language
en
Open access
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Locations
  • Geophysical Research Letters (publishedVersion)
  • EarthArXiv (California Digital Library) (submittedVersion, public-domain)
  • Open Access Server of the Woods Hole Scientific Community (Woods Hole Scientific Community) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
National Science Foundation (EAR‐1714154)
Topics
  • 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
  • Physical Sciences › Earth and Planetary Sciences › Geology › Geological and Geophysical Studies
Keywords
mantle flow, azimuthal anisotropy, shear wave splitting, Chile Triple Junction, Nazca slab, asthenospheric flow, depleted mantle, southern Patagonia

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