Constraints on mantle viscosity and Laurentide ice sheet evolution from pluvial paleolake shorelines in the western United States

Austermann, Jacqueline; Chen, Christine Y.; Lau, H. C. P.; Maloof, Adam C.; Latychev, Konstantin

doi:10.31223/osf.io/e6byp

Cited by 3 publications

(4 citation statements)

References 28 publications

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“…It is of great importance that seismic tomography be used in combination with flexural studies to understand the structure of continental lithosphere, because estimates of T e that are consistent with the thickness of the mechanically competent upper crust cannot be used independently to discriminate between a jelly sandwich and a crème brûlée configuration (Burov, 2015). For example, seismic tomography indicates that old, cold, and thick mantle lithosphere does not exist at Lake Bonneville (Austermann et al., 2019; Shen et al., 2013). We propose that the presence of a weak lower crust could be partially responsible for the low inferred values of T e at coronae (Russell & Johnson, 2021) despite the stagnant‐lid convection style of Venus, but future missions will be required to test this hypothesis using seismic tomography.…”

Section: Discussionmentioning

confidence: 99%

Effects of a Weak Lower Crust on the Flexure of Continental Lithosphere

Bellas

Zhong

2021

JGR Solid Earth

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The rheology of continental lithosphere controls seismicity, orogeny, basin-formation in continents, and is partially responsible for the bimodal recycling of Earth's surface wherein continental lithosphere may be older than several Ga while oceanic lithosphere is generally younger than 200 Ma. Because of the sensitivity of lithospheric rheology to temperature and composition, increased crustal thickness may give rise to an intermediate weak layer (i.e., weak lower crust) (Bird, 1991;Chen & Molnar, 1983), which may have a significant impact on the tectonics of orogenic regions such as Tibet (Clark & Royden, 2000;Royden et al., 1997). Lithospheric rheology is frequently investigated in mineral physics experiments (Goetze & Evans, 1979) and inferred from field observations of radial seismic anisotropy (e.g., Shapiro et al., 2004) and surface wave tomography (Shen et al., 2013) which show that crustal rocks (e.g., quartz, diabase) may become extremely weak for conditions under which adjacent lithospheric mantle rocks remain much stronger (e.g., olivine). Lithospheric rheology is also frequently constrained by observations of flexure in response to surface loads such as mountains ranges, plateaus, basins, and glacial isostatic adjustment (Watts, 2001). However, it is not necessarily clear what effects an intermediate weak layer may have on lithospheric flexure and what

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Section: Discussionmentioning

confidence: 99%

Effects of a Weak Lower Crust on the Flexure of Continental Lithosphere

Bellas

Zhong

2021

JGR Solid Earth

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“…We place glacial isostatic adjustment‐related processes to indicate the potential importance of transient creep. Note that “lake rebound” refers to how the drainage of lakes can produce isostatic adjustment (e.g., the rapid drainage of Lake Bonneville (∼14 kyr BP) over ∼500 years; Austermann et al., 2020).…”

Section: The Full Spectrum Of Viscoelastic Deformationmentioning

confidence: 99%

“…In this study, we aim to investigate the role of more complex rheologies by simultaneously exploring the effects of frequency dependent and non‐linear rheology on GIA in Antarctica. While we focus on Antarctica here, there is much evidence to suggest that these effects are at play elsewhere, for example, in Southwest North America, where processes like postseismic relaxation (e.g., Bürgmann & Dresen, 2008), or lake rebound (e.g., Austermann et al., 2020) have been recorded.…”

Section: Introductionmentioning

confidence: 99%

Frequency Dependent Mantle Viscoelasticity via the Complex Viscosity: Cases From Antarctica

et al. 2021

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The growth and decay of ice sheets over the Pleistocene represent large variations in Earth's climate system and induce significant deformation of the solid Earth. This deformation (including associated changes to Earth's stress and gravity field, and its rotation axis), in response to the redistribution of ice and ocean mass, is known as "glacial isostatic adjustment" (GIA). Areas that were formerly covered by or close to major ice sheets during the last glacial period, such as Fennoscandia, Greenland, North America and Antarctica, continue to experience the highest rates of GIA-related deformation today, even though ice has retreated partially or entirely (e.g., Sella et al., 2007). Pertinent to understanding this solid Earth deformation, and, as a consequence, related climatological feedbacks (e.g., Larour et al., 2019;Pan et al., 2021) is knowledge of the planet's viscoelastic structure. Constraining Earth's viscoelastic structure has been the focus of many GIA, geodynamic, seismic, and mineral/rock physics studies. In GIA studies, viscoelastic deformation is often assumed to be linear with one

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“…At present, the paleo‐shorelines of proglacial lakes are often not found at a constant elevation because they have been deformed due to glacial isostatic adjustment (GIA), which is the response of the Earth's topography, gravity field, and rotation axis to changes in ice and ocean loads (e.g., M. Lewis et al., 2021). Shoreline deformation patterns of ice‐proximal lakes can therefore be used to constrain past ice‐sheet histories (Austermann et al., 2020; Gowan et al., 2016; Lambeck et al., 2010, 2017). In turn, GIA may have influenced the depth and extent of proglacial lakes over the ice age through crustal deformation and gravitational perturbations.…”

Section: Introductionmentioning

confidence: 99%

Glacial Isostatic Adjustment Shapes Proglacial Lakes Over Glacial Cycles

Austermann

Wickert

Pico

et al. 2022

Geophysical Research Letters

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Proglacial lakes are freshwater bodies that form within topographic depressions at an ice sheet's terrestrial margin. These depressions can preexist, or they can be established (or enhanced) by the presence of the ice sheet through its ability to dam water directly and to generate isostatic depressions. Proglacial lakes formed at the margins of both the Laurentide and Fennoscandian ice sheets during the Quaternary (

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Constraints on mantle viscosity and Laurentide ice sheet evolution from pluvial paleolake shorelines in the western United States

Abstract: Please cite this article as: Austermann, J., et al. Constraints on mantle viscosity and Laurentide ice sheet evolution from pluvial paleolake shorelines in the western United States.

Cited by 3 publications

References 28 publications

Effects of a Weak Lower Crust on the Flexure of Continental Lithosphere

Effects of a Weak Lower Crust on the Flexure of Continental Lithosphere

Frequency Dependent Mantle Viscoelasticity via the Complex Viscosity: Cases From Antarctica

Glacial Isostatic Adjustment Shapes Proglacial Lakes Over Glacial Cycles

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