2020
DOI: 10.1016/j.epsl.2020.116465
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Thermo-compositional structure of the north-eastern Canadian Shield from Rayleigh wave dispersion analysis as a record of its tectonic history

Abstract: The thermal and compositional structure of lithospheric keels underlying cratons, which are stable continental cores formed during the Precambrian, is still an enigma. Mapping lithospheric temperatures and compositional heterogeneities is essential to better understand geodynamic processes that control craton formation and evolution. Here we investigate the northeastern part of North America which comprises the Superior Craton, the largest Archean craton in the world, and surrounding Proterozoic belts. We mode… Show more

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Cited by 9 publications
(22 citation statements)
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References 94 publications
(128 reference statements)
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“…A variety of mechanisms have been proposed for the seismically observed MLDs within North America. One hypothesis is that the craton was formed at (at least) two stages, with the top 100–150 km representing the Archean lithosphere and the lower part formed at a later stage (e.g., Altoe et al., 2020; Eeken et al., 2020; Foster et al., 2020; Petrescu et al., 2017; Yuan & Romanowicz, 2010). Another mechanism is that the entire craton was formed during the Archean, but its lower part was later modified by subduction‐derived metasomatism (e.g., Boyce et al., 2016; Boyce et al., 2019).…”
Section: Discussionmentioning
confidence: 99%
“…A variety of mechanisms have been proposed for the seismically observed MLDs within North America. One hypothesis is that the craton was formed at (at least) two stages, with the top 100–150 km representing the Archean lithosphere and the lower part formed at a later stage (e.g., Altoe et al., 2020; Eeken et al., 2020; Foster et al., 2020; Petrescu et al., 2017; Yuan & Romanowicz, 2010). Another mechanism is that the entire craton was formed during the Archean, but its lower part was later modified by subduction‐derived metasomatism (e.g., Boyce et al., 2016; Boyce et al., 2019).…”
Section: Discussionmentioning
confidence: 99%
“…Emerging from this work and a few previous studies (Altoe et al, 2020;Boyce et al, 2019;Eakin, 2021;Eeken et al, 2020;Gilligan et al, 2016;Liddell et al, 2018) is the conclusion that the lithospheric mantle below the continental platform holds more of a record of its previous tectonic history than often assumed. The seismic data we use have more lateral resolution than the most recent thermo-compositional analyses by Finger et al (2021) and with the combination of dispersion curves and geoid we are able to better evaluate the variation in composition with depth.…”
Section: Structure and Tectonicsmentioning
confidence: 58%
“…The thermo-chemical structure of the mantle below each of the groups is estimated by performing a grid-search for a set of forward models that fit the dispersion curves, topography, and geoid anomalies within their uncertainties. The general approach used in this study follows the methods of Altoe et al (2020) and Eeken et al (2018); Eeken et al (2020), with an extension to fit density-sensitive data. The approach can be divided into four basic steps (Figure 4).…”
Section: Grid-search For Thermo-chemical Modelsmentioning
confidence: 99%
“…For example, OPX may also decrease with melt depletion under certain temperature and pressure conditions (Baker, 1994). Moreover, the possible existence of Eclogite, as found in the Superior Craton (Altoe et al., 2020), is not considered in our approach. In any case, the amount of Eclogite in a cratonic mantle should not be significant.…”
Section: Main Sources Of Uncertainties and Their Effects On Modeling ...mentioning
confidence: 99%