Stratigraphy of the Archean western Superior Province from P- and S-wave receiver functions: Further evidence for tectonic accretion?

Angus, D.A.; Kendall, J.‐M.; Wilson, David C.; White, Donald J; Sol, S.; Thomson, C. J.

doi:10.1016/j.pepi.2009.09.002

Cited by 17 publications

(16 citation statements)

References 45 publications

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“…Teleseismic P waveforms were used from earthquakes with M w > 5.5 and distances of 30–90°. The main steps in the multimode receiver function imaging approach were estimation of P ‐to‐ S ( Ps ) receiver functions, mapping of receiver function time to depth for three scattering modes [ Wilson and Aster , ] (see supporting information), and common conversion point (CCP) stacking to form a 3‐D image [ Dueker and Sheehan , ; Angus et al, ]. Receiver functions were estimated with a multichannel source estimation and deconvolution method [ Mercier et al, ; Hansen and Dueker , ], expanding upon results of Schmandt et al [].…”

Section: Methodssupporting

confidence: 57%

Distinct crustal isostasy trends east and west of the Rocky Mountain Front

Schmandt

Lin

Karlstrom

2015

Geophysical Research Letters

129

199

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Seismic structure beneath the contiguous U.S. was imaged with multimode receiver function stacking and inversion of Rayleigh wave dispersion and ellipticity measurements. Crust thickness and elevation are weakly correlated across the contiguous U.S., but the correlation is ~3–4 times greater for separate areas east and west of the Rocky Mountain Front (RMF). Greater lower crustal shear velocities east of the RMF, particularly in low‐elevation areas with thick crust, are consistent with deep crustal density as the primary cause of the contrasting crust thickness versus elevation trends. Separate eastern and western trends are best fit by Airy isostasy models that assume lower crust to uppermost mantle density increases of 0.18 g/cm3 and 0.40 g/cm3, respectively. The former value is near the minimum that is plausible for felsic lower crust. Location of the transition at the RMF suggests that Laramide to post‐Laramide processes reduced western U.S. lower crustal density.

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Section: Methodssupporting

confidence: 57%

Distinct crustal isostasy trends east and west of the Rocky Mountain Front

Schmandt

Lin

Karlstrom

2015

Geophysical Research Letters

129

199

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“…Conversion-point binning with simultaneous deconvolution in the frequency domain 14,15 is used for detailed modelling of robust features. Extended multitaper deconvolution 16 followed by migration and stacking 9,17 confirms robust features and gives a three-dimensional view of lithospheric structure. High-resolution coverage is provided by three data sets ( Fig.…”

mentioning

confidence: 67%

Volcanism in the Afar Rift sustained by decompression melting with minimal plume influence

Rychert¹,

Hammond²,

et al. 2012

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“…A band‐pass filter of 0.02 to 0.5 Hz is applied to the deconvolved waveforms, which are then migrated to depth along the ray paths of the respective Sp phase and stacked into a 0.25° × 0.25° × 1‐km grid (Angus et al, ; Rychert et al, ). Grid points (bins) with less than five hits are discarded, and the grids are subsequently smoothed according to the Fresnel zone (Fowler, ) of each waveform, with a minimum width of 20 km.…”

Section: Methodsmentioning

confidence: 99%

Seismic Imaging of the North American Midcontinent Rift Using S‐to‐P Receiver Functions

et al. 2018

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North America's ~1.1‐Ga failed Midcontinent Rift (MCR) is a striking feature of gravity and magnetic anomaly maps across the continent. However, how the rift affected the underlying lithosphere is not well understood. With data from the Superior Province Rifting Earthscope Experiment and the USArray Transportable Array, we constrain three‐dimensional seismic velocity discontinuity structure in the lithosphere beneath the southwestward arm of the MCR using S ‐to‐ P receiver functions. We image a velocity increase with depth associated with the Moho at depths of 33–40 ± 4 km, generally deepening toward the east. The Moho amplitude decreases beneath the rift axis in Minnesota and Wisconsin, where the velocity gradient is more gradual, possibly due to crustal underplating. We see hints of a deeper velocity increase at 61 ± 4‐km depth that may be the base of underplating. Beneath the rift axis further south in Iowa, we image two distinct positive phases at 34–39 ± 4 and 62–65 ± 4 km likely related to an altered Moho and an underplated layer. We image velocity decreases with depth at depths of 90–190 ± 7 km in some locations that do not geographically correlate with the rift. These include a discontinuity at depths of 90–120 ± 7 km with a northerly dip in the south that abruptly deepens to 150–190 ± 7 km across the Spirit Lake Tectonic Zone provincial suture. The negative phases may represent a patchy, frozen‐in midlithosphere discontinuity feature that likely predates the MCR and/or be related to lithospheric thickness.

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Stratigraphy of the Archean western Superior Province from P- and S-wave receiver functions: Further evidence for tectonic accretion?

Abstract: of the Archean western Superior Province from P-and S-wave receiver functions: further evidence for tectonic accretion?.

Cited by 17 publications

References 45 publications

Distinct crustal isostasy trends east and west of the Rocky Mountain Front

Distinct crustal isostasy trends east and west of the Rocky Mountain Front

Volcanism in the Afar Rift sustained by decompression melting with minimal plume influence

Seismic Imaging of the North American Midcontinent Rift Using S‐to‐P Receiver Functions

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