A reconnaissance teleseismic study of the upper mantle and transition zone beneath the Archean Slave craton in NW Canada

Bank, Carl‐Georg; Bostock, M. G.; Ellis, Robert M.; Cassidy, John F.

doi:10.1016/s0040-1951(00)00034-2

Cited by 73 publications

(48 citation statements)

References 54 publications

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“…Previous estimates of crustal thickness from within the Slave craton show a northwest-southeast pattern, with a thickening trend from ∼37 km in the northwest to ∼42 km in the southeast (Bank et al, 2000;Davis et al, 2003). A similar pattern is also evident from the new estimates of crustal thickness presented here (Fig.…”

Section: Slave Cratonsupporting

confidence: 87%

CAN‐HK: An a Priori Crustal Model for the Canadian Shield

Thompson

Kendall

Helffrich

et al. 2015

Seismological Research Letters

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Section: Slave Cratonsupporting

confidence: 87%

CAN‐HK: An a Priori Crustal Model for the Canadian Shield

Thompson

Kendall

Helffrich

et al. 2015

Seismological Research Letters

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“…I identify the boundaries of cratons that could act as trigger points for edge-driven convection. Seismic velocities under Archean cratons are signifi cantly faster than normal subcontinental mantle (e.g., Polet and Anderson, 1995;Bank et al, 2000;Ritsema and van Heijst, 2000;James et al, 2001;James and Fouch, 2002;Kendall et al, 2002), suggesting that the mantle beneath Archean cratons is cold and melt depleted (Jordan, 1978;James et al, 2004). Cold, melt-depleted, and dry roots should mechanically be high viscosity and low density, both of which are key to stabilizing cratonic roots (Lenardic and Moresi, 1999;Shapiro et al, 1999;Lenardic et al, 2003;Cooper et al, 2004).…”

Section: Methodsmentioning

confidence: 99%

Hotspots and edge-driven convection

King

2007

Geol

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Not every hotspot may be related to a deep-mantle plume, and there are a number of examples of intraplate volcanism that have never been suggested to be related to a mantle plume. The mechanism of origin for these intraplate volcanic events remains poorly understood; however, small-scale convection triggered at the edge of a continent or craton is one proposed mechanism. Drawing 600 and 1000 km circles around hotspots, a distance based on the scalelength of convective fl ow, and looking for circles that intersect cratonic roots discriminates between hotspots that are potentially generated by edge-driven convection and those that are not. The group of hotspots unfavorable for edge-driven convection agrees with other groups of proposed mantle plume hotspots.

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“…The Slave craton is an attractive scientific target because it is well exposed and preserved, and because its underlying mantle is sampled by more than 150 kimberlite pipes (Heaman et al 1997) that provide petrological constraints on the entire lithospheric column. The Slave craton has been the subject of extensive geophysical investigations (e.g., Bostock 1997Bostock , 1998Bank et al 2000;Snyder et al 2003Snyder et al , 2004Chen et al 2007Chen et al , 2009Mercier et al 2008). For the purpose of this discussion, we will focus on results from magnetotelluric and seismic receiver function studies.…”

Section: Archean Cratonsmentioning

confidence: 99%

Mapping the Distribution of Fluids in the Crust and Lithospheric Mantle Utilizing Geophysical Methods

Unsworth

Rondenay

2012

Lecture Notes in Earth System Sciences

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Geophysical imaging provides a unique perspective on metasomatism, because it allows the present day fluid distribution in the Earth's crust and upper mantle to be mapped. This is in contrast to geological studies that investigate midcrustal rocks have been exhumed and fluids associated with metasomatism are absent. The primary geophysical methods that can be used are (a) electromagnetic methods that image electrical resistivity and (b) seismic methods that can measure the seismic velocity and related quantities such as Poisson's ratio and seismic anisotropy. For studies of depths in excess of a few kilometres, the most effective electromagnetic method is magnetotellurics (MT) which uses natural electromagnetic signals as an energy source. The electrical resistivity of crustal rocks is sensitive to the quantity, salinity and degree of interconnection of aqueous fluids. Partial melt and hydrogen diffusion can also cause low electrical resistivity. The effects of fluid and/or water on seismic observables are assessed by rock and mineral physics studies. These studies show that the presence of water generally reduces the seismic velocities of rocks and minerals. The water can be present as a fluid, in hydrous minerals, or as hydrogen point defects in nominally anhydrous minerals. Water can further modify seismic properties such as the Poisson's ratio, the quality factor, and anisotropy. A variety of seismic analysis methods are employed to measure these effects in situ in the crust and lithospheric mantle and include seismic tomography, seismic reflection, passive-source converted and scattered wave imaging, and shear-wave splitting analysis. A combination of magnetotelluric and seismic data has proven an effective tool to study the fluid

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A reconnaissance teleseismic study of the upper mantle and transition zone beneath the Archean Slave craton in NW Canada

Cited by 73 publications

References 54 publications

CAN‐HK: An a Priori Crustal Model for the Canadian Shield

CAN‐HK: An a Priori Crustal Model for the Canadian Shield

Hotspots and edge-driven convection

Mapping the Distribution of Fluids in the Crust and Lithospheric Mantle Utilizing Geophysical Methods

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