Composition of the crust in the Grenville and Appalachian Provinces of North America inferred from VP/VS ratios

Musacchio, Gemma; Mooney, Walter D.; Luetgert, James H.; Christensen, Nikolas I.

doi:10.1029/96jb03737

Cited by 110 publications

(97 citation statements)

References 47 publications

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“…Poisson's ratio typically varies between 0.20 and 0.35 and is sensitive to the presence of fluids and the crustal mineralogy (mafic versus felsic). For example, a high Poisson's ratio (σ > 0.3) can be interpreted as the presence of fluid (Watanabe 1993), low silica content (Musacchio et al 1997) or anisotropy effects (Hughes et al 1993;Wang et al 2012). Variation in both Poisson's ratio and crustal thickness can be associated with geological features.…”

Section: H-k Stacking Analysismentioning

confidence: 99%

Crustal properties of the northern Scandinavian mountains and Fennoscandian shield from analysis of teleseismic receiver functions

Mansour

England

Fishwick

et al. 2018

Geophysical Journal International

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S U M M A R YThe presence of high mountains along passive margins is not unusual, as shown by their presence in several regions (Scandinavia, Greenland, East US, SW Africa, Brazil, West India and SE Australia). However, the origin of this topography is not well understood. The mountain range between the Scandinavian passive margin and the Fennoscandian shield is a good example. A simple Airy isostatic model would predict a compensating root beneath the mountains but existing seismic measurements of variations in crustal thickness do not provide evidence of a root of sufficient size to produce the necessary compensation. In order to better constrain the physical properties of the crust in northern Scandinavia, two broad-band seismic networks were deployed between 2007 and 2009 and between 2013 and 2014. A new map of crustal thickness has been produced from P-receiver function analysis of teleseismic data recorded at 31 seismic stations. The map shows an increase in crustal thickness from the Atlantic coast (38.7 ± 1.8 km) to the Gulf of Bothnia (43.5 ± 2.4 km). This gradient in thickness demonstrates that the Moho topography does not mirror the variation in surface topography in this region. Thus, classical Airy isostatic models cannot explain how the surface topography is supported. New maps showing variation in Poisson's ratio and Moho sharpness together with forward and inverse modelling provide new information about the contrasting properties of the Fennoscandian shield and crust reworked by the Caledonian orogeny. A sharp Moho transition (R > 1) and low value of V s (3.5 ± 0.2 km s −1 ) are observed beneath the orogen. The shield is characterized by a gradual transition across the Moho (R < 1) and V s of 3.8 ± 0.1 km s −1 which is more typical of average continental crust. These observations are explained by a Fennoscandian shield underplated with a thick layer of high velocity, high density material. It is proposed that this layer has been removed or reworked beneath the orogen.

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Section: H-k Stacking Analysismentioning

confidence: 99%

Crustal properties of the northern Scandinavian mountains and Fennoscandian shield from analysis of teleseismic receiver functions

Mansour

England

Fishwick

et al. 2018

Geophysical Journal International

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“…Using S-wave velocities or Poisson's ratio in addition to P-wave velocities narrows the range of possible rock types in an interpretation (Christensen, 1996). Examples of using S-waves from wide-angle surveys include Gohl and Pedersen (1995), Carbonell et al (1996), Musacchio et al (1997), Darbyshire et al (1998), Stoerzel andSmithson (1998), andFernandez-Viejo et al (2005).…”

Section: S-waves Density Attenuation and Anisotropymentioning

confidence: 96%

Crust and Lithospheric Structure - Active Source Studies of Crust and Lithospheric Structure

Levander

Zelt

Symes

2007

Treatise on Geophysics

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“…Для этого учи-тывались данные лабораторных исследований упругих параметров и результаты сейсмиче-ских экспериментов в активной и пассивной постановках [Holbrook et al, 1992;Rudnik, Fountain, 1995;Christensen, 1996;Musacchio et al, 1997;Wagner et al, 2005;Daly et al, 2008;Liu et al, 2008;Kuo-Chen, 2012]. Известна также зависимость V P /V S от содержания кремнезема Рис.…”

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The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography

Gobarenko

Yegorova

Stephenson³

2014

Geofizicheskiy Zhurnal

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Composition of the crust in the Grenville and Appalachian Provinces of North America inferred from V_P/V_S ratios

Cited by 110 publications

References 47 publications

Crustal properties of the northern Scandinavian mountains and Fennoscandian shield from analysis of teleseismic receiver functions

Crustal properties of the northern Scandinavian mountains and Fennoscandian shield from analysis of teleseismic receiver functions

Crust and Lithospheric Structure - Active Source Studies of Crust and Lithospheric Structure

The structure of the Kerch peninsula and north-eastern part of the Black sea crust according to the results of local seismic tomography

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