2004
DOI: 10.1029/2004jb003008
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Crustal structure of the northern Nova Scotia rifted continental margin (eastern Canada)

Abstract: [1] The Nova Scotia continental margin off eastern Canada marks a transition from a volcanic to a nonvolcanic style of rifting. The northern (nonvolcanic) segment of the margin was studied by a 490-km-long refraction seismic line with dense air gun shots, coincident with previous deep reflection profiles. A P wave velocity model was developed from forward and inverse modeling of the wide-angle data from 19 ocean bottom seismometers and coincident normal incidence reflection profiles. The continental crust has … Show more

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Cited by 109 publications
(161 citation statements)
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“…An abrupt transition is not observed on either line, but the rise of the Moho from 26 to 22 km on line P2 and from 27 km (Weber et al, 2004) near Gaza to 22 km on line P1 could mark a zone with a gradual transition from continental to oceanic crust. Such a transition zone has been observed elsewhere, e.g., at the Hatton margin offshore Ireland (Vogt et al, 1998), at the Flemish Cap off New Foundland (Funck et al, 2004) and in Nova Scotia (Funck et al, 2004). In Nova Scotia and at the Flemish Cap ,the transition zones are characterized by an extremely thinned crust of 2-3km overlying serpentinized mantle with 7.2-7.6km/s (Nova Scotia) or 7.7-7.9 km/s (Flemish Cap).…”
Section: Velocity Distribution and Crustal Structurementioning
confidence: 93%
“…An abrupt transition is not observed on either line, but the rise of the Moho from 26 to 22 km on line P2 and from 27 km (Weber et al, 2004) near Gaza to 22 km on line P1 could mark a zone with a gradual transition from continental to oceanic crust. Such a transition zone has been observed elsewhere, e.g., at the Hatton margin offshore Ireland (Vogt et al, 1998), at the Flemish Cap off New Foundland (Funck et al, 2004) and in Nova Scotia (Funck et al, 2004). In Nova Scotia and at the Flemish Cap ,the transition zones are characterized by an extremely thinned crust of 2-3km overlying serpentinized mantle with 7.2-7.6km/s (Nova Scotia) or 7.7-7.9 km/s (Flemish Cap).…”
Section: Velocity Distribution and Crustal Structurementioning
confidence: 93%
“…An example of such a margin is the eastern Nova Scotia margin sampled by profile SMART1 (Fig. 1) [35]. Here, velocities of >7.0 km/s are reached only ~2 km beneath top basement and the adjacent oceanic crust is not unusually thick, but normal mantle velocities are not reached until 7-8 km beneath top basement.…”
Section: P-wave Velocity Structurementioning
confidence: 99%
“…To first order, the large-scale synrift geometry of a rifted margin will depend on the distribution of lithospheric extension across the margin. In designing the models we assume that (1) lithospheric extension is uniform with depth, (2) the extension varies across the 200 km margin in an approximately linear manner that is consistent with crustal models developed by Keen and Potter [1995], Funck et al [2004], and Wu et al [2006], and (3) the stretched margin is in isostatic equilibrium in a configuration determined by the thickness, density and thermal state of the extended lithosphere. Synrift salt and clastic sediments load the margin and the system is flexurally isostatically balanced in a submarine configuration including loading by the water.…”
Section: Initial Configuration Of the Model Continental Margin And Samentioning
confidence: 99%
“…We chose h cc = 35 km, h oc = 6.5 km, and densities r cc = r oc = 2860 kg m −3 , and r cm = r om = 3225 kg m −3 , which allows the depth of the top of the oceanic crust to be calculated. Corresponding depths across the margin, assumed to be 200 km wide between positions X 1 and X 2 (a geometry consistent with recent seismic refraction surveys [Keen and Potter, 1995;Funck et al, 2004;Wu et al, 2006]), are calculated by linear interpolation because the lithosphere is assumed to thin linearly across the margin.…”
Section: Appendix B: Parameterized Model For Lithospheric Isostasy Anmentioning
confidence: 99%