Along‐Strike Variations in Structure of the Continent‐Ocean Transition at the Northeastern Nova Scotia Margin From Wide‐Angle Seismic Observations

Our 2‐D‐layered velocity model along strike northeastern Nova Scotian margin, constrained by wide‐angle seismic Profile OCTOPUS and coincident 9‐km streamer Profile GXT‐5100, displays highly variable basement structures interpreted to define four distinct zones within the continent‐ocean transition:...

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Veröffentlicht in:	Journal of geophysical research. Solid earth 2019-03, Vol.124 (3), p.3172-3196
Hauptverfasser:	Lau, K. W. Helen, Nedimović, Mladen R., Louden, Keith E.
Format:	Artikel
Sprache:	eng
Schlagworte:	amagmatic continental extension Continental crust continent‐ocean transition Embryos Geophysics layered seismic velocity model Magma Mantle Mapping Marine molluscs Nova Scotia rifted margin Oceanic crust Oceans Profiles Seismic activity Seismic analysis Seismic profiles serpentinized mantle Velocity Velocity gradient Velocity gradients Vertical velocities Wavelength wide‐angle seismic Width
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Zusammenfassung:	Our 2‐D‐layered velocity model along strike northeastern Nova Scotian margin, constrained by wide‐angle seismic Profile OCTOPUS and coincident 9‐km streamer Profile GXT‐5100, displays highly variable basement structures interpreted to define four distinct zones within the continent‐ocean transition: Zone I, with thin (1–2 km) and laterally uniform upper crust (5.2–5.5 km/s) and high‐velocity lower crust (6.5–7.7 km/s); Zone II, with velocities of 5.5–7.5 km/s and a high vertical velocity gradient (∼1.1/s) characteristic of exhumed serpentinized (up to 90%) mantle (ESM) above ∼3.5‐km‐thick slightly (
ISSN:	2169-9313 2169-9356
DOI:	10.1029/2018JB016894