Crustal structure of the northern Nova Scotia rifted continental margin (eastern Canada)
dc.contributor.author | Funck, T. | en_US |
dc.contributor.author | Jackson, HR | en_US |
dc.contributor.author | Louden, KE | en_US |
dc.contributor.author | Dehler, SA | en_US |
dc.contributor.author | Wu, Y. | en_US |
dc.date.accessioned | 2013-06-19T18:01:13Z | |
dc.date.available | 2013-06-19T18:01:13Z | |
dc.date.issued | 2004-09 | en_US |
dc.description.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 a maximum thickness of 36 km and is divided into three layers with velocities of 5.7 - 6.9 km/s. Crustal thinning down to 3 km occurs in a 180-km-wide zone and the sediment cover in this area is up to 15 km thick. Farther seaward, a 150-km-wide transition zone is observed with a 5-km-thick lower layer (7.2 - 7.6 km/s) interpreted as partially serpentinized mantle. At the landward end, this layer is overlain by highly altered continental crust (5.4 km/s) extending up to the seaward limit of the Jurassic salt province. Farther seaward, the upper layer is interpreted as exhumed and highly serpentinized mantle (5.1 km/s) separated from the lower layer by subhorizontal reflectivity, which probably represents a serpentinization front. Oceanic crustal thickness is 4 km with layer 2 velocities of 4.6 - 5.0 km/s. Layer 3 velocities of 6.4 - 6.55 km/s are lower than typical lower oceanic crust velocities but consistent with a low magma supply and increased tectonism as observed on the reflection profile. This reduced magma production might be related to the proximity of the Newfoundland transform margin. | en_US |
dc.identifier.citation | Funck, T., HR Jackson, KE Louden, SA Dehler, et al. 2004. "Crustal structure of the northern Nova Scotia rifted continental margin (eastern Canada)." Journal of Geophysical Research-Solid Earth 109(B9): 09102-B09102. DOI:10.1029/2004JB003008 | en_US |
dc.identifier.issn | 0148-0227 | en_US |
dc.identifier.issue | 9 | en_US |
dc.identifier.startpage | 09102 | en_US |
dc.identifier.uri | http://dx.doi.org/10.1029/2004JB003008 | en_US |
dc.identifier.uri | http://hdl.handle.net/10222/26941 | |
dc.identifier.volume | 109 | en_US |
dc.relation.ispartof | Journal of Geophysical Research-Solid Earth | en_US |
dc.rights.holder | This paper was published by AGU. Copyright 2004 American Geophysical Union | |
dc.title | Crustal structure of the northern Nova Scotia rifted continental margin (eastern Canada) | en_US |
dc.type | article | en_US |
Files
Original bundle
1 - 1 of 1
Loading...
- Name:
- Funck_et_al-2004-Journal_of_Geophysical_Research__Solid_Earth_(1978-2012).pdf
- Size:
- 3.51 MB
- Format:
- Adobe Portable Document Format
- Description: