Repository logo
 

Crustal structure of the northern Nova Scotia rifted continental margin (eastern Canada)

dc.contributor.authorFunck, T.en_US
dc.contributor.authorJackson, HRen_US
dc.contributor.authorLouden, KEen_US
dc.contributor.authorDehler, SAen_US
dc.contributor.authorWu, Y.en_US
dc.date.accessioned2013-06-19T18:01:13Z
dc.date.available2013-06-19T18:01:13Z
dc.date.issued2004-09en_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.citationFunck, 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:10.1029/2004JB003008en_US
dc.identifier.issn0148-0227en_US
dc.identifier.issue9en_US
dc.identifier.startpage09102en_US
dc.identifier.urihttp://dx.doi.org/10.1029/2004JB003008en_US
dc.identifier.urihttp://hdl.handle.net/10222/26941
dc.identifier.volume109en_US
dc.relation.ispartofJournal of Geophysical Research-Solid Earthen_US
dc.rights.holderThis paper was published by AGU. Copyright 2004 American Geophysical Union
dc.titleCrustal structure of the northern Nova Scotia rifted continental margin (eastern Canada)en_US
dc.typearticleen_US

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Funck_et_al-2004-Journal_of_Geophysical_Research__Solid_Earth_(1978-2012).pdf
Size:
3.51 MB
Format:
Adobe Portable Document Format
Description:

Collections