Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5982f&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5982
Computer Science
Scientific paper
The Nova Scotia margin off the East coast of Canada marks the transition from volcanic style margins to the south (US East Coast) to non-volcanic margins to the north (Newfoundland and Labrador). The SMART (Scotian MARgin Transects) experiment was carried out in 2001 to study the northward decrease of volcanic activity along the margin by means of three refraction/wide-angle reflection seismic lines. Line 1 is coincident to two deep MCS lines (GSC 89-1, BGR 89-12) and extends 490 km seaward off Cape Breton Island. 19 ocean bottom seismometers (OBS) were deployed along the line recording shots from a tuned airgun array (volume of 104 litres) with a shot spacing of 130 m. The maximum thickness of the continental crust is 37 km. Seaward of the hinge zone, the syn- and postrift sediments have a thickness of up to 15 km. A 145-km wide zone with partially serpentinized mantle (P-wave velocities of 7.2 to 7.6 km/s) separates the thinned continental crust from oceanic crust. This partially serpentinized mantle is overlain by highly altered and thinned continental crust (3 km thickness) in the NW, and by a 2-km thick layer with a velocity of 5.1 km/s in the SE, which is interpreted to be highly serpentinized mantle. The seaward limit of the continental crust correlates with the disappearance of synrift age salt in the Sedimentary Ridge Province. Comparison with line 2 (line spacing ca. 200 km) indicates that the zone with unroofed mantle narrows to the SW. Serpentinized mantle in the transition zone of line 2 seems to be overlain by thin oceanic/basaltic crust. The thickness of the oceanic crust at the seaward end of the lines decreases from 6 km on line 2 to 4 km on line 1. This indicates the decrease of magma generation as the prograding rift was reaching the Newfoundland transform margin. The French SISMAR experiment in 2001 was carried out on the conjugate NW-Moroccan margin. SISMAR line 4 is only 60 km to the north of SMART line 1 in the plate reconstruction. Both lines are very similar in the amount of crustal extension and the width of the transitional crust.
Dehler Sonya A.
Funck Thomas
Jackson Ruth H.
Louden Keith E.
Wu Yihong
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