1994
DOI: 10.1029/93jb03404
|View full text |Cite
|
Sign up to set email alerts
|

The continent‐ocean crustal transition across the southwest Greenland margin

Abstract: This paper examines the complete crustal transition across the nonvolcanic, southwest Greenland continental margin of the Labrador Sea using wide-angle and coincident verticalincidence seismic profiles. Six ocean bottom seismometers and a sonobuoy record P and S wave first and multiple arrivals from the crust and upper mantle, which are analyzed by two-dimensional dynamic ray tracing and one-dimensional reflectivity modeling. The resulting seismic velocity model requires that the preexisting 30-kin thick conti… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1
1
1

Citation Types

7
112
0

Year Published

1997
1997
2017
2017

Publication Types

Select...
9
1

Relationship

1
9

Authors

Journals

citations
Cited by 120 publications
(119 citation statements)
references
References 37 publications
7
112
0
Order By: Relevance
“…Finally, the measured S wave velocity, if this has been correctly identified, is not consistent with mafic oceanic crest but is nearer the value predicated for partially serpenfinized peridotite [Chian and Louden, 1994]. For these reasons, we suggest that this margin may be amagmatic, analogous to those of the Labrador Sea [Chian et al, 1995] and the Grand Banks [Reid, 1994], and that the 6.8-km/s layer may in fact be serpentinized mantle.…”
Section: Regional Free Air Gravitymentioning
confidence: 96%
“…Finally, the measured S wave velocity, if this has been correctly identified, is not consistent with mafic oceanic crest but is nearer the value predicated for partially serpenfinized peridotite [Chian and Louden, 1994]. For these reasons, we suggest that this margin may be amagmatic, analogous to those of the Labrador Sea [Chian et al, 1995] and the Grand Banks [Reid, 1994], and that the 6.8-km/s layer may in fact be serpentinized mantle.…”
Section: Regional Free Air Gravitymentioning
confidence: 96%
“…We both compare with published surface magnetic data [e.g., Srivastava and Roest, 1999] and crustal seismic profiles [Chian and Louden, 1994; Chian et al, 1995] in order to investigate the limit between unextended buoyant continental crust and very thin (6 km) continental crust [Chalmers and Laursen, 1995], Cretaceous oceanic crust [e.g., Srivastava and Roest, 1999], or else extremely thin (< 2 km) transition crust [Chian et al, 1995].…”
Section: Labrador Seamentioning
confidence: 99%
“…Thin crust overlying a high velocity layer is found on the western margin of Iberia (3-4 km thick above a 7.3 to 7.6 km/s layer, Whitmarsh et al, 1990;Whitmarsh et al, 1993), in the Tagus abyssal Plain (2 km thick above 7.6 km/s layer increasing to 7.9 km/s towards Moho, Pinheiro et al, 1992) and its conjugate Newfoundland margin off Grand Banks (2-3 km thick above 7.2 to 7.7 km/s layer, Reid, 1994), accross Southwest Greenland margin (2.5 km thick above 7.0 to 7.6 km/s layer, Chian and Louden, 1994) and its conjugate Labrador margin (1-2 km thick above a 6.4 to 7.7 km/s layer, Chian et al, 1995) On the southern Newfoundland margin the high velocity body is limited by one or two landward dipping reflectors rising to basement surface seaward and connecting to Moho landward (Keen and de Voogd, 1988;Reid, 1994). The similarity with the T reflector of the Gulf of Lion is striking.…”
Section: Crust At the Ocean-continent Boundarymentioning
confidence: 99%