1993
DOI: 10.1029/92jb02863
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Deformation of the oceanic crust between the North American and South American Plates

Abstract: Fracture zone trends and magnetic anomalies in the Atlantic Ocean indicate that the North American plate must have moved with respect to the South American plate during the opening of the Atlantic. A comparison of plate tectonic flow lines with fracture zones identified from Geosat and Seasat altimeter data suggests that the North American‐South American plate boundary migrated northward from die Guinea‐Demarara shear margin to the Vema Fracture Zone before chron 34 (84 Ma), to north of the Doldrums Fracture Z… Show more

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Cited by 51 publications
(42 citation statements)
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“…1), away from SMAR. The implied location of the boundary between SMAR and CMAR is consistent with the Equatorial Atlantic Region (EAR), an area characterized by a dense pattern of mostly medium to large offset fracture zones (Mueller and Smith, 1993). The EAR records a plate boundary between the North and South American plates (Roest and Collette, 1986) that seems has been in existence for the last 80 Ma.…”
Section: Migration Of Global Mid-ocean Ridgesmentioning
confidence: 62%
“…1), away from SMAR. The implied location of the boundary between SMAR and CMAR is consistent with the Equatorial Atlantic Region (EAR), an area characterized by a dense pattern of mostly medium to large offset fracture zones (Mueller and Smith, 1993). The EAR records a plate boundary between the North and South American plates (Roest and Collette, 1986) that seems has been in existence for the last 80 Ma.…”
Section: Migration Of Global Mid-ocean Ridgesmentioning
confidence: 62%
“…Alternatively, the basement high could have been formed by buckling of oceanic crust caused by transpressive forces along fracture zones in the area. In this case we would observe a Moho uplift underneath the high [Müller and Smith, 1993]. However, the two velocity and density models of the NE basement high (Figures 15a and 17a) have minimum crustal thicknesses of 7 -9 km and no apparent Moho uplift.…”
Section: Crustal Structure Of Egr and The Adjacent Ne Fault Provincementioning
confidence: 86%
“…The lack of curvature of the trench at this time is also attested by the linear, north-south trending Aves Ridge, the remnant of a Palaeocene-Eocene arc (Bouysse et al, 1988). In as much as the north-south Americas/ Caribbean plate motion do not changed significantly during the Cainozoic (Müller and Smith, 1993), the obliquity of the subduction was probably not so pronounced at this time, thus poorly efficient to induce trench parallel extension in the fore-arc. Alternatively, since the collision of the Bahamas bank in the late Paleogene, the Lesser Antilles subduction zone curvature greatly increased (e.g., Pindell and Kennan, 2009;Escalona and Mann, 2011).…”
Section: Origin Of Sub-meridian Extension In the Fore Arcmentioning
confidence: 92%
“…Such a process is suggested to explain the large and fast subsidence at the Porto-Rico trench (ten Brink, 2005) whereas, first, McCann and Sykes (1984) proposed margin erosion. A mechanism for a steepening of the slab dip responsible for the Karukéra long term subsidence could be the slow convergence between South and North Americas in the vicinity of the Karukéra margin and that would force the two lithospheres to flex downward (Müller and Smith, 1993;Patriat et al, 2011;Pichot et al, 2012). However such a steepening of the downgoing lithosphere would rather drive the volcanic arc seaward than landward.…”
Section: Origin Of the General Subsidence And The Trench Perpendiculamentioning
confidence: 93%