georefid:2006-058392SEDIS Publication Catalogue
ana.macario@awi.de
http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-07-06T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1007/s11001-005-1338-8<gco:CharacterString>The Agulhas Ridge, South Atlantic; the peculiar structure of a fracture zone</gco:CharacterString>2004-01-01publicationgeorefid:2006-058392doi:10.1007/s11001-005-1338-8Uenzelmann-Neben, GabrieleAlfred Wegener Institute for Polar and Marine Research, Bremerhaven, Federal Republic of GermanyauthorGohl, KarstenauthorSpringer, Dordrecht, NetherlandspublisherdocumentHardcopyIn: Jokat, Wilfried (editor), East Antarctic tectonics and sedimentation history from 40 degrees W to 60 degrees E25 (3-4)305-319The Agulhas Ridge is a prominent topographic feature that parallels the Agulhas-Falkland Fracture Zone (AFFZ). Seismic reflection and wide angle/refraction data have led to the classification of this feature as a transverse ridge. Changes in spreading rate and direction associated with ridge jumps, combined with asymmetric spreading within the Agulhas Basin, modified the stress field across the fracture zone. Moreover, passing the Agulhas Ridge's location between 80 and 69 Ma, the Bouvet and Shona Hotspots may have supplied excess material to this part of the AFFZ thus altering the ridge's structure. The low crustal velocities and over-thickened crust of the northern Agulhas Ridge segment indicate a possible continental affinity that suggests it may be formed by a small continental sliver, which was severed off the Maurice Ewing Bank during the opening of the South Atlantic. (mod. journ. abst.)completedSolid-earth geophysicsApplied geophysicsAgulhas BankAgulhas-Falkland fracture zoneAtlantic OceanCape BasinCenozoiccompressionDiscovery Hot SpotextensionFalkland Plateaufaultsfracture zonesgeophysical methodshot spotsIndian OceanLeg 177mantlemantle plumesMaurice Ewing Bankmid-ocean ridgesOcean Drilling Programocean floorsOligocenePaleogeneplate tectonicsreflection methodsrefraction methodssea-floor spreadingseismic methodsShona hot spotSouth Atlanticspreading centersstrike-slip faultsTertiarytransform faultstransverse faultsupliftsurn:org.iodp:exp:177urnlargerWorkCitationcampaignEnglishgeoscientificInformation-5.000025.0000-55.0000-35.0000