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dc.contributor.authorDannowski, A.-
dc.contributor.authorGrevemeyer, Ingo-
dc.contributor.authorMorgan, J. Phipps-
dc.contributor.authorRanero, César R.-
dc.contributor.authorMaia, M.-
dc.contributor.authorKlein, G.-
dc.identifier.citationGeochemistry, geophysics, geosystems 12(7): Q07012 (2012)es_ES
dc.description18 pages, 8 figureses_ES
dc.description.abstractActive ridge propagation frequently occurs along spreading ridges and profoundly affects ridge crest segmentation over time. The mechanisms controlling ridge propagation, however, are poorly understood. At the slow spreading Mid-Atlantic Ridge at 21.5°N a seismic refraction and wide-angle reflection profile surveyed the crustal structure along a segment controlled by rapid ridge propagation. Tomographic traveltime inversion of seismic data suggests that the crustal structure along the ridge axis is controlled by melt supply; thus, crust is thickest, 8 km, at the domed segment center and decreases in thickness toward both segment ends. However, thicker crust is formed in the direction of ridge propagation, suggesting that melt is preferentially transferred toward the propagating ridge tip. Further, while seismic layer 2 remains constant along axis, seismic layer 3 shows profound changes in thickness, governing variations in total crustal thickness. This feature supports mantle upwelling at the segment center. Thus, fluid basaltic melt is redistributed easily laterally, while more viscose gabbroic melt tends to crystallize and accrete nearer to the locus of melt supply. The onset of propagation seems to have coincided with the formation of thicker crust, suggesting that propagation initiation might be due to changes in the melt supply. After a rapid initiation a continuous process of propagation was established. The propagation rate seems to be controlled by the amount of magma that reaches the segment ends. The strength of upwelling may govern the evolution of ridge segments and hence ultimately controls the propagation lengthes_ES
dc.description.sponsorshipThe COSTMAR experiment was funded by the Deutsche Forschungsgemeinschaft (DFG), grants Mo 961/5-1, Ra 925/5-1, and Gr 1964/8-2+8-3es_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.subjectCrustal structurees_ES
dc.subjectMid‐ocean ridgeses_ES
dc.subjectRidge propagationes_ES
dc.subjectSeismic traveltime tomographyes_ES
dc.titleCrustal structure of the propagating TAMMAR ridge segment on the Mid‐Atlantic Ridge, 21.5°Nes_ES
dc.description.peerreviewedPeer reviewedes_ES
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