Seismic structure of an oceanic core complex at the Mid-Atlantic Ridge, 22°19′N
15 pages, 9 figures
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American Geophysical Union
2010-07-24
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dig-icm-es-10261-802942020-12-09T16:17:14Z Seismic structure of an oceanic core complex at the Mid-Atlantic Ridge, 22°19′N Dannowski, A. Grevemeyer, Ingo Ranero, César R. Ceuleneer, Georges Maia, M. Morgan, J. Phipps Gente, Pascal 15 pages, 9 figures We present results from a seismic refraction and wide-angle experiment surveying an oceanic core complex on the Mid-Atlantic Ridge at 2219N. Oceanic core complexes are settings where petrological sampling found exposed lower crustal and upper mantle rocks, exhumed by asymmetric crustal accretion involving detachment faulting at magmatically starved ridge sections. Tomographic inversion of our seismic data yielded lateral variations of P wave velocity within the upper 3 to 4 km of the lithosphere across the median valley. A joint modeling procedure of seismic P wave travel times and marine gravity field data was used to constrain crustal thickness variations and the structure of the uppermost mantle. A gradual increase of seismic velocities from the median valley to the east is connected to aging of the oceanic crust, while a rapid change of seismic velocities at the western ridge flank indicates profound differences in lithology between conjugated ridge flanks, caused by un-roofing lower crust rocks. Under the core complex crust is approximately 40% thinner than in the median valley and under the conjugated eastern flank. Clear PmP reflections turning under the western ridge flank suggest the creation of a Moho boundary and hence continuous magmatic accretion during core complex formation The research was funded by the German Science Foundation (DFG) (grants Mo 961‐5/1 Ra 925‐5/1 Gr 1964‐8/2+8/3) Peer Reviewed 2013-07-30T06:55:30Z 2013-07-30T06:55:30Z 2010-07-24 2013-07-30T06:55:32Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1029/2009JB006943 e-issn: 2169-9356 Journal of Geophysical Research: Solid Earth 115(B7): B07106 (2010) http://hdl.handle.net/10261/80294 10.1029/2009JB006943 en https://doi.org/10.1029/2009JB006943 open American Geophysical Union |
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English |
| description |
15 pages, 9 figures |
| format |
artículo |
| author |
Dannowski, A. Grevemeyer, Ingo Ranero, César R. Ceuleneer, Georges Maia, M. Morgan, J. Phipps Gente, Pascal |
| spellingShingle |
Dannowski, A. Grevemeyer, Ingo Ranero, César R. Ceuleneer, Georges Maia, M. Morgan, J. Phipps Gente, Pascal Seismic structure of an oceanic core complex at the Mid-Atlantic Ridge, 22°19′N |
| author_facet |
Dannowski, A. Grevemeyer, Ingo Ranero, César R. Ceuleneer, Georges Maia, M. Morgan, J. Phipps Gente, Pascal |
| author_sort |
Dannowski, A. |
| title |
Seismic structure of an oceanic core complex at the Mid-Atlantic Ridge, 22°19′N |
| title_short |
Seismic structure of an oceanic core complex at the Mid-Atlantic Ridge, 22°19′N |
| title_full |
Seismic structure of an oceanic core complex at the Mid-Atlantic Ridge, 22°19′N |
| title_fullStr |
Seismic structure of an oceanic core complex at the Mid-Atlantic Ridge, 22°19′N |
| title_full_unstemmed |
Seismic structure of an oceanic core complex at the Mid-Atlantic Ridge, 22°19′N |
| title_sort |
seismic structure of an oceanic core complex at the mid-atlantic ridge, 22°19′n |
| publisher |
American Geophysical Union |
| publishDate |
2010-07-24 |
| url |
http://hdl.handle.net/10261/80294 |
| work_keys_str_mv |
AT dannowskia seismicstructureofanoceaniccorecomplexatthemidatlanticridge2219n AT grevemeyeringo seismicstructureofanoceaniccorecomplexatthemidatlanticridge2219n AT ranerocesarr seismicstructureofanoceaniccorecomplexatthemidatlanticridge2219n AT ceuleneergeorges seismicstructureofanoceaniccorecomplexatthemidatlanticridge2219n AT maiam seismicstructureofanoceaniccorecomplexatthemidatlanticridge2219n AT morganjphipps seismicstructureofanoceaniccorecomplexatthemidatlanticridge2219n AT gentepascal seismicstructureofanoceaniccorecomplexatthemidatlanticridge2219n |
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1777665934000914432 |