Variation of the subsidence parameters, effective thermal conductivity, and mantle dynamics

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dc.contributor.authorAdam, Claudiaen
dc.contributor.authorKing, Scott D.en
dc.contributor.authorVidal, Valérieen
dc.contributor.authorRabinowicz, Michelen
dc.contributor.authorJalobeanu, Andréen
dc.contributor.authorYoshida, Masakien
dc.date.accessioned2021-04-14T16:08:00Zen
dc.date.available2021-04-14T16:08:00Zen
dc.date.issued2015-09-15en
dc.date.updated2021-04-14T16:07:45Zen
dc.description.abstractThe subsidence of young seafloor is generally considered to be a passive phenomenon related to the conductive cooling of the lithosphere after its creation at mid-oceanic ridges. Recent alternative theories suggest that the mantle dynamics plays an important role in the structure and depth of the oceanic lithosphere. However, the link between mantle dynamics and seafloor subsidence has still to be quantitatively assessed. Here we provide a statistical study of the subsidence parameters (subsidence rate and ridge depth) for all the oceans. These parameters are retrieved through two independent methods, the positive outliers method, a classical method used in signal processing, and through the MiFil method. From the subsidence rate, we compute the effective thermal conductivity, k , which ranges between 1 and 7 W m K . We also model the mantle flow pattern from the S40RTS tomography model. The density anomalies derived from S40RTS are used to compute the instantaneous flow in a global 3D spherical geometry. We show that departures from the k =3 Wm K standard value are systematically related to mantle processes and not to lithospheric structure. Regions characterized by k >3 Wm K are associated with mantle uplifts (mantle plumes or other local anomalies). Regions characterized by k <3 Wm K are related to large-scale mantle downwellings such as the Australia-Antarctic Discordance (AAD) or the return flow from the South Pacific Superswell to the East Pacific Rise. This demonstrates that mantle dynamics plays a major role in the shaping of the oceanic seafloor. In particular, the parameters generally considered to quantify the lithosphere structure, such as the thermal conductivity, are not only representative of this structure but also incorporate signals from the mantle convection occurring beneath the lithosphere. The dynamic topography computed from the S40RTS tomography model reproduces the subsidence pattern observed in the bathymetry. Overall we find a good correlation between the subsidence parameters derived from the bathymetry and the dynamic topography. This demonstrates that these parameters are strongly dependent on mantle dynamics.en
dc.description.versionPublished (Publication status)en
dc.format.extentPages 130-142en
dc.format.extent13 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1016/j.epsl.2015.06.025en
dc.identifier.eissn1385-013Xen
dc.identifier.issn0012-821Xen
dc.identifier.orcidKing, Scott [0000-0002-9564-5164]en
dc.identifier.otherCO3CE (isidoc)en
dc.identifier.urihttp://hdl.handle.net/10919/103027en
dc.identifier.volume426en
dc.language.isoenen
dc.publisherElsevieren
dc.rightsIn Copyright (InC)en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectPhysical Sciencesen
dc.subjectGeochemistry & Geophysicsen
dc.subjectseafloor subsidenceen
dc.subjectsubsidence rateen
dc.subjectridge depthen
dc.subjecteffective thermal conductivityen
dc.subjectmantle dynamicsen
dc.subjectdynamic topographyen
dc.subjectRIDGE BASALT CHEMISTRYen
dc.subjectSEA-LEVELen
dc.subjectGLOBAL CORRELATIONSen
dc.subjectAXIAL DEPTHen
dc.subjectTOPOGRAPHYen
dc.subjectPACIFICen
dc.subjectMODELSen
dc.subjectFLOORen
dc.subjectOCEANen
dc.subjectAGEen
dc.subject02 Physical Sciencesen
dc.subject04 Earth Sciencesen
dc.subjectGeochemistry & Geophysicsen
dc.titleVariation of the subsidence parameters, effective thermal conductivity, and mantle dynamicsen
dc.title.serialEarth and Planetary Science Lettersen
dc.typeArticle - Refereeden
dc.type.otherArticleen
dc.type.otherJournalen
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/Geosciencesen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen
pubs.organisational-group/Virginia Techen

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