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dc.contributor.authorMontesi, Laurent G. J.  Concept link
dc.contributor.authorBehn, Mark D.  Concept link
dc.date.accessioned2010-04-28T18:06:20Z
dc.date.available2010-04-28T18:06:20Z
dc.date.issued2007-12-25
dc.identifier.citationGeophysical Research Letters 34 (2007): L24307en_US
dc.identifier.urihttps://hdl.handle.net/1912/3347
dc.descriptionAuthor Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 34 (2007): L24307, doi:10.1029/2007GL031067.en_US
dc.description.abstractMid-ocean ridge morphology correlates strongly with spreading rate. As the spreading rate decreases, conductive cooling becomes more important in controlling ridge thermal structure and the axial lithosphere thickens. At ultraslow spreading rates, the ridge axis becomes sufficiently cold that peridotite blocks are emplaced directly at the seafloor and volcanism is limited to localized volcanic centers widely spaced along the ridge axis. Some slow-spreading ridges adopt an ultraslow morphology when their axis is oblique to the spreading direction. We present an analytical solution for mantle flow beneath an oblique ridge and demonstrate that the thermal structure and crustal thickness are controlled by the effective spreading rate (product of the plate separation velocity and the cosine of obliquity). A global compilation of oblique ridges reveals that ultraslow morphology corresponds to effective half rates less than 6.5 mm/yr, resulting in lithosphere that is thicker than ~30 km. We conclude that the transition from slow to ultraslow spreading is not related to a change of melt productivity but rather in the efficiency of vertical melt extraction.en_US
dc.description.sponsorshipThis work was supported by NSF grants OCE-0327588, OCE-0548672, and OCE-0623188, OCE-0649103, the J. Lamar Worzel Assistant Scientist fund to LGJM and the Jessie B. Cox Endowed Fund to MDB.en_US
dc.format.mimetypetext/plain
dc.format.mimetypeapplication/pdf
dc.format.mimetypeapplication/postscript
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2007GL031067
dc.subjectMid-ocean ridgeen_US
dc.subjectMantle flowen_US
dc.subjectMeltingen_US
dc.titleMantle flow and melting underneath oblique and ultraslow mid-ocean ridgesen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2007GL031067


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