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dc.contributor.authorTucholke, Brian E.  Concept link
dc.contributor.authorBehn, Mark D.  Concept link
dc.contributor.authorBuck, W. Roger  Concept link
dc.contributor.authorLin, Jian  Concept link
dc.date.accessioned2008-06-04T13:01:10Z
dc.date.available2008-06-04T13:01:10Z
dc.date.issued2008-06
dc.identifier.citationGeology 36 (2008): 455-458en
dc.identifier.urihttps://hdl.handle.net/1912/2248
dc.descriptionAuthor Posting. © Geological Society of America, 2008. This article is posted here by permission of Geological Society of America for personal use, not for redistribution. The definitive version was published in Geology 36 (2008): 455-458, doi:10.1130/G24639A.1.en
dc.description.abstractNormal faults are ubiquitous on mid-ocean ridges and are expected to develop increasing offset with reduced spreading rate as the proportion of tectonic extension increases. Numerous long-lived detachment faults that form megamullions with large-scale corrugations have been identified on magma-poor mid-ocean ridges, but recent studies suggest, counterintuitively, that they may be associated with elevated magmatism. We present numerical models and geological data to show that these detachments occur when ~30%–50% of total extension is accommodated by magmatic accretion and that there is significant magmatic accretion in the fault footwalls. Under these low-melt conditions, magmatism may focus unevenly along the spreading axis to create an irregular brittle-plastic transition where detachments root, thus explaining the origin of the enigmatic corrugations. Morphological and compositional characteristics of the oceanic lithosphere suggested by this study provide important new constraints to assess the distribution of magmatic versus tectonic extension along mid-ocean ridges.en
dc.description.sponsorshipThis research was supported by the National Science Foundation and by the Henry Bryant Bigelow Chair in Oceanography to Tucholke at Woods Hole Oceanographic Institution.en
dc.format.mimetypevideo/avi
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherGeological Society of Americaen
dc.relation.urihttps://doi.org/10.1130/G24639A.1
dc.subjectMid-ocean ridgeen
dc.subjectDetachment faulten
dc.subjectMegamullionen
dc.subjectOceanic core complexen
dc.subjectOceanic magmatismen
dc.subjectNumerical modelingen
dc.titleRole of melt supply in oceanic detachment faulting and formation of megamullionsen
dc.typeArticleen
dc.identifier.doi10.1130/G24639A.1


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