Show simple item record

dc.contributor.authorMarjanovic, Milena  Concept link
dc.contributor.authorCarbotte, Suzanne M.  Concept link
dc.contributor.authorNedimovic, Mladen R.  Concept link
dc.contributor.authorCanales, J. Pablo  Concept link
dc.date.accessioned2011-06-06T18:12:13Z
dc.date.available2011-11-17T09:29:01Z
dc.date.issued2011-05-17
dc.identifier.citationGeochemistry Geophysics Geosystems 12 (2011): Q05008en_US
dc.identifier.urihttps://hdl.handle.net/1912/4638
dc.descriptionAuthor Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 12 (2011): Q05008, doi:10.1029/2010GC003439.en_US
dc.description.abstractVariations in topography and seismic structure are observed along the Juan de Fuca (JdF) Ridge axis and in the vicinity of pseudofaults on the ridge flanks left by former episodes of ridge propagation. Here we analyze gravity data coregistered with multichannel seismic data from the JdF Ridge and flanks in order to better understand the origin of crustal structure variations in this area. The data were collected along the ridge axis and along three ridge-perpendicular transects at the Endeavor, Northern Symmetric, and Cleft segments. Negative Mantle Bouguer anomalies of −21 to −28 mGal are observed at the axis of the three segments. Thicker crust at the Endeavor and Cleft segments is inferred from seismic data and can account for the small differences in axial gravity anomalies (3–7 mGal). Additional low densities/elevated temperatures within and/or below the axial crust are required to explain the remaining axial MBA low at all segments. Gravity models indicate that the region of low densities is wider beneath the Cleft segment. Gravity models for pseudofaults crossed along the three transects support the presence of thinner and denser crust within the pseudofault zones that we attribute to iron-enriched crust. On the young crust side of the pseudofaults, a 10–20 km wide zone of thicker crust is found. Reflection events interpreted as subcrustal sills underlie the zones of thicker crust and are the presumed source for the iron enrichment.en_US
dc.description.sponsorshipThis work was supported by the National Science Foundation grants OCE‐0648303 to Lamont‐Doherty Earth Observatory, OCE‐0648923 to Woods Hole Oceanographic Institution.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2010GC003439
dc.subjectMid-ocean ridgesen_US
dc.subjectPropagationen_US
dc.subjectJuan de Fuca Ridgeen_US
dc.subjectGravityen_US
dc.titleGravity and seismic study of crustal structure along the Juan de Fuca Ridge axis and across pseudofaults on the ridge flanksen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2010GC003439


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record