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dc.contributor.authorFurmall, Ali Valetta, 1972-
dc.date.accessioned2010-06-18T01:23:38Z
dc.date.available2010-06-18T01:23:38Z
dc.date.issued2010-03
dc.identifier.urihttp://hdl.handle.net/1794/10471
dc.descriptionxiii, 92 p. : ill. (some col.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.en_US
dc.description.abstractExcess melt production due to the interaction between the northern Mid-Atlantic Ridge and the Iceland mantle plume generates anomalously thick oceanic crust. Observed V-shaped gravity anomalies on the Reykjanes Ridge south of Iceland are inferred to reflect changes in melting with a periodicity of 5-6 Ma. A 2-D tomographic inversion of travel times recorded on a seismic refraction line on the Kolbeinsey Ridge north of Iceland constrains crustal velocity and Moho depth. I do not find increased melt production on a 5-6 Ma period, but with a period of ~8-9 Ma, with Moho depth varying from 7.8 - 12.5 ± 0.5 km. Unlike the Reykjanes Ridge, the thickest crust does not correspond with a high gravity anomaly. However, it is a region of slow p-wave velocities and significant decay of magnetic signal. I interpret the V-shaped anomaly in this region to record the northward migration of a ridge segment offset.en_US
dc.description.sponsorshipCommittee in charge: Eugene Humphreys, Chair; Emilie Hooft; Mark Reeden_US
dc.language.isoen_USen_US
dc.publisherUniversity of Oregonen_US
dc.relation.ispartofseriesUniversity of Oregon theses, Dept. of Geological Sciences, M.S., 2010;
dc.titleMelt Production and Ridge Geometry Over the Past 10 Myr on the Southern Kolbeinsey Ridge, Icelanden_US
dc.typeThesisen_US


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