Term | Value | Language |
---|---|---|
dc.contributor.author | Furmall, Ali Valetta, 1972- | |
dc.date.accessioned | 2010-06-18T01:23:38Z | |
dc.date.available | 2010-06-18T01:23:38Z | |
dc.date.issued | 2010-03 | |
dc.identifier.uri | http://hdl.handle.net/1794/10471 | |
dc.description | xiii, 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.abstract | Excess 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.sponsorship | Committee in charge: Eugene Humphreys, Chair; Emilie Hooft; Mark Reed | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | University of Oregon | en_US |
dc.relation.ispartofseries | University of Oregon theses, Dept. of Geological Sciences, M.S., 2010; | |
dc.title | Melt Production and Ridge Geometry Over the Past 10 Myr on the Southern Kolbeinsey Ridge, Iceland | en_US |
dc.type | Thesis | en_US |