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 |