Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"earth's mantle"”.
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Hydrous melt generation in the Earth's mantle
… of H₂O in the generation and modification of mantle melts at shallow pressures in subduction zones. In the first and second chapters, two experimental studies are presented that investigate direct mantle melting and then subsequent reaction of deeper mantle melts with overlying, cooler …
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Lateral variations of density in the earth's mantle,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1969.
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Geochemical Implications of Stirring and Mixing in the Earth's Mantle
… and solid state convection that occurs in the Earth's mantle, but to do so requires suitable quantitative models. A new statistical model is introduced to better understand the observed heterogeneity in isotopic ratios 143Nd/144Nd, 87Sr/86Sr, 176Hf/177Hf,208Pb/204Pb, 206Pb/204Pb and 207Pb/204Pb …
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The structure of the earth's mantle from body wave observations.
… Institute of Technology. Dept. of Earth and Planetary Sciences.
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Elastic and viscous anisotropy in Earth's mantle : observations and implications
… seismic anisotropy to detect deformation in the mantle, and I demonstrate the importance of accounting for rheological anisotropy in mantle flow models. The observations of seismic anisotropy in the Earth's interior allow geophysicists to probe the direction and mechanism of deformation, through …
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Melt generation in the Earth's mantle at Convergent Plate Margins
… a profound effect on the melting behavior of the Earth's mantle. Two experimental studies (Chapters 1 and 2) of the melting behavior of mantle peridotite demonstrate that the forefathers of arc magmas are formed at extremely low temperatures in the mantle wedge at convergent plate margins in the …
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Geomagnetic induction and the electrical conductivity of the earth's mantle
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1961.
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Effects of lithospheric strength on convection in the Earth's mantle
Convection in Earth's mantle is driven largely by horizontal density gradients that form when cold, dense, mantle lithosphere descends into the mantle interior, either through subduction for plate-scale flow, or as localized convective instability beneath lithospheric plates. The deformation …
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Constraints on the viscosity of the Earth's mantle beneath the South Pacific
… Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Anisotropy and deformation in the Earth's mantle : seismological observations, geodynamical models, and laboratory experiments
… of elastic anisotropy and deformation in the Earth's mantle, using shear wave splitting measurements, numerical models of geodynamical processes, and laboratory experiments on mantle minerals. I evaluate the performance of several methods for measuring shear wave splitting at broadband …
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Geochemical and fluid dynamic investigations into the nature of chemical heterogeneity in the Earth's mantle
… of elements and radiogenic isotopes in mantle derived peridotites and volcanic rocks are chemical integrals over time, space, and process, which ultimately contain information about the role of convection in the earth's mantle in creating, maintaining, and destroying geochemical …
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The interaction between silicate minerals and C-O-H bearing melts in the Earth's mantle
… effect of volatile components on the melting of mantle rocks at conditions of the deep upper mantle (~180-400 km). Chemical compositions, including H2O contents, of hydrous melts, compatible with those that would form by small degree melting of an upper mantle peridotite at 180 km depth and near …
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Geochemical and fluid dynamic investigations into the nature of chemical heterogeneity in the Earth's mantle
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1992.
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Geochemistry of the earth's mantle, Nunivak Island, Alaska and other areas : evidence from xenolith studies
… Institute of Technology, Dept. of Earth and Planetary Science, 1982.
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Geochemical processes in the earth's mantle and the nature of crust-mantle interactions : evidence from studies of Nd and Sr isotope ratios in mantle-derived igneous rocks and lherzolite nodules
… Institute of Technology, Dept. of Earth and Planetary Sciences, 1980.
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Volatiles as a link between planetary interiors and the environment
… processes. Over appropriate timescales, Earth's mantle, crust, ocean, and atmosphere constitute coupled systems. The apparently synchronous Siberian Traps eruption and end-Permian mass extinction offer an ideal test case to study the interactions between magmatism and climate. In this …
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Seismic structure of the mantle beneath the Pacific Hemisphere
Aside from xenoliths, the Earth's mantle is a region that is inaccessible directly, leaving us with limited tools to investigate its characteristics indirectly. Seismology is a tool well-suited for this purpose, and has provided valuable insight regarding many fundamental processes occurring within …
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Does the theory of parameterized conveciton apply to layered mantle convection?
There are numerous models for convection of the Earth's mantle, the end cases of which are whole-mantle convection and layered convection. Heat flow is an important consideration in the evalution of these models. Simple thermal evolution models based on boundary layer theory have in the past been …
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Geochemical characerization of endmember mantle components
… define elemental abundances in reservoirs of the Earth's mantle, including EM2 (the Enriched Mantle 2), as seen in the Samoan hotspot track, and DMM (the depleted upper mantle), which is sampled at mid-ocean ridges. Together these components comprise up to [approx.] 50% of the total mantle mass. …
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Searching for life where the sun don't shine : explorations to the seafloors of Earth and Europa
Hydrothermal vents on Earth's seafloor host entire ecosystems that live off energy from chemosynthesis rather than photosynthesis. This energy process uses chemical reactions between metals and hot gases from inside Earth's mantle to fuel thriving communities of exotic organisms. Some researchers …
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