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Seismic and gravitational studies of melting in the mantle's thermal boundary layers
(Massachusetts Institute of Technology, 2007)
This thesis presents three studies which apply geophysical tools to the task of better understanding mantle melting phenomena at the upper and lower boundaries of the mantle. The first study uses seafloor bathymetry and ...
The marine biogeochemistry of molybdenum
(Massachusetts Institute of Technology, 2003)
Prevailing wisdom holds that the vertical distribution of molybdenum (Mo) in the open ocean is conservative, despite Mo's important biological role and association with Mn oxides and anoxic sediments. Mo is used in both ...
Plagioclase preferred orientation in the layered mylonites : evaluation of flow laws for the lower crust
(Massachusetts Institute of Technology, 2008)
We evaluate the applicability of plagioclase and gabbro flow laws by comparing predicted and observed deformation mechanisms in gabbroic shear zones. Gabbros and layered gabbro mylonites were collected from the Southwest ...
Basalt petrogenesis beneath slow- and ultraslow-spreading Arctic mid-ocean ridges
(Massachusetts Institute of Technology, 2009)
To explore the ability of melting mafic lithologies to produce alkaline ocean-island basalts (OIB), an experimental study was carried out measuring clinopyroxene (Cpx)melt and garnet (Gt)-melt partition coefficients during ...
Geochemical and rheological constraints on the dynamics of the oceanic upper mantle
(Massachusetts Institute of Technology, 2007)
I provide constraints on mantle convection through observations of the rheology and composition of the oceanic upper mantle. Convection cannot be directly observed, yet is a fundamental part of the plate tectonic cycle. ...
A radiocarbon method and multi-tracer approach to quantifying groundwater discharge to coastal waters
(Massachusetts Institute of Technology, 2003)
Groundwater discharge into estuaries and the coastal ocean is an important mechanism for the transport of dissolved chemical species to coastal waters. Because many dissolved species are present in groundwater in concentrations ...