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Now showing items 41-50 of 65
Kinetic processes of mantle minerals
(Massachusetts Institute of Technology, 2000)
This dissertation discusses the experimental results designed to constrain the processes of MORB generation. The main focus of this study is to investigate the location and the related processes of the transformation ...
Tropical climate variability from the last glacial maximum to the present
(Massachusetts Institute of Technology, 2005)
This thesis evaluates the nature and magnitude of tropical climate variability from the Last Glacial Maximum to the present. The temporal variability of two specific tropical climate phenomena is examined. The first is the ...
Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese
(Massachusetts Institute of Technology, 2012)
Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micro-nutrients with oceanic distributions that are influenced by both biological ...
Uranium-series radionuclide records of paleoceanographic and sedimentary changes in the Arctic Ocean
(Massachusetts Institute of Technology, 2009)
The radionuclides ²³¹Pa and ²³⁰Th, produced in the water column and removed from the ocean by particle scavenging and burial in sediments, offer a means for paleoceanographers to examine past dynamics of both water column ...
The tectonics and three-dimensional structure of spreading centers--microearthquake studies and tomographic inversions
(Massachusetts Institute of Technology, 1987)
Two-thirds of the Earth's surface has been formed along a global system of spreading centers that are presently manifested in several different structural forms, including the classic rift valley of the Mid-Atlantic Ridge, ...
Organic phosphorus in marine sediments : chemical structure, diagenetic alteration, and mechanisms of preservation
(Massachusetts Institute of Technology, 2000)
Phosphorus, an essential nutrient, is removed from the oceans only through burial with marine sediments. Organic phosphorus (Prog) constitutes an important fraction (ca. 25%) of total-P in marine sediments. However, given ...
Prediction of continental shelf sediment transport using a theoretical model of the wave-current boundary layer
(Massachusetts Institute of Technology, 1987)
This thesis presents an application of the Grant-Madsen-Glenn bottom boundary layer model (Grant and Madsen, 1979; Glenn and Grant, 1987) to predictions of sediment transport on the continental shelf. The analysis is a ...
Particle flux in the Western Black Sea in the present and over the last 5,000 years : temporal variability, sources, transport mechanisms
(Massachusetts Institute of Technology, 1987)
Fluid flow and sound generation at hydrothermal vent fields
(Massachusetts Institute of Technology, 1988)
Helium and lead isotope geochemistry of oceanic volcanic rocks from the East Pacific and South Atlantic
(Massachusetts Institute of Technology, 1987)
The isotopic evolution of helium and lead in the Earth is coupled by virtue of their common radioactive parents uranium and thorium. The isotopic signatures in oceanic volcanic rocks provide constraints on the temporal ...