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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

The evolution of the Indian Ocean triple junction and the finite rotation problem

Tapscott, Christopher Robert January 1979 (has links)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1979. / Microfiche copy available in Archives and Science. / Vita. / Includes bibliographies. / by Christopher Robert Tapscott. / Ph.D.
42

The origin of the ninetyeast ridge and the northward motion of India, based on DSDP paleolatitudes.

Peirce, John Wentworth January 1977 (has links)
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences. / Microfiche copy available in Archives and Science. / Vita. / Bibliography : leaves 223-233. / Ph.D.
43

Processing of shipborne magnetometer data and revision of the timing and geometry of the Mesozoic break-up of Gondwana = Auswertung schiffsfester Magnetometerdaten und die Neubestimmung des Zeitpunktes und der Geometrie des Mesozoischen Aufbruchs von Gondwana /

König, Matthias. January 2006 (has links)
Thesis (doctoral)--Universität Bremen, 2005. / Includes bibliographical references (p. 113-125).
44

Geochemical Modeling of Primary MORB Magmas: Implications for Parental Melting Regimes in Melt Lenses Along-Axis of the Hess Deep Rift

Drumm, Stephanie Michelle 23 March 2018 (has links)
The Hess Deep Rift in the East Pacific Rise is a mid-ocean ridge spreading center that produces melts which exhibit geochemical characteristics of evolved MORB. Using basaltic glass samples collected from multiple dive cruises that explored Hess Deep geology, volatile and chemical data were collected at USF using FTIR and EMPA, respectively. In addition, a data suite of samples of glass from Hess Deep were compiled from the EarthChem database. The intention was to use the data suite and models to compare the Hess Deep regime to analog models for mid-ocean ridge crystallization regimes and tectonic structures. The USF and EarthChem samples were then compared to various crystallization models generated in Petrolog3 (Danyushevsky and Plechov, 2011) and COMAGMAT (Ariskin and Barmina, 2004). The starting compositions using depleted, normal, and enriched MORB (Gale et al, 2013) were modeled at depths reflecting an upper and lower melt lens along the rift axis. The volatile components of the USF samples were compared to models for water and carbon dioxide behavior in basalt made using VolatileCalc (Newman and Lowenstern, 2002). Based on the comparison of the samples to the forward modeling in Petrolog3, it appears that the geochemical behavior of major and trace elements most closely resembles that of small amounts of fractional crystallization and re-assimilation of accessory minerals. The VolatileCalc models suggest that the USF samples most likely followed a degassing pathway at depths corresponding to the shallow melt lens. When considering the analog models for ophiolite sequences and melt flow beneath a fast-spreading ridge, it appears that the melt regime at Hess Deep deviates from both standing theories. Instead the most likely mechanisms are shallow crystallization, at depths equal to or less than an upper melt lens, and shallow dynamic degassing.
45

Mass transport processes and deposits in offshore Trinidad and Venezuela, and their role in continental margin development

Moscardelli, Lorena Gina 28 August 2008 (has links)
Not available / text
46

Mass transport processes and deposits in offshore Trinidad and Venezuela, and their role in continental margin development

Moscardelli, Lorena Gina, 1977- 22 August 2011 (has links)
Not available / text
47

Earthquake source parameters, seismicity, and tectonics of the oceanographer transform fault

Muller, James Louis January 1982 (has links)
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1982. / Microfiche copy available in Archives and Science / Bibliography: leaves 79-82. / by James Louis Muller. / M.S.

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