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 84 for “"Mid-Atlantic Ridge"”.
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Heat flow over the equatorial mid-Atlantic ridge.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1969.
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Trace element distribution in sediments of the Mid-Atlantic Ridge
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1970.
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MID-ATLANTIC RIDGE (12~16oN) BATHYMETRIC ANALYSIS BY EMPIRICAL MODE DECOMPOSITION
… an analysis of bathymetry at and proximal to the Mid-Atlantic Ridge (MAR) between 12°40’~16°15’N, 44.4~45.6°W, where are large bathymetric data set exist in a region where Oceanic Core Complexes have developed. It covers an area of about 15,600 square kilometers that contains at least seven …
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Abyssal mixing from bottom boundary effects in Mid-Atlantic Ridge flank canyons
… suggest that mixing in the flank canyons of the Mid-Atlantic Ridge generated when strong mean flows interact with the many sills and constrictions within the canyons may represent a dynamically important amount of abyssal mixing. The energy pathways and mechanisms of this mixing are much less …
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Boundary layer dynamics and deep ocean mixing in Mid-Atlantic Ridge canyons
… hundreds of Grand-Canyon sized canyons that line mid-ocean ridges have particularly energetic mixing. To better understand the mechanisms by which rough topography translates into energetic currents and mixing, I studied diffusive boundary layers over varying topography using theoretical …
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Hydrography and flow in the rift valley of the Mid-Atlantic Ridge
Slow-spreading mid-ocean ridges such as the Mid-Atlantic Ridge are characterized by deep axial rift valleys which are isolated from the water on the ridge flanks. Topographic effects therefore have a significant impact on the rift-valley hydrography and dynamics but little is known about the …
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Boundary layer dynamics and deep ocean mixing in Mid-Atlantic Ridge canyons
… hundreds of Grand-Canyon sized canyons that line mid-ocean ridges have particularly energetic mixing. To better understand the mechanisms by which rough topography translates into energetic currents and mixing, I studied diffusive boundary layers over varying topography using theoretical …
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Abyssal mixing from bottom boundary effects in Mid-Atlantic Ridge flank canyons
… suggest that mixing in the flank canyons of the Mid-Atlantic Ridge generated when strong mean flows interact with the many sills and constrictions within the canyons may represent a dynamically important amount of abyssal mixing. The energy pathways and mechanisms of this mixing are much less …
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Geophysical Studies of Oceanic Core Complexes: The Mid-Atlantic Ridge, 13 - 14°N
… revealed that crustal accretion processes at mid-ocean ridges are largely dependent on the relative contribution of magmatism and tectonism to plate separation. At high levels of magmatic accretion, the ridge is associated with large amounts of surficial volcanism and the formation of closely …
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Structure and evolution of an oceanic megamullion on the Mid-Atlantic ridge at 27N̊
… and its conjugate hanging wall crust on the Mid-Atlantic Ridge near 27 0N. Two megamullion complexes, an older (Ml) and younger (M2), formed successively on the west side of the rift axis in approximately the same location within one spreading segment. Megamullion M1 formed while the …
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Variations in structure and tectonics along the Mid-Atlantic Ridge, 23⁰N and 26⁰N
… depth and width of the median valley along the Mid-Atlantic Ridge (MAR) suggests that the formation of ocean crust at slow spreading centers is not a simple two-dimensional process in which crustal accretion occurs uniformly both along the ridge axis and with time. Rather, it has been proposed …
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Structure and evolution of an oceanic megamullion on the Mid-Atlantic ridge at 27°N
… and its conjugate hanging wall crust on the Mid-Atlantic Ridge near 27°N. Two megamullion complexes, an older (Ml) and younger (M2), formed successively on the west side of the rift axis in approximately the same location within one spreading segment. Megamullion M1 formed while the spreading …
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The geochemistry, mineralogy and igneous petrology of some fracture zone basalts from the southern Mid-Atlantic Ridge
… dredged from a fracture zone transecting the Mid-Atlantic Ridge at 54°S is quantitatively evaluated in terms of fractional crystallization and crystal accumulation models. Bulk rock chemistry and petrography are used to classify the samples into four distinct groups; an evolved sparsely …
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The geochemistry of selected mid-ocean ridge basalts from the Southern mid-Atlantic ridge (40°- 55°S)
… recovered from this section of the southern Mid-Atlantic Ridge (SMAR), and significantly expanded the global suite of samples from slow-spreading ridges.
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Variations in structure and tectonics along the Mid-Atlantic Ridge, 23NÌŠ and 26NÌŠ by Laura Sau Lin Kong.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
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The origin of the assymetry in the Iceland hotspot along the Mid-Atlantic ridge from continental breakup to present-day
… hotspot has interacted asymmetrically with the Mid-Atlantic ridge since continental breakup, influencing the Reykjanes Ridge over a greater distance to the south than the Aegir and Kolbeinsey Ridges to the north. We investigate causes of this asymmetry with 3D numerical models that simulate a …
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Detailed studies of the structure, tectonics, near bottom magnetic anomalies and microearthquake seismicity of the Mid-Atlantic Ridge near 37N̊
Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Detailed studies of the structure, tectonics, near bottom magnetic anomalies and microearthquake seismicity of the Mid-Atlantic Ridge near 37°N
The Mid-Atlantic Ridge is one of the most well known and yet poorly understood spreading centers in the world. A detailed investigation of the Mid-Atlantic Ridge crest near 37°N (FAMOUS) was conducted using a deeply towed instrument package. The objective was to study the detailed structure and …
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Geochemistry and mineralogy of selected Atlantic Ocean basalts
… variations in lavas from four localities in the Atlantic Ocean are evaluated quantitatively in terms of fractional crystallisation and partial melting models. Samples studied are from the Mid-Atlantic Ridge at 36°49 'N (FAMOUS), from the Islas Orcadas fracture zone on the Southwest Indian Ocean …
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