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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.
11

The evolution and modification of continental lithosphere, dynamics of 'indentor corners' and imaging the lithosphere across the eastern syntaxis of Tibet.

Zurek, Brian. January 2008 (has links)
Thesis (Ph.D.)--Lehigh University, 2008. / Adviser: Anne Meltzer.
12

Evolution and subsidence mechanisms of the northern Cordilleran foreland basin during the middle Cretaceous /

Yang, Yongtai. January 2008 (has links)
Thesis (Ph. D.)--University of Toronto, 2008. / Includes bibliographical references.
13

A new technique for measuring the magnetic fabric of hematite-bearing sedimentary rocks, hf-AIR: Inclination correction case studies of carboniferous red beds from the Maritime provinces of Canada.

Bilardello, Dario. January 2008 (has links)
Thesis (Ph.D.)--Lehigh University, 2008. / Adviser: Kenneth P. Kodama.
14

Nature and dynamics of earth and planetary cores from high-pressure properties of iron-rich alloys /

Chen, Bin, January 2009 (has links)
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2009. / Source: Dissertation Abstracts International, Volume: 70-06, Section: B, page: 3383. Adviser: Jie Li. Includes bibliographical references (leaves 94-108) Available on microfilm from Pro Quest Information and Learning.
15

Geophysical studies in the Filchner Ice Shelf area of Antarctica

Behrendt, John C., January 1961 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1961. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 120-125).
16

Outlet glacier dynamics in East Greenland and East Antarctica.

Stearns, Leigh Asher. Unknown Date (has links)
Thesis (Ph.D.)--The University of Maine, 2007. / (UMI)AAI3295282. Source: Dissertation Abstracts International, Volume: 68-12, Section: B, page: 7884. Adviser: Gordon S. Hamilton.
17

Seismic studies of the East African Rift System and the Tibetan Plateau : implications for the rheology of lithosphere and the evolution of rifts in continents /

Yang, Zhaohui, January 2009 (has links)
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2009. / Source: Dissertation Abstracts International, Volume: 70-06, Section: B, page: 3389. Adviser: Wang-Ping Chen. Includes bibliographical references. Available on microfilm from Pro Quest Information and Learning.
18

Rifting and Inversion along the Palos Verdes Fault Zone, San Pedro Shelf, Offshore Southern California

Shimer, Peter A. 13 July 2018 (has links)
<p> This study examines the relationship of the Palos Verdes Fault Zone (PVFZ), an important fault zone in the Inner Borderland (IB), to the Palos Verdes Anticlinorium, Wilmington Graben, and other structures through detailed mapping of the fault zone constructed from high resolution 2D and 3D seismic reflection data and well logs. The data reveal a Mohnian-Delmontian trough, controlled by rifting and predating Palos Verdes Anticlinorium uplift, along the western PVFZ boundary. Sediment growth in the trough, the bulk of which occurred during the Mohnian, locally persisted into the Repettian. The western PVFZ boundary fault then transitioned to a transpressional regime beginning during the Repettian, inverting trough sediments. Typical of transpressional restraining bends along strike-slip faulting, varying degrees of inversion occur along the fault, with moderate inversion occurring on the central shelf with areas of little to no inversion to the north and south, all bounded by extreme inversion in the Palos Verdes Peninsula to the north and Lasuen Knoll to the south. </p><p> The present location and geometry of the PVFZ with its various restraining and releasing bends, is potentially a product of the early rifting episode, which is related to other sub-parallel major IB rifts, such as San Pedro Basin, San Diego Trough, and Los Angeles Basin. At roughly 65 km long, 1-7 km wide, and 1-1.5 km deep, the PVFZ trough is much narrower than the other IB basins, except the San Diego Trough.</p><p>
19

Analog Modeling of Anisotropy of Magnetic Susceptibility as Affected by Pure Shear Strain on Original Magnetic Fabrics of Sedimentary Rocks

Seaux, Gage E. 03 May 2018 (has links)
<p> Analysis of the anisotropy of magnetic susceptibility (AMS) is an easy, non-destructive method to determine the preferred orientations of minerals in rocks and rock analogs. The orientations of the principal susceptibility axes (K<sub>max</sub>&ge;K<sub>int</sub>&ge;K<sub>min</sub>) of the AMS ellipsoid are generally parallel to the principal axes of the strain ellipsoid (X&ge;Y&ge;Z). The orientations of the AMS axes as well as the magnitudes change in response to strain, though a generally accepted correlation between the magnitudes of the principal axes of AMS and strain has not yet been established. A successful correlation of the magnitudes of the principal susceptibility axes of AMS and strain would allow an easy and non-destructive method of quantitative strain analysis. This would also allow quantitative strain analyses of rocks where traditional methods using strain markers fail. In this study, the quantitative aspect of the relationship between strain and AMS is investigated experimentally using artificial mineral mixtures with a sedimentary initial magnetic fabric in an attempt to correlate strain to AMS. Mineral mixtures of magnetite, biotite, and specular hematite with a matrix of Art Time Dough<sup>&reg;</sup> (similar to Playdoh<sup>&reg;</sup>) were mixed separately. To create a random magnetic fabric, the samples were kneaded by hand for approximately 15 minutes. The samples were then strained to 70% strain in one direction to create a sedimentary initial magnetic fabric. The orientation of this strain became the Z axis of the strain ellipsoid. The samples were then strained perpendicular to this axis incrementally from 0% to 40% strain in 5% increments, with the AMS measured at each interval. The orientation of this strain became the Y axis of the strain ellipsoid. The data from these experiments resulted in the quantitative correlation of strain and AMS for the magnetite mineral mixtures. The biotite and specular hematite mixtures contain enough magnetite inclusions and magnetite conversion respectively to dominate the AMS. This creates a more complex relationship that is not easily correlated quantitatively to strain. The experiments demonstrate that a strong qualitative relationship exists between both the orientations and the magnitudes of the axes of the strain and AMS ellipsoids.</p><p>
20

Geophysical Analysis of the Miocene-Pliocene Mangaa Formation for Better Exploration within the Parihaka 3D Survey; Taranaki Basin, New Zealand

Bujard, Jade P. 13 September 2017 (has links)
<p> The Taranaki Basin is the only known producing basin within New Zealand. Since the drilling of the first well in 1865, the Taranaki basin has remained relatively underexplored. The Arawa-1 well was drilled in 1992 using 2D seismic lines as a control. New Zealand has started an exploration initiative by publicly releasing all geological and geophysical information gathered on and offshore New Zealand. The gathered information includes the Parihaka 3D survey, which directly overlaps with the Arawa-1 well and original 2D lines. This study focused on the Miocene-Pliocene Mangaa Formation, which exhibited reservoir quality within the Arawa-1 well. Seismic attributes have been used to locate an area of interest within the Mangaa Formation. A Coherence attribute was useful for identifying geomorphological features as well as faults. An average energy volume was used to emphasize brighter amplitudes from background signatures and to define lateral boundaries of the reservoir. Upon mapping an area of interest within the Mangaa Formation, the amplitude anomalies were conformable to structural highs. Results were compared to an analog well, Karewa-1, where amplitude anomalies were relatively identical. Amplitude versus offset analysis was conducted for the amplitude anomaly within the Mangaa Formation and found a class 4 anomaly. The interpreter performed fluid replacement modeling with the assumption of 100% gas, derived from the analog, Karewa-1. The interpreter compared the resulting model to the observed trends inside and outside of the amplitude anomaly. The gas model signature resembled that of the amplitudes inside of the amplitude anomaly, and the amplitude signature of the original water saturation resembled that of the amplitudes outside of the anomaly. The results allow the interpreter to use the correlation of amplitude signatures and fluids in place to assist in de-risking prospect potential. </p><p>

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