Thesis (Ph. D.)--Ohio State University, 1981. / Includes vita. Includes bibliographical references (leaves 165-171). Available online via OhioLINK's ETD Center.

Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.

Thesis (M.S. - Geosciences)--University of Arizona, 1982. / Includes bibliographical references (leaves 82-89).

published_or_final_version / Earth Sciences / Doctoral / Doctor of Philosophy

The South Mountains are composed of two fundamentally different terranes. The western half of the range consists of Precambrian metamorphic and granitic rocks, whereas the eastern half is dominated by a composite middle Tertiary pluton. North-northwest-trending, middle Tertiary dikes have extensively intruded both terranes. A major episode of middle Proterozoic metamorphism and deformation produced a steep crystalloblastic foliation that generally strikes northeast. Middle Tertiary plutonism was accompanied by intense mylonitization that affected Precambrian and middle Tertiary rocks alike. Discrete phases of mylonitization were associated with each intrusive pulse between 28 and 25 m.y.B.P. Mylonitization generally produced a lowangle foliation and east-northeast-trending lineation. The attitude of mylonitic foliation defines a broad, east-northeast-trending anticline that controls the topographic axis of the range. Structurally low rocks in the core of the anticline are nonmylonitic, but intensity of mylonitic fabric increases progressively toward higher structural levels. Mylonitic Tertiary plutonic rocks are exposed as a gently dipping carapace overlying their less deformed equivalents. Mylonitic fabric cuts through the Precambrian terrane as a broad, west-dipping zone. Rocks above and below this mylonitic zone are lithologically identical and mostly retain their Precambrian structure. Fabrics in all rock types indicate that mylonitization resulted from extension parallel to east-northeast-trending lineation and flattening perpendicular to subhorizontal foliation. Mylonitization occurred under conditions of elevated temperature but relatively low confining pressure. Gold-bearing quartz veins occur in tension fractures that are late- to post-kinematic with respect to mylonitic deformation. Mylonitization was succeeded by more brittle deformation that produced chloritic breccia and microbreccia in the footwall of a major detachment fault that dips gently to the east. The detachment fault and underlying breccia were formed by normal faulting and brittle extension in an east-northeast direction. Rocks above and immediately below the detachment fault were antithetically rotated during faulting. Mylonitization, detachment faulting, and formation of the main east-northeast-trending anticline are all manifestations of eastnortheast-directed, middle Tertiary extension. Evidence for a possible continuum between mylonitization and detachment faulting has important implications regarding the evolution of Cordilleran metamorphic core complexes.

Typescript (photocopy). / Digitized by Kansas Correctional Industries

Thesis (Ph. D.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.

In order to understand the life cycle of a mountain range, it is crucial to identify and quantify the processes that influence the rate of denudation, sediment flux through the landscape, and the resulting changes in relief over long time scales in tectonically-inactive regions. Geologic history and the quartz-rich lithologies make the southern Appalachian Mountains an ideal location for terrestrial cosmogenic nuclide (TCN) measurements aimed at studying erosion and denudation processes in an evolving post-orogenic landscape. We used in situ-produced TCN measurements of Beryllium-10 (10Be) to determine the denudation rate in ten catchments along the southern Appalachians. The locations selected are all within the east-draining Blue Ridge escarpment in North Carolina and Georgia. In five of the ten catchments we sampled two grain sizes, gravel and sand. In the remaining five catchments we sampled one grain size, sand. Our analysis provided erosion rates of 15 to 26 mm Ky-1 for the 0.025 to 0.050 cm sand samples and 12 to 20 mm Ky-1 for 3 to 8 cm gravel samples. We analyzed these TCN measurements in the context of several basin metrics, including slope and relief, derived from a digital elevation model (DEM). Our results provide evidence that most surficial basin metrics are not good predictors of denudation rates at a global scale, but can aid in predictions at a regional level. This finding supports the dynamic equilibrium hypothesis of landscape evolution and casts doubt on the possibility to estimate basin-wide denudation rates and watershed sediment supply at a global scale from simple metrics of basin morphology.

Thesis (M.S.)--Kent State University, 2009. / Title from PDF t.p. (viewed Mar. 8, 2010). Advisor: Peter S. Dahl. Keywords: Precambrian; Black Hills; geochronology; provenance; ion-microprobe; zircon; monazite; xenotime. Includes bibliographical references (p. 120-126).

Thesis (M.S.)--Ohio University, August, 2006. / Title from PDF t.p. Includes bibliographical references.