Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Atmospheric evolution (1)
- Fold-and fault-related fractures (1)
- Fold-and-thrust belt (1)
- Fracture analysis (1)
- GIS (1)
-
- Groundwater-surface water interactions (1)
- Hydraulic conductivity (1)
- Image enhancement techniques (1)
- Iran (1)
- Kazerun fault zone (1)
- Lineament extraction (1)
- Linear versus non-linear model (1)
- Master recession curve (1)
- Oxygen content of the atmosphere (1)
- Pb isotopes (1)
- RECESS (1)
- Rare earth elements (1)
- Regolith thickness (1)
- Regolith wells (1)
- Remote sensing (1)
- Th/U ratios (1)
- Thin- and thick-skinned tectonics (1)
- Time-integrated (1)
- U-Th decoupling (1)
- Zagros (1)
Articles 1 - 3 of 3
Full-Text Articles in Entire DC Network
Timing And Characterization Of The Change In The Redox State Of Uranium In Precambrian Surface Environments: A Proxy For The Oxidation State Of The Atmosphere, Gerald D. Pollack
Timing And Characterization Of The Change In The Redox State Of Uranium In Precambrian Surface Environments: A Proxy For The Oxidation State Of The Atmosphere, Gerald D. Pollack
Geosciences Dissertations
The redox-sensitive geochemical behavior of uranium permits the use of Th/U ratios as a geochemical proxy for the oxidation state of the atmosphere and oceans during sedimentary processes. Due to the effects of post-depositional uranium mobility on Th/U ratios during events involving oxygenated fluids, direct measurements of Th/U ratios are often misleading, but the whole rock Pb isotope composition may be used to determine a sample¡¦s apparent time-integrated Th/U ratio (ƒÛa) and the timing associated with the onset of the U-Th-Pb geochemistry. Rare earth element (REE) concentrations were determined by isotope dilution mass spectrometry to evaluate the influence of multiple …
Estimation Of Hydraulic Properties Of The Shallow Aquifer System For Selected Basins In The Blue Ridge And The Piedmont Physiographic Provinces Of The Southeastern U.S. Using Streamflow Recession And Baseflow Data, Farshad Baloochestani
Geosciences Dissertations
The objectives of this research are to measure the aquifer properties (S, T, and K) of selected watersheds delineated to the U.S. Geological Survey gauging stations using streamflow recession and baseflow data and to describe the relations among the properties of shallow aquifers and the physical properties of the basins, such as slope, regolith type and thickness, and land use type. Geographic Information System (GIS) techniques are utilized to investigate critical physiographic controls on transmissivity and storage coefficients on a regional basis. Moreover, the effect of evapotranspiration on recession index is illustrated. Finally, a detailed quantitative comparison of results for …
Kinematic And Tectonic Significance Of The Fold- And Fault- Related Fracture Systems In The Zagros Mountains, Southern Iran, Katayoun Mobasher
Kinematic And Tectonic Significance Of The Fold- And Fault- Related Fracture Systems In The Zagros Mountains, Southern Iran, Katayoun Mobasher
Geosciences Dissertations
Enhancement methods applied on various satellite images (ASTER, ETM and RADAR SAT-1) facilitated the identification and mapping of tectonic fractures in the Zagros fold-and-thrust belt in southwest Iran. The results of the fracture analysis on these enhanced images reveal four principal fracture sets within each fold structure: (i) an axial set defined by normal faults oriented parallel to the fold axial trace, (ii) a cross-axial, extensional fracture set oriented perpendicular to the fold axial trace, (iii) and two sets of intersecting shear fractures, oriented at an acute angle to the cross-axial set. Study of the enhanced images also revealed five …