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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Proterozoic Tectonometamorphic Evolution Of The Ruby Range, Sw Montana, Usa: Insights From Phase Equilibria Modeling And In Situ Monazite Petrochronology, Martin Cramer
Graduate Student Theses, Dissertations, & Professional Papers
Phase equilibria modeling and monazite petrochronology reveal a complex history for the Ruby Range, SW Montana, which provides insights into the reactivation and growth of the northwestern Wyoming craton. Metapelites and orthoamphibolites from three areas were investigated. Stone Creek, the structurally highest area along the western flank, records a clockwise P–T path with peak conditions of ~6.5 kbar and ~760 °C and post-peak conditions of ~6.0 kbar and ~680 °C. Monazite growth in this area occurred at 1790–1723 Ma, with monazite inclusions in garnet at 1757 ± 8 Ma. Structurally deeper rocks at Elk Gulch in the south-central part …
The Effect Of Spatial Patterns Of Soil Hydraulic Conductivity And Depth On Local And Hillslope Scale Shallow Water Table Dynamics, Casey E. Ryan
The Effect Of Spatial Patterns Of Soil Hydraulic Conductivity And Depth On Local And Hillslope Scale Shallow Water Table Dynamics, Casey E. Ryan
Graduate Student Theses, Dissertations, & Professional Papers
Much research in forested headwater catchments has focused on the role of topography for organizing subsurface flow and the hydrologic connectivity of upland flow paths to stream networks. However, little work has been conducted to evaluate how localized and hillslope scale patterns of hydraulic conductivity and soil depth contribute to spatial patterns of water table duration, magnitude, and connectivity. I monitored shallow groundwater dynamics in wells distributed across a 1st order hillslope in the Lubrecht Experimental Forest, Montana. Additionally, I collected in-situ measurements of soil saturated hydraulic conductivity and soil depth at 10m intervals across the study hillslope and compared …
Temporal Evolution Of Basal Water Pressure And Ice Velocity Along A 50 Km Flow Line Transect Of Western Greenland, Patrick Wright
Temporal Evolution Of Basal Water Pressure And Ice Velocity Along A 50 Km Flow Line Transect Of Western Greenland, Patrick Wright
Graduate Student Theses, Dissertations, & Professional Papers
The gradient in hydraulic potential at the ice-bedrock interface beneath the Greenland Ice Sheet (GrIS) dictates the routing and energetics of subglacial water, thereby influencing drainage system characteristics and sliding dynamics. In the ablation zone of the GrIS, a high relief bed and gradients in water pressure in an active subglacial drainage system potentially play a complex role in dictating the hydraulic potential field. Here we present a suite of water pressure measurements collected within thirteen boreholes along a 46 km transect on the western GrIS in order to investigate the sensitivity of the potential gradient field to seasonal evolution …
Facies, Architecture, And Sequence Stratigraphy Of The Devonian-Mississippian Sappington Formation, Bridger Range, Montana, Anna S. Phelps
Facies, Architecture, And Sequence Stratigraphy Of The Devonian-Mississippian Sappington Formation, Bridger Range, Montana, Anna S. Phelps
Graduate Student Theses, Dissertations, & Professional Papers
The Late Devonian-Early Mississippian Sappington Formation in Montana is a marine unit comprised of lower and upper organic-rich shale members and a middle calcareous siltstone member. The Sappington Formation was deposited during a period of complex paleogeography in Montana, characterized by deposition in sub-basins and onlap onto structural highs, and eustatically- and tectonically-driven transgressive-regressive cycles. Detailed outcrop analysis was conducted on the Sappington Formation across the Bridger Range in southwestern Montana to better understand the Sappington Formation depositional system and changing regional paleogeography. The Sappington Formation is further interpreted in a stratigraphic architectural framework to improve the ability to predict …
Sediment Routing Through Channel Confluences: Particle Tracing In A Gravel-Bed River Headwaters, Kurt Imhoff
Sediment Routing Through Channel Confluences: Particle Tracing In A Gravel-Bed River Headwaters, Kurt Imhoff
Graduate Student Theses, Dissertations, & Professional Papers
Sediment routing in gravel-bed rivers refers to the intermittent transport and storage of bedload particles, where short-duration steps are separated by periods of inactivity. Channel morphology governs sediment routing, but morphologic effects on routing in headwater systems are not well understood compared to lowland systems. RFID tracers are a valuable tool that can be employed to characterize routing processes in headwater channels through individual particle tracking. I present research on coarse sediment transport and dispersion through confluences using sediment tracers in the East Fork Bitterroot River basin, MT. I investigate the following questions: (1) How do sediment routing patterns through …