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- Cosmogenic nuclides (2)
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Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
The Relationship Between Magmatism And Deformation During The Acadian Orogeny: A Case Study From Eastern-Central Vermont, Samuel William Lagor
The Relationship Between Magmatism And Deformation During The Acadian Orogeny: A Case Study From Eastern-Central Vermont, Samuel William Lagor
Graduate College Dissertations and Theses
The Silurian-Devonian metasedimentary rocks of the Connecticut Valley-Gaspé trough (CVGT) were subjected to multiple deformational and metamorphic events during the Acadian orogeny in the Middle-Late Devonian. Plutons intruding the Devonian Waits River and Gile Mountain Formations have been considered post-tectonic, but microstructural studies of the intrusions and their metamorphic aureoles indicate some of these plutons intruded syntectonically. This study investigates the relationship between Acadian deformation and intrusion of the Knox Mountain pluton (KMP) of central Vermont. Structural and geochronological data were collected along a c. 15 km transect from the western limit of the CVGT, where the unconformable Richardson Memorial …
The Structural Evolution Of A Portion Of The Median Batholith And Its Host Rock In Central Fiordland, New Zealand: Examples Of Partitioned Transpression And Structural Reactivation, Hannah Jane Blatchford
The Structural Evolution Of A Portion Of The Median Batholith And Its Host Rock In Central Fiordland, New Zealand: Examples Of Partitioned Transpression And Structural Reactivation, Hannah Jane Blatchford
Graduate College Dissertations and Theses
This thesis presents the results of structural analyses and detailed field mapping from a region near Adams Burn in central Fiordland, New Zealand. The region preserves assemblages of metasedimentary and metaigneous rocks deposited, intruded, and ultimately metamorphosed and deformed during the growth of a Gondwana-margin continental arc from Cambrian-Early Cretaceous. Evidence of arc growth is preserved in the Late Devonian-Early Cretaceous Median Batholith, a belt of intrusive rock whose growth culminated with the emplacement of the Western Fiordland Orthogneiss (WFO) into the middle-lower crust of the margin. Following this magmatic flare-up, the margin experienced Late Cretaceous extensional orogenic collapse and …
High Flow Events As Hot Moments Of Reactive Fe And P Export: Impacts Of Land Cover And Seasonality, Braden Rosenberg
High Flow Events As Hot Moments Of Reactive Fe And P Export: Impacts Of Land Cover And Seasonality, Braden Rosenberg
Graduate College Dissertations and Theses
High flow events often comprise the majority of annual discharge and riverine geochemical flux of phosphorus (P) and metals such as iron (Fe) and manganese (Mn) due to glacial melt, snowmelt, and storm-driven sustained high flow. Aquatic ecosystem productivity in receiving water bodies such as Lake Champlain and the Gulf of Alaska (GoA) are impacted by the riverine import of nutrients. The magnitude of these high flow events can be a strong predictor of receiving water body conditions, and in some cases can contribute to eutrophication. We explore the intersection of high flow events and land cover in contrasting catchments …
Using Long- And Short-Lived Sediment-Associated Isotopes To Track Erosion And Sediment Movement Through Rivers In Yunnan, Sw China, Thomas Bundgaard Neilson
Using Long- And Short-Lived Sediment-Associated Isotopes To Track Erosion And Sediment Movement Through Rivers In Yunnan, Sw China, Thomas Bundgaard Neilson
Graduate College Dissertations and Theses
This research aims to understand the natural and human influences on erosion in three tributary watersheds to the Mekong River, Yunnan Province, China and to assess the utility of a novel application of isotopic indicators of erosion. It explores how erosion varies through time and space as a function of physical characteristics of the landscape, tectonic forces, and human alteration of the landscape for forestry and agriculture. To accomplish these goals, I use four sediment-associated radionuclides: in situ 10Be, meteoric 10Be, 210Pbex, and 137Cs. These isotopes accumulate in or on sediment grains, and each accumulates to a different depth on …
Preservation And Sediment Cycling Beneath "Ghost Glaciers": How Cold-Based Ice Dictates Arctic Landscape Evolution, Lee Corbett
Preservation And Sediment Cycling Beneath "Ghost Glaciers": How Cold-Based Ice Dictates Arctic Landscape Evolution, Lee Corbett
Graduate College Dissertations and Theses
Constraining past episodes of climate change and glacial response is critical for understanding future impacts of climate change, especially in the high latitudes where warming is expected to be rapid and most of Earth's glaciers exist. Many studies of past glacier size utilize rare isotopes called cosmogenic nuclides to perform surface exposure dating. Since most areas of Earth's surface that were previously glaciated were covered by erosive ice, which stripped away pre-existing cosmogenic nuclides, surface exposure dating yields the timing of the most recent deglaciation. However, in some high latitude areas where glacial ice is cold-based and non-erosive (so-called 'ghost …
Comparing Meteoric 10be, In Situ 10be, And Native 9be Across A Diverse Set Of Watersheds, Emily Sophie Greene
Comparing Meteoric 10be, In Situ 10be, And Native 9be Across A Diverse Set Of Watersheds, Emily Sophie Greene
Graduate College Dissertations and Theses
The cosmogenic nuclide 10Be is a tool for quantifying earth surface processes that occur on millennial timescales. 10Be is produced in the atmosphere (meteoric 10Be) or in mineral grains (in situ 10Be). Well-understood nuclear physics, physical mixing processes, and the denudation of regolith control concentrations of in situ 10Be; in contrast, a combination of geomorphic, pedogenic, geochemical, and biological processes influence meteoric 10Be concentrations. Some have hypothesized that meteoric 10Be can be used as a tracer of sediment movement if meteoric 10Be is normalized against the concentration of native 9Be in grain coatings. This study aims to better understand Be …