Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 6 of 6 for “"Oxidative weathering"”.
-
Inferences on the Influences of Age & Porosity on Oxidative Weathering of Massive Sulfides at the Endeavour Segment of Juan de Fuca Ridge
… These processes are collectively described as oxidative weathering. While the observed textures of these deposits suggest significant variation in weathering rates, neither the causes of this variation nor the drivers that govern biogeochemical oxidation of massive sulfides are …
-
Inferences on the influences of age & porosity on oxidative weathering of seafloor massive sulfide deposits at the endeavour segment of the Juan de Fuca Ridge
… These processes are collectively described as oxidative weathering. While the observed textures of these deposits suggest significant variation in weathering rates, neither the causes of this variation nor the drivers that govern biogeochemical oxidation of massive sulfides are …
-
Isotopes of selenium as redox tracers of geochemical processes influencing the export and behavior of selenium contamination in coal mine watersheds
… drinking water. Se contamination is released by oxidative weathering of Se-bearing shales, and this contamination is often associated with mining activity. Selenium is most mobile and toxic in its oxidized Se(VI) form, less mobile as Se(IV), and immobile in the Se(0) or Se(-II) forms. Se isotope …
-
Early evolution of environments and metabolism: insights from nitrogen, selenium and sulfur isotopes
… technique, I show that selenium was mobilized by oxidative weathering in the late Archean, concurrently with sulfur. Because of selenium's high redox potential, these results confirm the antiquity of oxygenic photosynthesis. A compilation of selenium data through time further indicates oxygenation …
-
The Carbon Budget of the Mekong River Basin: A Spatial and Temporal Study of Chemical Weathering
The chemical weathering of silicate rocks with carbonic acid is thought to play an important role in the consumption of atmospheric carbon dioxide (CO$_{2}$), which regulates global climate over million--year timescales. However, the climatic implications of chemical weathering of carbonate rocks …
-
Sedimentology and diagenesis of Ediacaran phosphorites from South China
… mineral, phosphosiderite. As a product of oxidative weathering and/or thermal stabilization of ferrous iron-phosphates (e.g., vivianite), this cement is suggestive of precipitation from ferruginous porewaters. This is the first direct evidence for iron-phosphate minerals in Ediacaran …