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 “"Guiana Shield."”.
-
Biodiversity And Evolution In The Guiana Shield, South America
… extant neotropical diversity, particularly the Guiana shield. For my research, I set out to explore the processes involved in shaping the remarkable extant diversity using anuran amphibians as models. With my dissertation, I provide a comprehensive review of the evolutionary history of Guiana …
-
Geology of the Suapure River area, NW Guiana Shield, Venezuela
<p>In the Suapure River area, NW Guiana Shield (Venezuela), crops out the Cedeño Supergroup which is a Precambrian lithologic volcanic-plutonic unit that includes the Cuchivero Group (Caicara Formation rhyolitic rocks, Santa Rosalía biotite granites and San Pedro leucogranites) and the Suapure …
-
Guiana Shield diamonds, the sub-cratonic lithosphere, and kimberlite emplacement in the upper crust.
… being mined for nearly 150 years within the Guiana Shield. These gemstones are an undescribed diamond suite within an understudied portion of the Amazonian Craton. Our study confirms they are likely eroding as paleo-placers from Roraima Supergroup rocks, but may have been primarily derived …
-
Phylogeography and the evolution of correlated traits under multiple origins of aposematism in the poison frog family
… contrast, the Andes, Venezuelan Highlands, and Guiana Shield have undergone extended in situ diversification at near constant rate since the Oligocene. Poison frogs have significant variation on their physiological characteristics. I measured resting and active metabolic rates of 54 species. I …
-
The geology and geochemistry of the Omai goldfield, Guyana
… granite-greenstone terrain of the Guiana Shield. Total mining reserves are estimated at 44.8 million tonnes, grading at 1.43 glt Au. The goldfield lies along an ESE-trending, regional-scale structure referred to as the Issano-Appaparu shear zone. At Omai, the gold deposits are …
-
Patterns and processes in tropical forests: an analysis of forest structure and function from long-term permanent plots in Venezuela, Northern South America
… alluvial plains being the most dynamic, while Guiana Shield forests are showing the lowest turnover rates. A weak positive relationship between AGB and AWGP was found with Guiana Shield forests having, on average, the highest values for both variables (204.8 ± 14.3 Mg C ha-1 and 3.27 ± 0.27 Mg …