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 20 of 215 for “"Detrital"”.
-
Sources and Biochemical Composition of Detrital Organic Matter In theSea
<p>Detrital organic matter in the oceans is one of the largest and most dynamic reservoirs of reactive organic carbon on Earth. Despite the importance of this reservoir in the global cycle of carbon and associated bioreactive elements, not much is known about its sources, chemical composition and …
-
Detrital muscovite thermochronology in two drainage basins in western Bhutan
… the 40Ar/39Ar cooling age distributions of detrital minerals in the two river catchments of the Punatsang chu and the Wang chu. Muscovites from five samples of Wang chu river sands yield ages (corresponding roughly to the time of bedrock cooling through a temperature of ca.350°C) between …
-
Detrital Zircon Analysis of Permian Victoria Group Sandstones, Transantarctic Mountains, Antarctica
… data indicate that this basin had two major detrital sources, a cratonic source and a volcaniclastic source that characterizes the upper Buckley Formation and younger Triassic beds. In order to investigate the sedimentary provenance further, detrital zircons have been examined from both …
-
Effects of Light and Macroinvertebrate Consumers on Detrital Microbial Biofilms in Streams
<p>In lotic freshwater systems, aquatic macroinvertebrates are key processors of biofilms that grow upon organic matter. Although macroinvertebrate effects on biofilms may depend on light availability, the combined effects of consumers and light remain unexplored. Here, I conducted experiments to …
-
Freshwater Invertebrate Assimilation Nutrients from Detrital Biofilms Under Light and Phosphorus Manipulation
… synergistic effects of light and nutrients on detrital biofilms may explain how aquatic detritivores respond to anthropogenic change. The objective of this study was to employ C and phosphorus (P) isotopic radiolabels to understand how microbial biofilm constituents (i.e heterotroph and …
-
Effects of grazing by the oligochaete, Aeolosoma, on detrital and periphytic assemblages
The effects of grazing by the small oligochaete, Aeolosoma, on periphyton assemblages of different algal composition and on unconditioned detritus were examined. Natural water and periphyton inoculum were collected from a littoral environment and used to construct laboratory microcosms. Changes in …
-
The role of shredders in detrital dynamics of permanent and temporary streams
… study were 1) to integrate several aspects of detrital dynamics with the composition and production of shredder populations and 2) to present evidence of a shredder regulatory role in headwater strewn detrital dynamics. The importance of leaf shredding aquatic insects (shredders) in the …
-
The Global Detrital Zircon Database: Quantifying the Timing and Rate of Crustal Growth
Published detrital zircon geochronological data was compiled to form the Global Detrital Zircon Database (GDZDb). This database provides a reference block for provenance analysis by future detrital zircon geochronological studies. This project entailed three subprojects: 1. crustal growth/crustal …
-
Carbonate Replacement of Detrital Quartz in Upper Cambrian Dolomites of Warren County, New Jersey
Made available in DSpace on 2014-12-04T19:14:07Z (GMT). No. of bitstreams: 1 6104363.pdf: 2121753 bytes, checksum: 30dcd97524c58bcc1eae0969e6956f2a (MD5) Previous issue date: 1961
-
Microbial interactions associated with biofilms attached to Trichodesmium spp. and detrital particles in the ocean
… biofilms attached to Trichodesmium spp. and detrital (photosynthetically-derived sinking particulate organic carbon, POC) particles. These hot spots of microbial activity are primary sites of interaction between marine primary producers and heterotrophs and crucial components of the …
-
Microbial interactions associated with biofilms attached to Trichodesmium spp. and detrital particles in the ocean
… biofilms attached to Trichodesmium spp. and detrital (photosynthetically-derived sinking particulate organic carbon, POC) particles. These hot spots of microbial activity are primary sites of interaction between marine primary producers and heterotrophs and crucial components of the …
-
Characterizing Provenance of the Late Wisconsinan Rainy Lobe Using Fine-Fraction Geochemistry and Detrital Zircon Geochronology
… mixing models, till matrix geochemistry, and detrital zircon geochronology. The multicomponent mixing model is developed to examine sedimentological variability by incorporation of older, underlying tills (e.g. Goldstein, 1989). The mixing model shows that the Hewitt till does not lie on the …
-
INNOVATIVE AND CONVENTIONAL APPROACHES TO DETRITAL ZIRCON PROVENANCE ANALYSIS: LOOKING TO THE PAST, PRESENT, AND FUTURE
<p>Detrital provenance analysis is an important tool in our understanding paleo-fluvial drainages, erosion of landscapes, paleogeographic reconstructions, and regional geologic and tectonic histories. Here, we examine the utility of multiple provenance analysis techniques through their application …
-
DETRITAL-ZIRCON GEOCHRONOLOGIC PROVENANCE ANALYSES THAT TEST AND EXPAND THE EAST SIBERIA - WEST LAURENTIA RODINIA RECONSTRUCTION
… quantitatively test correlations, we determined detrital-zircon age spectra from samples from the Sette Daban Range of SE Siberia and the Death Valley and White-Inyo regions of SW Laurentia using SHRIMP and LAICPMS. Data indicate that several Siberian samples contain zircons correlative with …
-
DETRITAL-ZIRCON GEOCHRONOLOGIC PROVENANCE ANALYSES THAT TEST AND EXPAND THE EAST SIBERIA - WEST LAURENTIA RODINIA RECONSTRUCTION
… quantitatively test correlations, we determined detrital-zircon age spectra from samples from the Sette Daban Range of SE Siberia and the Death Valley and White-Inyo regions of SW Laurentia using SHRIMP and LAICPMS. Data indicate that several Siberian samples contain zircons correlative with …
-
Single grain detrital cosmogenic Ne-21 analysis: a new tool to study long-term landscape evolution
… from frequency distributions of single grain detrital cosmogenic nuclide concentrations through the use of a combination of cosmogenic Be-10 and Ne-21 analyses and numerical modelling. The Gaub River study catchment is a tributary of the ~15,500 square km Kuiseb, one of the major ephemeral …
-
Paleogeography of Western North America: Insights from Detrital Zircon U-Pb Geochronology and Hf Isotope Geochemistry
… geochronology and Hf isotope geochemistry of detrital zircons, as well as, geologic mapping and paleocurrent analysis. The Neoproterozoic through Pennsylvanian Yukon-Tanana terrane (YTTs) in the Coast Mountains of southeastern Alaska, the Cretaceous through Eocene strata in the San Juan basin …
-
Overstory structure and detrital dynamics of ponderosa pine forests: insights into fire behavior and its carbon consequences
… and ecological insights into (c) these forests' detrital dynamics. I used lidar data to estimate biomass structure. I successfully estimated stand height, total aboveground biomass, basal area and foliage biomass. These technologies showed potential for estimating tree density, canopy base height …
Page 1 of 11