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 5 of 5 for “"Organic-rich sediment"”.
-
Quantity and isotopic composition of reduced sulfur in Cretaceous organic-rich shales
Over 200 samples of mid-Cretaceous organic-rich sediment were examined to determine abundance and isotopic composition of reduced sulfur. Mid-Cretaceous pelagic sediments, particularly those of the North and South Atlantic, are characterized by high organic carbon contents relative to the modern …
-
Foraminiferal and stable isotope investigation of the Cenomanian-Turonian extinction and oceanic anoxic event
… is the oceanic anoxic event (OAE 2) and the organic-rich black shales deposited during this interval. Associated with these organic-rich sediments is a positive carbon isotope anomaly. This excursion has a distinct profile and has hence been used for global correlation. There was also a …
-
Nitrogen isotopes in chlorophyll and the origin of Eastern Mediterranean sapropels
… carbon isotope ratios in marine particulate and sedimentary chlorophyll derivatives; (2) to establish chlorophyll δ15N and δl3C as proxies for the nitrogen and carbon isotopic composition of marine phytoplankton; and (3) to use chlorophyll nitrogen isotopic ratios to understand the origin of Late …
-
Modeling temporal and spatial variations in dissolved oxygen in Amite River
… spatial variations in DO in lowland rivers with organic-rich fine-grained sediment. The modeling framework is based on three major contributions/new models, including (1)VART-DO model for improved estimation of reaeration coefficient (K2) in natural streams, (2)VART-DOS model for simulation of …
-
Heavy metal contamination in the Black River, Cape Town
Urban river sediments are often contaminated as a result of development and anthropocentric activity, and the Black River in Cape Town is a prime example of a river system suffering from unsustainable development. Methods of deter mining total and background concentrations of selected heavy metals …