Now showing items 1-9 of 9
SILICA PRESERVATION IN THE OCEANS
This study was undertaken to explain why silica is preserved in the oceans, which are undersaturated in silica. Ion probe, electron probe and SEM analysis of the surface chemistry of radiolarians (a siliceous microfossil) ...
MODELS TO OPTIMIZE THE EVALUATION AND EXTRACTION OF URANIUM FROM SEDIMENTARY ORE DEPOSITS WITH APPLICATIONS TO IN-SITU LEACHING
With increasing demands for nuclear power supplies, more efficient means of evaluation and extraction of sedimentary uranium ore deposits, which form 96% of the U.S. reserves, are required. The fluvial, deltaic, and ...
SOME PROBLEMS CONCERNING THE MIGRATION AND DISTRIBUTION OF HELIUM-4 AND RADON-222 IN THE UPPER SEDIMENTS OF THE CRUST - A THEORETICAL MODEL; AND THE DEVELOPMENT OF A QUADRUPOLE ION FILTER FOR MEASURING HELIUM AT THE SOIL-AIR INTERFACE
The generation, distribution, and migration process of helium-4 and radon-222 in the upper lithosphere and their fluxes at the soil-air interface were extensively reviewed. Global baseline concentration values were obtained ...
The origin and evolution of lavas from Haleakala Crater, Hawaii
Sr, Nd, and Pb isotope systematics of lavas from the Maui Volcanic Complex (MVC) are consistent with a three-component petrogenetic mixing model. MVC shield-building (SB) lavas define linear trends on isotope-isotope plots, ...
ORIGIN, DISTRIBUTION AND ALTERATION OF ORGANIC MATTER AND GENERATION AND MIGRATION OF HYDROCARBONS IN AUSTIN CHALK, UPPER CRETACEOUS, SOUTHEASTERN TEXAS
The Austin Chalk is an impure "onshore" chalk that was deposited on a ramp marginal to the Gulf of Mexico during the Late Cretaceous. Basinal chalks are organic rich, commonly containing 0.5-5.0% amorphous, sapropelic ...
A STUDY OF THE CARBON CYCLE