Recent geochemical data from Oman, Newfoundland, and the western United States suggest that long-term oxidation of Ediacaran oceans resulted in progressive depletion of a large dissolved organic carbon (DOC) reservoir and potentially triggered the radiation of acanthomorphic acritarchs, algae, macroscopic Ediacara organisms, and, subsequently, motile bilaterian animals. However, the hypothesize...

Two robust approaches to principal component analysis and factor analysis are presented. The different methods are compared, and properties are discussed. As an application we use a large geochemical data set which was analyzed in detail by univariate (geo-)statistical methods. We explain the advantages of applying robust multivariate methods.

All existing ”positive” results on two neutrino double beta decay in different nuclei were analyzed. Using procedure recommended by Particle Data Group weighted average values for half-lives of Ca, Ge, Se, Zr, Mo, Mo Ru (0+1 ), Cd, Nd and U were obtained. Existing geochemical data were analyzed and recommended values for half-lives of Te and Te are proposed. We recommend to use these results as...

Changes to the Environmental Protection Act in 2012 mean that Local Authorities (LAs) have to set natural background contamination (NBC) levels for their areas. This project collected all Phase II site investigation data held by the councils and used the geochemical data to calculate the NBCs. These values were checked against samples collected in the regions to assess their accuracy. These res...

Determination of the pre-mining geochemical baseline in bed sediments and the paleoecology in a watershed impacted by historical mining activity is of utmost importance in establishing watershed restoration goals. We have approached this problem in the Animas River watershed using geomorphologic mapping methods to identify old pre-mining sediments. A systematic evaluation of possible sites resu...