The overall purpose of the project was to explore and quantify the processes that control the formation and reactivity of biogenic iron microminerals and their impact on the solubility of metal contaminants. The research addressed how surface components of bacterial cells, extracellular organic material, and the aqueous geochemistry of the DIRB microenvironment impacts the mineralogy, chemical ...

A. T. Basilevsky, L. Li. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, 210023, China ([email protected]), Dept. Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912 USA, Vernadsky Institute of Geochemistry and Analytical Chemistry Russian Academy of Sciences, Moscow, Russia. Department of Earth Sciences, Indiana University-Purdue Univer...

CHEMICAL EQUILIBRIUM CONSTRAINTS. A. C. McAdam, M. Yu. Zolotov, M. V. Mironenko, and T. G. Sharp, Atmospheric Experiments Laboratory, Code 699, Goddard Space Flight Center, Greenbelt, MD 20771, [email protected], School of Earth & Space Exploration, Arizona State University, Tempe, AZ 852871404, [email protected], Vernadsky Institute of Geochemistry & Analytical Chemistry, Russian Acade...

THERMAL IONIZATION MASS SPECTROMETRY STUDIES OF SM AND GD ISOTOPIC SHIFTS IN LUNAR METEORITES DUE TO NEUTRON CAPTURE: A PROGRESS REPORT. K. C. Welten, T. L. Owens, D. J. DePaolo, Space Sciences Laboratory, University of California, Berkeley, CA 94720-7450 (e-mail: [email protected]); Center for Isotope Geochemistry, Department of Earth and Planetary Science, UC Berkeley & Lawrence Berkeley ...

UNEQULIBRATED ORDINARY CHONDRITES: THERMODYNAMIC MODELING FOR THE SEMARKONA COMPOSITION. M. Yu. Zolotov, M. V. Mironenko, and E. L. Shock, Department of Geological Sciences, Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, Vernadsky Institute of Geochemistry and Analytical Chem., Russian Academy of Sciences, Kosygin Str. 19, Moscow, Russia. E-mails: esho...

In this note we introduce a method for robust principal component regression. Robust principal components are computed from the predictor variables, and they are used afterwards for estimating a response variable by performing robust linear multiple regression. The performance of the method is evaluated at a test data set from geochemistry. Then it is used for the prediction of censored values ...

Clumped isotope geochemistry is concerned with the state of ordering of rare isotopes in natural materials. That is, it examines the extent to which rare isotopes (D, C, N, O, etc.) bond with or near each other rather than with the sea of light isotopes in which they swim. Abundances of isotopic ‘clumps’ in natural materials are influenced by a wide variety of factors. In most cases, their conc...