Gleb S. Pokrovski, J. Roux, Jean‐Louis Hazemann, Anastassia Y. Borisova, Anastasia Gonchar, Mikhail Lemeshko,
Abstract Despite the growing geological evidence that fluid boiling and vapour-liquid separation affect the distribution of metals in magmatic-hydrothermal systems significantly, there are few experimental data on the chemical status and partitioning of metals in the vapour and liquid phases. Here we report on an in situ measurement, using X-ray absorption fine structure (XAFS) spectroscopy, of antimony speciation and partitioning in the system Sb 2 O 3 -H 2 O-NaCl-HCl at 400°C and pressures 270—300 ...
Tópico(s): Geochemistry and Geologic Mapping
2008 - Cambridge University Press | Mineralogical Magazine
Gleb S. Pokrovski, Jacques Roux, Jean‐Louis Hazemann, Anastassia Y. Borisova, Anastasia Gonchar, Mikhail Lemeshko,
Abstract This paper highlights new research on the biomineralization of otoliths and uses a mineralogical approach to understand mechanisms of crystal growth and metal incorporation into otoliths. Petrographic observations of the nucleation of otolith growth in the core for several fish species reveals that sagittal otoliths appear to nucleate around a few or many nucleation sites (primordia) and that these sites vary in size (ranging in diameter from 1 to 20 μm), depending on the species. Spectroscopic ...
Tópico(s): Fish Biology and Ecology Studies
2008 - Cambridge University Press | Mineralogical Magazine