IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
artículos
Título:
Se-bearing polybasite-Tac from the Martha mine, Macizo del Deseado, Santa Cruz, Argentina
Autor/es:
MÁRQUEZ-ZAVALÍA, M.F.; BINDI, L.; MÁRQUEZ, M.; MENCHETTI, S
Revista:
MINERALOGY AND PETROLOGY
Editorial:
Springer Wien
Referencias:
Lugar: Viena, Austria; Año: 2008 vol. 94 p. 145 - 150
ISSN:
0930-0708
Resumen:
Abstract Se-bearing polybasite-Tac is associated with
galena, chalcopyrite, sphalerite, tetrahedrite, electrum and
quartz at the Martha mine, an epithermal silvergold
deposit located adjacent to the Deseado Massif, Santa Cruz
province, Argentina. Three samples, with variable chemical
composition and showing the 111 unit-cell type, were
studied by means of X-ray single crystal diffraction and
electron microprobe. The unit-cell parameters were modeled
using a multiple regression method as a function of the
Ag, Sb, and Se contents. The predicted values resulted in
excellent agreement with experimental unit-cell parameters.
We observed that high contents of selenium in polybasite
are associated with relatively low copper contents. This
finding corroborates previous studies that the copper
content of pearceitepolybasite group minerals can be very
low if selenium is present.