Geochemistry of the kaolinized zone of Estrella Gaucha mine, Province of Chubut

Main Article Content

Pedro J Maiza
Silvina A Marfil
Esteve Cardellach
Juan Zunino

Abstract

Estrella Gaucha mine is situated 70 km of Alto Río Senguerr (Province of Chubut). It is a kaolin deposit hosted by sandy and conglomeratic tuffs of the Apeleg Formation (Lower Cretaceous). The mineralogy of the zone is very homogeneo usand it is characterized by dickite almost pure, traces of alunite and quartz. There are four alteration zones. 1) silicification; 2) zone with alunite; 3) kaolinizedzone and 4) zone with sericite - chlorite. In order to know the origin of the deposit a mineralogical, geochemical (major and trace elements) and stable isotope study (O and H) of the kaolinized zone was carried out. Trace element content and ratios of kaolin samples (P vs. S, Zr vs. Ti, Cr + Nbvs. Ti + Fe, and Ce + Y + La vs. Ba + Sr) suggest they are formed from hydrothermal alteration of the enclosing rocks. δ18O values of kaolin range from +5.1 to +8.8 ‰ and D varies from -82 to -89‰.These values are compatible with fluids of hydrothermal origin.

Article Details

How to Cite
Maiza, P. J., Marfil, S. A., Cardellach, E., & Zunino, J. (2021). Geochemistry of the kaolinized zone of Estrella Gaucha mine, Province of Chubut. Revista De La Asociación Geológica Argentina, 64(3), 426-432. Retrieved from https://revista.geologica.org.ar/raga/article/view/1225
Section
Articles