SciELO - Scientific Electronic Library Online

 
vol.25 número1Una nueva especie de Steinmanella Crickmay (Bivalvia-Trigonioida) del Cretácico Inferior de la Cuenca Neuquina, ArgentinaLas Pteridophyta y el paleoambiente de la parte media de la Formación La Ternera (Triásico Superior), en Quebrada La Cachivarita, III Región, Chile índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Revista geológica de Chile

versão impressa ISSN 0716-0208

Resumo

ECHAVARRIA, Leandro E  e  ETCHEVERRY, Ricardo O. Características geoquímicas de la mineralización epitermal del área El Dorado-Monserrat, Provincia de Santa Cruz, Argentina. Rev. geol. Chile [online]. 1998, vol.25, n.1, pp.69-83. ISSN 0716-0208.  http://dx.doi.org/10.4067/S0716-02081998000100006.

ABSTRACT Geochemistry of El Dorado-Monserrat epithermal prospect, Santa Cruz, Argentina. This paper is devoted to the geochemistry of lodes and host rocks from the El Dorado-Monserrat epithermal Au-Ag deposits. The distribution haloes of the studied metals show great variations as demonstrated by the coss-cut sections through the host rocks. An increase of contents was found in close relationship with the presence of narrow veinlets carrying ore minerals. The highest Au-Ag contents were found in the Monserrat area where quartz as well as barite veins were analyzed. The results allow to establish that the former ones are Au-enriched while the barite lodes have higher Ag grades. Most of the elements show a log normal distribution with long queues towards the highest values. Many samples with different quartz textures have also been studied, those with replacement and massive textures have higher Au-Ag contents that those with banded textures. The latter is possible due to the lower formation temperatures of the banded quartz. The geochemical and textural differences found between both areas suggest that they represent different exposition levels. Monserrat, where there are coarse-grained quartz textures and carbonate replacements intergrown with pyrite and adularia, is the deepest one, and it coincides with the precipitation level of the noble elements; El Dorado represents superficial levels, with massive chalcedony and recrystallization textures, with higher contents of Hg and lack of Au-Ag.

Palavras-chave : Geochemistry; Epithermal deposit.

        · resumo em Espanhol     · texto em Espanhol

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons