Electronic Supplementary Material 5

Electronic Supplementary Material 5

Article title: Stable isotope and mineralogical investigation of the genesis of amethyst geodes in the Los Catalanes gemological district, Uruguay, southernmost Paraná volcanic province

Journal name: Mineralium Deposita

Authors´ names: Duarte, L.C., Hartmann, L.A., Ronchi, L.H., Berner, Z., Theye, T., Massonne, H.-J.

Affiliation of the corresponding author (LAH): Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500; 91501-970 Porto Alegre, Rio Grande do Sul, Brazil

Table 5 - Variation ranges and average d18O values (‰ relative to V-SMOW) of silica minerals formed in different stages of geode filling in coladas Catalan and Cordillera; n = number of individual measurements

Colada / Catalan / Cordillera
Sequence / 1 / 2 / 3 / 1
n / range / average / n / range / average / n / range / average / n / range / average
Chalcedony / 4 / 29.5-31.5 / 30.3 / 2 / 24.1-28.6 / 26.4 / 1 / 24.0 / 24.0 / 5 / 22.6-32.1 / 26.8
Fine grained quartz / 5 / 21.2-25.2 / 24.0 / 2 / 24.5-24.9 / 24.7 / 2 / 22.2-23.6 / 22.9 / 2 / 21.9-22.3 / 22.1
Quartz / 1 / 22.2 / 22.2 / 2 / 24.3-27.2 / 25.8 / 2 / 22.5-24.9 / 23.7 / 5 / 22.2-26.8 / 25.6
Amethyst / 1 / 27.7 / 27.7 / 2 / 28.5-29.8 / 29.2 / 2 / 29.4-29.7 / 29.6 / 4 / 27.0-29.7 / 28.0