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Ordonez, F Romero; Kawashita, Koji; Schultz-Guttler, R
3. South American symposium on isotope geology. Extended abstracts2001
3. South American symposium on isotope geology. Extended abstracts2001
AbstractAbstract
[en] The age of emeralds is related to the environment within which they form and can be dated by geochronological methods of which the rubidium-strontium (Rb-Sr) method (Faure, 1986) is the best to date the emeralds and its host rocks (Vidal et al., 1992). Isotopic studies done by Vidal et al. (1992) established two different geochronological environments for dating emeralds depending on their ages: emeralds from Precambrian rocks in Brazil, Madagascar and Zambia with high radiogenic strontium enrichment due to the older ages and high Rb contents and emeralds hosted by younger rocks in Colombia, Paquistan and Afganistan generally, with low 87Rb/86Sr range and low radiogenic Sr enrichment, and low content of Rb (au)
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Servicio Nacional de Geologia y Mineria, Santiago (Chile); 642 p; Oct 2001; p. 511-514; 3. South American symposium on isotope geology; Pucon (Chile); 21-24 Oct 2001; Available from Library of CCHEN
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Conference
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