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The Canadian Mineralogist; August 2009; v. 47; no. 4; p. 833-846; DOI: 10.3749/canmin.47.4.833
© 2009 Mineralogical Association of Canada
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Articles

THE TRACE-ELEMENT RECORD IN ZIRCON FROM THE LAVRAS DO SUL SHOSHONITIC ASSOCIATION, SOUTHERNMOST BRAZIL

Joaquim Daniel de Liz1,§, Lauro Valentim Stoll Nardi2, Evandro Fernandes de Lima2 and Kym Jarvis3

1 Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
2 Centro de Estudos em Petrologia e Geoquímica, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil
3 School of Earth Sciences and Geography, Kingston University, Kingston, England, U.K.

§ E-mail address: jdanielliz{at}yahoo.com.br

Zircon concentrates from samples of a granodiorite, rhyolite, quartz monzonite, monzonite, and diorite from the Lavras do Sul Shoshonitic Association (LSSA) were analyzed by LA–ICP–MS for trace elements including the REE after petrographic and mineralogical studies. These rocks are representative of a Neoproterozoic comagmatic suite associated with the postcollisional setting and strike-slip basins in southernmost Brazil. Trace-element contents in zircon grains were divided by the whole-rock contents and the calculated zircon/rock values (D) were compared with mineral/melt partition coefficients (Kd). In spite of the very large range for trace-element contents, even in the same grain, the average values are close to those expected from Kd mentioned by several authors. The REE show typical chondrite-normalized patterns, with strong enrichment of HREE and small positive Ce anomalies. The trace-element compositions of zircon from LSSA reflects the magma composition, and hence provide a useful tool to determine provenance of detrital zircon and in petrogenetic studies.

Keywords: zircon, trace elements, partition coefficient, shoshonitic association, Lavras do Sul, Brazil.






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