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A micro-analytical approach to partition coefficients in plagioclase and clinopyroxene of basaltic sills in Serra Geral Formation, Paraná Basin, Brazil

Uma abordagem microanalítica dos coeficientes de partição em plagioclásio e clinopiroxênio de soleiras basálticas da Formação Serra Geral, Bacia do Paraná, Brasil

Abstract:

In the present study, detailed micro-analytical data (major and trace elements) in minerals from sills of Serra Geral Formation represents the first attempt to evaluate the partition coefficient of Sc, Ti, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Mo, Cs, Ba, REE, Hf, Ta, Pb, Th and U among coexisting plagioclase, augite and pigeonite from 12 tholeiitic basaltic sills along the eastern border of the Paraná Basin, Brazil. These 12 samples come from Rio Grande do Sul, Paraná, São Paulo and Goiás states. Plagioclase/melt partition coefficients KD were determined in core, intermediate and rim zones using LA-ICP-MS and the results were compared with the variations of the elements Ca, Al, Na and Si in those areas. Partition coefficients of Sr and Eu decrease with the increase of Ca concentration in plagioclase. A reduction in temperature and consequently a rise in Na and Si levels increase the partition coefficients of Sr and Eu at the rim of mineral The KD of Ni and V in clinopyroxene has positive correlations with Mg2+, Ca2+ and Al3+ due to higher concentrations of those elements at the core and lower concentration towards the rim and negative correlations of KD of Sc, Cr, Co, Pb and Lu, due to preferential substitutions by Fe2+ in sixfold coordination. The use of LA-ICP-MS and EPMA made possible the chemical quantification of major and trace elements and the determination of partition coefficients in coexisting plagioclase and clinopyroxene in basaltic melts.

Keywords:
Partition coefficient; plagioclase; clinopyroxene; Serra Geral Formation; LA-ICP-MS

Resumo:

No presente estudo, dados detalhados de microanálise (elementos maiores e traços) em minerais de sills da Formação Serra Geral representam a primeira tentativa de avaliar o coeficiente de partição de Sc, Ti, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Mo, Cs, Ba, REE, Hf, Ta, Pb, Th e U entre plagioclásio, augita e pigeonita coexistentes em 12 sills basálticos toleíticos ao longo da borda leste da Bacia do Paraná, Brasil. Estas 12 amostras são dos estados do Rio Grande do Sul, Paraná, São Paulo e Goiás. Coeficientes de partição em plagioclásio foram comparados em zonas de núcleo, intermédio e borda, usando LA-ICP-MS, e os resultados foram comparados com as variações das áreas de distribuição dos elementos Ca, Al, Na e Si. O coeficiente de partição do Sr e Eu diminui com o aumento da concentração de Ca no plagioclásio e aumenta para a borda, relacionado com o aumento da concentração de Na e Si e diminuição da temperatura. O KD do Ni e V nos clinopiroxênios analisados possui correlações positivas para Mg2+, Ca2+ e Al3+ devido a altas concentrações destes elementos no núcleo, diminuindo para a borda, e correlações negativas de KD Sc, Cr, Co, Pb e Lu, devido a substituição preferencial pelo Fe2+ em coordenações octaédricas. O uso de LA-ICP-MS e EPMA possibilitam a caracterização química de elementos maiores e traços e a determinação do coeficiente de partição em minerais coexistentes e o líquido.

Palavras-chave:
Coeficiente de partição; plagioclásio; clinopiroxênio; Formação Serra Geral; LA-ICP-MS

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Acknowledgements

The first author wishes to thank CNPq and CAPES for the doctoral scholarship in Brazil and Germany, PRONEX-FAPERGS/CNPq (“Strategic Minerals”) for financial support. CPRM (Geological Survey Brazil) provided support and most of the sill samples. Stuttgart University provided Electron Microprobe facility and overall support.

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Publication Dates

  • Publication in this collection
    Apr-Jun 2011

History

  • Received
    31 Dec 2009
  • Accepted
    04 Oct 2011
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