Plagioclase geothermometry for some mesozoic and tertiary basalts, northeasr Brazil

Authors

  • Alcides Nóbrega Sial Departamento de Geologia, Centro de Tecnlogia. UFPE. Recife, PE.
  • Pedro Luiz Pretz Sartori Departamento de Geociências, Centro de Ciências Naturais e Exatas - CCNE Universidade Federal de Santa Maria - UFSM, Santa Maria, RS.

DOI:

https://doi.org/10.5902/2179460X24848

Abstract

Chemical data of some Tertiary olivine basaltic samples from the States of Rio Grande do Norte and Paraíba, and of Mesozoic tholeiitic basalts from the Maranhão sedimentary basin as well, allowed a preliminar estimate of the crystalization temperatures of their plagioclases through the KUDO and WELL’s geothermometer (5).

In the calculation of the equilibrium temperatures between the plagioclase crystals and the liquid, the chemical composition of their edges and the composition of the rock matrix were used.

In olivine basalts, temperatures rangibg from 1078 °C to 11680 ° C at 1 Kbar water pressure were recorded, in accordance with previously determined temperatures through HAKLI and WRIGHT’s (3) approach (SIAL, 8). For the tholeiitic basalts, temperature estimates ranged from 1140 °C to 1230 ° C, at 1 Kbar water pressure.

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Author Biographies

Alcides Nóbrega Sial, Departamento de Geologia, Centro de Tecnlogia. UFPE. Recife, PE.

Pedro Luiz Pretz Sartori, Departamento de Geociências, Centro de Ciências Naturais e Exatas - CCNE Universidade Federal de Santa Maria - UFSM, Santa Maria, RS.

References

BOWEN, N.L. The melting phenomena of the plagioclase feldspars . Am. J. Sci., Ser. 4, 35 : 577 - 599, 1913.

BOYD, F.R.; FINGER, L.W.; CHAYES, F. Computer reductions of eléctron probe data. Carn. Inst. or Washington. Year Book 67, 1529, p. 210, 1969.

HAKLI, T.A. & WRIGHT, T.L. The fractionation of nickel between ilovine and augite as a geothermometer. Geochim. et cosmochim.Acta, 31 (5) : 877 - 884, 1967.

IRVINE, T.N. & BARAGAR, W.R.A. A guide to the chemical classification of the commom volcanic rocks. Can. J. Earth Sci., 8: 523-548, 1971.

KUDO, A.M. & WEILL, D.F. An igneous plagioclase thermometer. Contr. Miner. and Petrol., 25 : 52 - 65, 1970.

MATHEZ, E.A. Refinement of the KUDO-WEILL plagioclase thermometer and its application to basaltic rocks. Contr. Miner. and Petrol., 11 : 61 - 72, 1973.

SIAL, A. N. Petrotogy and tectonie significanes of the post - Paleozoic basaltic rocks of Northeast Brazil. Davis, Univ. of California. 1974, 403 p. (Ph.D. Dissertation).

SIAL, A.N. Fracionamento de Ni entre olivina e augita e a temperatura de cristalização dos basaltos Terciários do Rio Grande do Norte e Paraíba. In: SIMPOSIO DE GEOLOGIA DO NORDESTE, VII, 1975. Atas... Fortaleza. SBG. Bol. nº 5 : 242 - 246.

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Published

1979-12-10

How to Cite

Sial, A. N., & Sartori, P. L. P. (1979). Plagioclase geothermometry for some mesozoic and tertiary basalts, northeasr Brazil. Ciência E Natura, 1(1), 79–88. https://doi.org/10.5902/2179460X24848

Issue

CIÊNCIA E NATURA, V. 1, N. 1, 1979

Section

Articles

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