Isotopic signatures of neoproterozoic to cambrian ultrapotassic syenitic magmas, northeastern brazil: Evidence for an enriched mantle source

International Geology Review

Volumn 39, Issue 7, 1997, Pages 660-669

  Ferreira, Valderez P ^a   Sial, Alcides N ^a   Long, Leon E ^b   Pin, Christian ^c  

^a FEDERAL UNIVERSITY OF PERNAMBUCO   (Brazil)

^b UNIVERSITY OF TEXAS AT AUSTIN   (United States)

^c UNIVERSITÉ CLERMONT AUVERGNE   (France)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000876207     PISSN: 00206814     EISSN: 19382839     Source Type: Journal    
DOI: 10.1080/00206819709465294     Document Type: Article

References (30)

1. de Brito Neves, B. B., 1984. O mapa geológico do nordeste oriental do Brasil, escala 1:1,000,000, 177Univ. São Paulo. Unpubl. doctoral thesis
2. Cordani, U. G., Teixeira, W., Tassinari, C. C. G., and Kawashita, K., 1988. The growth of the Brazilian shield. Episodes, 11 (3):163–167.
3. Davison, I., McCarthy, M., Powell, D., Torres, H. H. F., and Santos, C. A., 1995. Laminar flow in shear zones:The Pernambuco shear zone, NE Brazil. Jour. Struc. Geol., 17:149–161.
4. DePaolo, D., 1988. Neodymium isotope geochemistry:An introduction, Berlin:Springer-Verlag.
5. Faure, G., 1986. Principles of isotope geology, 589New York:John Wiley and Sons.
6. Ferreira, V. P., and Sial, A. N., 1986. The peralkalic magmatism in the Precamhrian Cachoeirinha-Salgueiro foldbelt, Northeast Brazil:Geochemical aspects. Rev. Bras. Geoc, 16:73–85.
7. Ferreira, V. P., and Sial, A. N., 1993. “ Mica pyroxenite as probable source for ultrapotassic and potassic magmas in northeastern Brazil ”. In Workshop Gran. Magmat. Assoc. Min. (MAGMA), Edited by:Sial, A. N., and Ferreira, V. P., Vol. 65, 51–62. Rio de Janeiro:Acad. Bras. Cien.
8. Ferreira, V. P., Sial, A. N., and Whitney, J. A., 1994. Large-scale silicate liquid immiscibility:A possible example from northeastern Brazil. Lithos, 33:285–302.
9. Ferreira, V. P., Sial, A. N., and Cruz, M. J. M., 1995. “ Mineral chemistry of mica-pyroxenite xenoliths in Neoproterozoic ultrapotassic syenitic magmas, NE Brazil ”. In Symp. Phys. Chem. Upper Mantle, Edited by:Cordani, U. G., and Svisero, D. P., Vol. v. 67, 307–320. Acad. Bras. Cien.
10. Foley, S. F., Venturelli, G., Green, D. H., and Toscani, L., 1987. The ultrapotassic rocks:Characteristics, classification, and constraints for petrogenetic models. Earth Sci. Rev., 24:81–134.
11. Guimarães, I. P., da Silva Fitho, A. F., Nolan, J., and Williams, T., 1993. “ The mineral chemistry of the Brasiliano-age Bom Jardim and Toritama shoshonitic complexes, state of Pernambuco, northeast Brazil ”. In Workshop Gran. Magnaat. Assoc. Min. (MAGMA), Edited by:Sial, A. N., and Ferreira, V. P., Vol. 65, 83–106. Rio de Janeiro:Acad. Bras. Cien.
12. Hutton, D. H. W., 1992. Granite sheeted complexes:Evidence for the dyking ascent mechanism. Trans. Royal Soc. Edinb., Earth Sci., 83:377–382.
13. Katsura, T., and Nagashima, S., 1974. Solubility of sulfur in some magmas at 1 atmosphere. Geochim. et Cosmochim. Acta, 38:517–531.
14. Nelson, D. R., McCulloch, M. T., and Shen, S. -S., 1986. The origin of ultrapotassic rocks as inferred from Sr, Nd, and Pb isotopes. Geochim. et Cosmochim. Acta, 50:231–245.
15. Pin, C., and Carme, F., 1987. A Sm-Nd isotope study of 500-Ma-old oceanic crust in the Variscan belt of Western Europe:The Chaurpusse ophiolite complex, western Alpes, France. Contrib. Mineral. Petrol., 96:406–413.
16. 146Nd, a natural tracer:An application to oceanic basalts. Earth Planet. Sci. Lett., 31:269–278.
17. Rogers, N. W., Hawkesworth, C. J., Parker, R. J., and Marsh, J. S., 1985. The geochemistry of potassic lavas from Vulsini, central Italy, and implications for mantle enrichment process beneath the Roman region. Contrib. Mineral. Petrol., 90:244–257.
18. Sakai, H., 1968. Isotopic properties of sulfur compounds in hydrothermal processes. Geochem. Jour., 2:29–49.
19. Sakai, H., Ueda, A., and Field, C. W., 1978. “ 34S and concentrations of sulfide and sulfate sulfurs in some ocean-floor basalts and serpentinites ”. In Short papers of the Fourth Int. Conf., Geochronology, Cosmochronology, and Isotope Geology, Edited by:Zartman, R. E., 372–374. Washington, DC:U.S. Geol. Surv.
20. dos Santos, E. J., and de Brito Neves, B. B., 1993. “ Petrogenesis and tectonic setting of the Lagoa das Pedras magmatism, Floresta, state of Pernambuco, Borborema province, northeast Brazil ”. In Workshop Gran, Magmat. Assoc. Min. (MAGMA), Edited by:Sial, A. N., and Ferreira, V. P., Vol. 65, 131–140. Acad. Bras. Cien.:Rio de Janiero.
21. 2O as a model for hybridization between hydrous siliceous melts and peridotite. Contrib. Mineral. Petrol., 79:368–374.
22. Sial, A. N., and Ferreira, V. P., 1990. Granitoids in northeastern Brazil:Oxygen and sulfur isotope compositions and depth of emplacement. Jour. South Amer. Earth Sci., 3:103–112.
23. Sial, A. N., Fodor, R. V., and Long, L. E., 1991. “ Peridotite xenoliths and Tertiary alkalic basalts in northeastern Brazil ”. In 5th. Int. Kimb. Conf., Field excursion guide, Araxa, Brazil, Edited by:Leonardos, H., Meyer, H. O. A., and Gaspar, J. C., 1–15. Brasilia:Companhia de Pesquisa de Recursos Minerais.
24. Silva, M. E., and Vauchez, A., 1992. Cisaíhamento de urna crosta parcialmente fundida:O falhamento de Pernambuco-oeste (NE Brasil):Bot. Res. Exp., Cong. Bras. Geol. São Paulo, Soc. Bras. Geol., 2:375–376.
25. 86Sr systematics on igneous rocks. Earth Planet. Sci. Lett., 47:243–254.
26. Taylor, H. P., Jr., Turi, B., and Cundari, A., 1984. 18O/16O and chemical relationships in K-rich volcanic rocks from Australia, East Africa, Antarctica, and San Venanzo-Cupaello, Italy. Earth Planet. Sci. Lett., 60:263–276.
27. Ueda, A., and Sakai, H., 1984. Sulfur isotope study of Quaternary volcanic rocks from the Japanese island arc. Geochim. et Cosmochim. Acta, 48:1837–1848.
28. Van Schmus, W. R., de Brito Neves, B. B., Hackspacher, P., and Babinski, M., 1995. U/Pb and Sm/Nd geo-chronologic studies of eastern Borborema province, northeastern Brazil:Initial conclusions. Jour. South Amer. Earth Sci., 8:267–288.
29. Wood, D. A., 1979. A variable veined sub volcanic upper mantle-genetic significance for mid-ocean ridge basalts from geochemical evidences. Geol., 7:499–503.
30. Wyllie, P., and Sekine, T., 1982. The formation of mantle phlogopite in subduction zone hybridization. Contrib. Mineral. Petrol., 79:375–380.