Crustal model and heat flow in the Estância, Canudos-Vaza-Barris and Macururé domains bordering the emerged edge of Sergipe-Alagoas Basin
Keywords:
radiogenic heat production in rocks, earth-crust modeling, earth heat flowAbstract
We determine the heat flow in parts of the Sergipe- Alagoas Basin using models of the crust of the geotectonic domains that constitute the basement adjacent to the basin, which we assume to be present at the bottom of this. This basement is constituted by the Estância, Canudos-Vaza-Barris and Macururé domains in a strip of about 440km along the ocean coast and 50km wide from the edge of the onshore basin. We visited 1.483 basement outcrops and collected 1.623 rock samples from the various geological units present in which we determine the mass density, the K, U and Th contents and the volumetric rate of heat production. To calculate the heat flow produced in each domain, we use published data to estimate its thickness and of its substrate and used models to achieve the function A (z) of the vertical variation of heat production. In these models, we assume that the substrates is composed by rocks of the São Francisco Craton which are in amphibolite and granulite facies in the Estância and Vaza-Barris domains, and granulite facies in Macururé one. The results show that in the crust of the Estância and Vaza- Barris domains, heat production is due almost entirely to the cratonic rocks. The average geothermal flows of 66.9mW m-2, 63.1mW m-2 and 55.7mW m-2 obtained for the Estância, Vaza- Barris and Macururé domains, respectively, appear consistent with published average values of oil-fields heat flow in parts of the basin where these domains must be present. This agreement supports the validity of hypotheses about the constitution of the basement of the basin and on the lithological composition of the domains and their substrates. To explain the high discrepancy between the values measured and published on the northern edge of the Macururé Domain, we suggest that this domain may be thinner in its northern edge, or the Rio Coruripe unit, which forms that border, has a crustal composition different from that of the Macururé Domain.
References
ALMEIDA, F. F. M. O Cráton do São Francisco. Revista Brasileira de Geociências, São Paulo, v. 7, n. 4, p. 349 -364, 1977.
ASHWAL, L. D.; MORGAN, P.; KELLEY, S. A.; PERCIVA, J. A. Heat production in an Archean crustal profile and implications for heat flow and mobilization of heatproducting elements. Earth and Planetary Sciences Letters, Amsterdam, v. 85, n. 4, p. 439-450, Oct. 1987.
BIANCHI, M. B. Variações da estrutura da crosta, litosfera e manto para a plataforma Sul Americana através de funções do receptor para ondas P e S. 2008. 133 f. Tese (Doutorado) – Universidade de São Paulo, Instituto Astronômico e Geofísico, São Paulo, 2008.
BIRCH, F.; ROY, R. F.; DECKER, E. R. Heat flow and thermal history and New England and New York. In: (Ed.). ZEN, E.; WHITE, W. S.; HADLEY, J. B.; THOMPSON JUNIOR, J. B. Studies of Appalachian Geology: Northern and Maritime. New York: Interscience, 1968. p. 437-451.
BRITO NEVES, B. B. Regionalização Geotectônica do Pré-Cambriano Nordestino. 1975. 198 f. Tese (Doutorado) – Universidade de São Paulo, São Paulo, 1975.
BRITO NEVES, B. B.; SIAL, A. N.; ALBUQUERQUE, J. P. T. Vergência centrífuga residual no sistema de dobramentos Sergipano. Revista Brasileira de Geociências, São Paulo, v. 7, n. 2, p. 102-114, 1977.
BUENO, J. F.; SOUZA, J. J.; ARAÚJO, M. N. C.; OLIVEIRA, E. P. Evolução tectono-cronológica da estrutura de interferência de Nossa Senhora de Lourdes, Faixa Sergipana, NE-Brasil. Revista Brasileira de Geociências, São Paulo, v. 39, n. 4, p. 608-623, dez. 2009.
DAVISON, I.; SANTOS R. A. Tectonic evolution of the Sergipano Fold Belt, NE Brazil, during the Brasiliano Orogeny. Precambrian Research, Amsterdam, v. 45, n. 4, p. 319-342, Dec. 1989.
D’EL-REY SILVA, L. J. H. Tectonic evolution of the southern part of the Sergipano Fold Belt, northeastern Brazil. 1992. 257 f. PhD Thesis – University of London, England, Royal Holloway, 1992.
D’EL-REY SILVA, L. J. H.; McClay, K. R. Stratigraphy of the southern part of the Sergipano Belt, NE Brazil: tectonic implications. Revista Brasileira de Geociências, São Paulo, v. 25, n. 3, p.185-202, set. 1995a.
D’EL-REY SILVA, L. J. H. The evolution of basement gneiss domes of the Sergipano fold belt (NE Brazil) and its importance for the analysis of Proterozoic basins. Journal of South American Earth Sciences, Amsterdam, v. 8, n. 3-4, p. 325-340, July/Oct. 1995b.
D’EL-REY SILVA, L. J. H. Basin infilling in the southerncentral part of the Sergipano Belt (NE Brazil) and implications for the evolution of Pan-African/Brasiliano cratons and Neoproterozoic sedimentary cover. Journal of South American Earth Sciences, Amsterdam, v. 12, n. 5, p. 453-470, Sept. 1999.
DOMINGUEZ, J. M. L. As coberturas do Cráton São Francisco: uma abordagem do ponto de vista da análise de bacias. In: DOMINGUEZ, J. M. L.; MISI, A. (Ed.). O Cráton do São Francisco. Salvador: SBG, 1993. p. 137-159.
DRURY, M. Heat flow provinces reconsidered. Physicsof the Earth and Planetary Interiors, Amsterdam, v. 49, n. 1-2, p. 78-96, Nov. 1987.
FONTES, L. C. A. A. Determinação do fluxo geotérmico na bacia sedimentar Sergipe-Alagoas. 1980. 83 f. Dissertação (Mestrado) – Universidade Federal da Bahia, Salvador, 1980.
FOUNTAIN, D. M.; SALISBURY, M. H. Exposed crosssections through the continental crust: implications for the crustal structure, petrology and evolution. Earth and Planetary Sciences Letters, Amsterdam, v. 56, p. 263-277, Dec. 1981.
HAWKESWORTH, C. J. Vertical distribution of heat production in the basement of the Eastern Alps. Nature, v. 249, n. 5456, p. 435-436, May 1974.
KREMENTSKY, A. A.; OVCHINNIKOV, L. N. The Precambrian continental crust: is structure, composition, and evolution as revealed by deep drilling in the U.S.S.R. Precambrian Reseach, Amsterdam, v. 33, n. 1-3, p. 11-43, Sept. 1986.
KREMENTSKY, A. A.; MILANOVSKY, S. YU; OVCHINNIKOV, L. N. A heat generation model for continental crust based on deep drilling in the Baltic Shield. Tectonophysics, Amsterdam, v. 159, n. 3-4, p. 231-246, Mar. 1989.
LACHENBRUCH, A. H. Crustal temperature and heat production: Implications of the linear heat-flow relation. Journal of Geophysical Research, Malden MA, v. 75, n. 17, p. 3291-3300, Jan. 1970.
MOTTAGHY, D,; SCHELLSCHMIDT, R.; POPOV, Y. A.; CLAUSER, C.; KUKKONEN, L. T.; NOVER, G.; MILANOVSKY, S.; ROMUSHKEVICH, R. A. N. New heat data from the immediate vicinity of the Kola super deep borehole: vertical variation in heat flow confirmed and attributed to advection. Tectonophysics, Amsterdam, v. 401, n. 1 2, p. 119-142, May 2005.
MORGAN, P. Crustal radiogenic heat production and the selective survival of ancient continental crust. Part 2. Journal of Geophysical Research, Malden MA, v. 90, n. S02, p. C561-C570, Feb. 1985. Proceedings of 15th Lunar and Planetary Science Conference.
NEVES, S.P.; BRUGUIER, O.; VAUCHEZ, A.; BOSCH, D.; SILVA, J. M. R.; MARIANO, G. Timing of crust formation, deposition of supracrustal sequences, and Transamazonian and Brasiliano metamorphism in the East Pernambuco belt (Borborema Province, NE Brazil): implications for western Gondwana assembly. Precambrian Research, Amsterdam, v. 149, n. 3-4, p. 197-216, Sept. 2006.
NICOLAYSEN, L. O.; HART, R. J.; GALE, N. H. The Vredefort element profile extended to supracrustal strata et Carletonville, with implications for continental heat flow. Journal of Geophysical Research, Malden MA, v. 86, n. B11, p. 10653-12218, Jan. 1981.
OLIVEIRA, E. P., S. F. TOTEU, M. N. C. ARAÚJO, M. J. CARVALHO,.R. S. NASCIMENTO, J. F. BUENO, J. F.; MCNAUGHTON, N.; BASILICI, E. G. Geologic correlation between the Neoproterozoic Sergipano belt (NE Brazil) and the Yaoundé schist belt (Cameroon, Africa). Journal of African Earth Sciences, Amsterdam, v. 44, n. 4-5, p. 470-478, 2006.
OLIVEIRA, E. P.; WINDLEY, B. F.; ARAUJO, M. N. C. The Neoproterozoic Sergipano orogenic belt, NE Brazil: a complete plate tectonic cycle in western Gondwana. Precambrian Research, Amsterdam, v. 181, n. 1-4, p. 64-84, Aug. 2010.
OLIVEIRA, R. G. Arcabouço geofísico, isostasia e causa do magmatismo Cenozoico da Província Borborema e de sua margem continental (nordeste do Brasil). 2008. 411 f. Tese (Doutorado) – Universidade Federal do Rio Grande do Norte, Rio Grande do Norte, 2008.
OLIVEIRA, R. G.; SANTOS, E. J. Magnetic Framework of the Borborema Province, Northeast Brazil: an interpretation from digital data. Potential Field Methods: Case histories. In: INTERNATIONAL CONGRESS OF THE BRAZILIAN GEOPHYSICAL SOCIETY, 6., Rio de Janeiro, 1999. Proceedings... Rio de Janeiro: SBGf, 1999. p. 113. 1 CD-ROM.
PRIBNOW, D. F. C.; WINTER, H. R. Radiogenic heat production in the upper third of continental crust from KTB. Geophysical Research Letters, Malden MA, v. 24, n. 3, p. 349-352, Feb. 1997.
REYES, L. M. G. Distribuição vertical da taxa volumétrica de produção de calor radiogênico no Cráton do São Francisco. 2008. 156 f. Tese (Doutorado) – Universidade Federal da Bahia, Bahia, 2008.
REYES, L. M. G.; ARGOLO, R. M.; MARINHO, M. M. Repartição do fluxo térmico nas Bacias de Camamue Almada. In: SIMPÓSIO BRASILEIRO DE GEOFÍSICA DA SOCIEDADE BRASILEIRA DE GEOFÍSICA, 3., Belém do Pará, 2008. Anais... Belém do Pará: SBGf, 2008.
RYBACH, L. Amount and significance of radioactive heat sources in sediments. In: BURRUS, J. (Ed.) Thermal Modeling in Sedimentary Basins. Paris: Technip, 1986. p. 311-322.
SANTOS, E. J. Ensaio preliminar sobre terrenos e tectônica acrescionária na Província Borborema. In: CONGRESSO BRASILEIRO DE GEOLOGIA, 39., 1996, Salvador. Anais... Salvador, SBG, 1996. v. 6, p. 47-50.
SANTOS, E. J.; MEDEIROS, V. C. Constraints from granitic plutonism on proterozoic crustal growth of the Transverse Zone, Borborema Province, NE-Brazil. Revista Brasileira de Geociências, São Paulo, v. 29, n. 1, p.73-84, mar. 1999.
SANTOS, R. A.; MARTINS, A. A. M.; NEVES, J. P. Geologia e recursos minerais do estado de Sergipe. Salvador: CPRM, 1998.
SCHNEIDER, R. V.; ROY, R. F.; SMITH, A. R. Investigations and interpretations of the vertical distribution of U, Th and K: South Africa and Canada. Geophysical Research Letters, v. 14, n. 3, p. 264-267, Mar. 1975.
SILVA, J. M. R.; CAMPOS NETO, M. C.; BRITO NEVES, B.B. Deformação e metamorfismo principais de uma parte da Faixa Sul-Alagoana (Complexo Macururé), Sistema de Dobramentos Sergipano, nordeste do Brasil. Revista Brasileira de Geociências, São Paulo, v. 25, n. 4, p. 343-350, dez. 1995.
SILVA FILHO, M. A. Arco vulcânico de Canindé- Marancó e a Faixa Sul-Alagoana: sequências orogênicas Mesoproterozoicas. In: CONGRESSO BRASILEIRO GEOLOGIA, 40., 1998, Belo Horizonte. Anais... Belo Horizonte: SBG, 1998. v. 1, p. 16.
SILVA FILHO, M. A.; TORRES, H. H. F. A new interpretation on the Sergipano Belt Domain. Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 74, n. 3, p. 556-557, 2002.
SMITHSON, S. B.; DECKER, E. R. A continental crustal model and its geothermal implications. Earth Planetary Science Letters, Amsterdam, v. 22, n.3, p. 215-225, 1974.
TROMPETTE, R. Geology of Western Gondwana (200-500 Ma) Pan-African-Brasiliano aggregation of South America and Africa. A. A. Balkema, Rotterdam Brookfield, 1994. 350 p.
TROMPETTE, R. Neoproterozoic (~600 Ma) aggregation of Western Gondwana: a tentative scenario.b Precambrian Research, Amsterdam, v. 82, n. 1-2, p. 101-112, Mar. 1997.
TROMPETTE, R. Gondwana evolution; its assembly at around ~ 600 Ma. Comptes Rendus de l’ Académie Sciences de Paris, Series 2A – Earth and Planetary Science, v. 330, n. 5, p. 305-315, Mar. 2000.
VAN SCHMUS, W. R.; BRITO NEVES, B. B.; HACKSPACHER, P. C.; BABINSKI, M. U/Pb and Sm/Nd geochronologic studies of the eastern Borborema Province, Northeast Brazil: initial conclusions. Journal of South American Earth Sciences, Amsterdam, v. 8, n. 3-4, p. 267-288, July/Oct. 1995.
VAN SCHMUS, W. R., KOZUCH, M., BRITO NEVES, B. B. Precambrian history of the Zona Transversal of the Borborema Province, NE Brazil: insights from Sm-Nd and U-Pb geochronology. Journal of South American Earth Sciences, Amsterdam, v. 31, n. 2-3, p. 227-252, Mar. 2011.
VILLENEUVE, M.; CORNÉE, J. J. Structure, evolution and palaeogeography of the West African craton and bordering belts during the Neoproterozoic. Precambrian Research, Amsterdam, v. 69, n. 1-4, p. 307-326, Oct. 1994.
VITORELLO, I.; POLLACK, H. N. On the variation of continental heat flow with age and the thermal evolution of continents. Journal of Geophysical Research, Malden MA, v. 85, n. B2, p. 985-995, Jan. 1980.
WINTER, J. D. An introduction to igneous and metamorphic petrology. Prentice Hall, 2001. 699 p.
