Arcabouço Estrutural, Petrografia e Idades U-Pb em Zircão de Diques Intrusivos em Granitoides da Suíte Lagoa Dourada (2350 Ma) – Cinturão Mineiro, Sudeste do Brasil
DOI:
https://doi.org/10.11137/2020_4_66_81Keywords:
Cinturão Mineiro, crosta continental juvenil, enxame de diques SiderianosAbstract
A Suíte Lagoa Dourada (SLD), localizada no Cinturão Mineiro (CM), borda sul do Cráton São Francisco (CSF), datada em ca.2,35 Ga, é co mposta por biotita-hornblenda tonalitos cortados por uma rede de diques classificados em 5 diferentes tipos (Tipos 1 a 5). Esses tipos foram individualizados a partir de suas relações de corte e orientação espacial, obtidas com cartografia de 4 áreas alvos, além da composição modal e textura. Com características microestruturais majoritariamente ígneas, a foliação observada nestes diques
foi gerada durante a sua colocação, associada ao próprio fluxo magmático. As relações de corte observadas mostram que os diques Tipo 1 (ca. 2347 Ma) são os mais antigos, cuja idade obtida superpõe, dentro do erro analítico, a idade da rocha hospedeira. Esses diques foram alojados por meio de um sistema de fraturas sin-intrusivas provenientes da contração volumétrica do plúton durante a sua cristalização. O processo de ruptura da rocha hospedeira para a colocação dos demais tipos deve-se provavelmente ao fraturamento
provocado pela pressão magmática, tendo a intrusão mais jovem (Tipo 5, ca. 2332 Ma) ocorrido aproximadamente 20 Ma após a sua cristalização. Tem-se então o registro singular da produção de crosta em ca. 2350-2330 Ma para a SLD e diques nela intrusivos, tempo que corresponde a um período de carência global do registro de geração de crosta continental (2,45 e 2,2 Ga).
References
Almeida, F.F.M. 1977. O Cráton do São Francisco. Revista Brasileira de Geociências, 7: 349-364.
Araújo, J.F.V.; Bezerra, P.E.L.; Lima, M.I.C.; Kaul, P.F.T.; Rocha, R.M.; Siga-Júnior, O. & Gonzalez, S.R. 1998. Manual técnico de geologia. Rio de Janeiro, IBGE, 306 p.
Ávila, C.A.; Teixeira, W.; Cordani, U.G.; Moura, C.A.V. & Pereira, R.M. 2010. Rhyacian (2.23 2.20 Ga) juvenile accretion in the southern São Francisco craton, Brazil: Geochemical and isotopic evidence from the Serrinha magmatic suite, Mineiro belt. Journal of South American Earth Sciences, 29: 464-482.
Ávila, C.A.; Teixeira, W.; Bongiolo, E.M.; Dussin, I.A. & Vieira, T.A.T. 2014. Rhyacian evolution of subvolcanic and metasedimentary rocks of the southern segment of the Mineiro belt, São Francisco craton, Brazil. Precambrian Research, 243: 221–251.
Barbosa, N.S.; Teixeira, W.; Ávila, C.A.; Montecinos, P.M. & Bongiolo, E.M. 2015. 2.17–2.10 Ga plutonic episodes in the Mineiro belt, São Francisco Craton, Brazil: U-Pb ages, geochemical constraints and tectonics. Precambrian Research, 270: 204 - 225.
Barbosa, N.; Teixeira, W.; Ávila, C.A.; Montecinos, P.M.; Bongiolo, E.M. & Vasconcelos, F.F. 2019. U-Pb geochronology and coupled Hf-Nd-Sr isotopic-chemical constraints of the Cassiterita Orthogneiss (2.47–2.41-Ga) in the Mineiro belt, São Francisco craton: Geodynamic fingerprints beyond the Archean-Paleoproterozoic Transition. Precambrian Research, 326: 399-416.
Belousova, E.A.; Kostitsyn, Y.A.; Griffin, W.L.; Begg, G.C.; O’Reilly, S.Y. & Pearson, N.J. 2010. The growth of the continental crust: Constraints from zircon Hf-isotope data. Lithos, 119: 457–466.
Cawood, P.A.; Hawkesworth, C.J. & Dhuime, B. 2013. The continental record and the generation of continental crust. Geological Society of America Bulletin, 125(1–2): 14–32.
Condie, K.C. 1998. Episodic continental growth and supercontinents: a mantle avalanche connection? Earth and Planetary Science Letters, 163: 97–108.
Condie, K.C.; O'Neill, C. & Aster, R.C. 2009a. Evidence and implications for a widespread magmatic shutdown for 250 My on Earth. Earth and Planetary Science Letters, 282: 294–298.
Condie, K.C.; Belousova, E.; Griffin, W.L. & Sircombe, K.N. 2009b. Granitoid events in space and time: constraints from igneous and detrital zircon age spectra. Gondwana Research, 15: 228–242.
Cosgrove, J.W. 1995. The expression of hydraulic fracturing in rocks and sediments. Geological Society, London, Special Publications, 92(1): 187-196.
Condie, K.C. 1998. Episodic continental growth and supercontinents: a mantle avalanche connection? Earth and Planetary Science Letters, 163: 97–108.
Dhuime, B.; Hawkesworth, C.J.; Cawood, P.A. & Storey, C.D. 2012. A change in the geodynamics of continental growth 3 billion years ago. Science, 335: 1334-1336.
Diwu, C.; Sun, Y.; Zhao, Y. & Lai, S. 2014. Early Paleoproterozoic (2.45–2.20 Ga) magmatic activity during the period of global magmatic shutdown: Implications for the crustal evolution of the southern North China Craton. Precambrian Research, 255: 627-640.
Gasquet, D.; Barbey, P.; Adou, M. & Paquette, J. 2003. Structure, Sr–Nd isotope geochemistry and zircon U–Pb geochronology of the granitoids of the Dabakala area (Côted’Ivoire): evidence for a 2.3 Ga crustal growth event in the Palaeoproterozoic of West Africa? Precambrian Research, 127: 329–354.
Gerdes, A. & Zeh, A. 2006. Combined U-Pb and Hf isotope LA-(MC)-ICP-MS analyses of detrital zircons: comparison with SHRIMP and new constraints for the provenance and age of an Armorican metasediment in Central Germany. Earth and Planetary Science Letters, 249: 47-61.
Gill, R. 2014. Rochas e processos ígneos: um guia prático. Porto Alegre, Bookman, 427p.
Hawkesworth, C.J.; Cawood, P.A.; Kemp, A.I.S.; Storey, C. & Dhuime, B. 2009. Geochemistry: A matter of preservation. Science, 323: 49-50.
Hawkesworth, C.; Cawood, P.A. & Dhuime, B. 2013. Continental growth and the crustal record. Tectonophysics, 609: 651-660.
Hill, D.P. 1977. A model for earthquake swarms. Journal of Geophysical Research, 82: 1347–1352.
Jackson, S.E.; Pearson, N.J.; Griffin, W.L. & Belousova, E.A. 2004. The application of laser ablation-inductively coupled plasma-mass spectrometry to in-situ U–Pb zircon geochronology. Chemical Geology, 211: 47–69.
Ludwig, K.R. 2003. User’s Manual for Isoplot/Ex, Version 3.0, A geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center, Special Publication, 4: 73p.
Macambira, M.J.B.; Vasquez, M.L.; da Silva, D.C.C.; Galarza, M.A.; Barros, C.E.M. & Camelo, J.F. 2009. Crustal growth of the central-eastern Paleoproterozoic Bacajá domain, SE Amazonian craton: Juvenile accretion vs. reworking. Journal of South American Earth Sciences, 27: 235–246.
Moreira, H.; Seixas, L.; Storey, C.; Fowler, M.; Lasalle, S.; Stevenson, R. & Lana, C. 2018. Evolution of Siderian juvenile crust to Rhyacian high Ba-Sr magmatism in the Mineiro Belt, southern São Francisco Craton. Geoscience Frontiers, 9: 977-995.
Newall, G. & Rast, N. 1970. Mechanism of igneous intrusion. Liverpool, Geological Journal Special Issue, 2, Seel House Press, 380 p.
Noce, C.M.; Teixeira, W.; Quéméneur, J.J.G.; Martins, V.T.S. & Bolzachini, E. 2000. Isotopic signatures of Paleoproterozoic granitoids from southern São Francisco Craton, NE Brazil, and implications for the evolution of the Transamazonian Orogeny. Journal of South American Earth Sciences, 13: 225-239.
Partin, C.A.; Bekker, A.; Sylvester, P.J.; Wodicka, N.; Stern, R.A.; Chacko, T. & Heaman, L.M. 2014. Filling in the juvenile magmatic gap: evidence for uninterrupted Palaeoproterozoic plate tectonics. Earth and Planetary Science Letters, 388: 123–133.
Paterson, S.R.; Vernon, R.H. & Tobisch O.T. 1989. A review of criteria for the identification of magmatic and tectonic foliations in granitoids. Journal of Structural Geology, 11: 349–363.
Perkins, T.K. & Kern, L.R. 1961. Widths of hydraulic fractures. Journal of Petroleum Technology, 13 (09): 937-949.
Rubin, A.M. 1995. Propagation of magma-filled cracks. Annual Review of Earth and Planetary Sciences, 23(1): 287-336.
Santos, M.M.; Lana, C.; Sholz, R.; Buick, I.; Schmitz, M.D.; Kamo, S.L.; Gerdes, A.; Corfu, F. & Tapster, S. 2017. A new appraisal of Sri Lankan BB zircon as a reference material for LA-ICP-MS U-Pb geochronology and Lu-Hf isotope tracing. Geostandards and Geoanalytical Research, 41: 335 – 358.
Seixas, L.A.R.; David, J. & Stevenson, R. 2012. Geochemistry, Nd isotopes and U–Pb geochronology of a 2350 Ma TTG suite, Minas Gerais, Brazil: Implications for the crustal evolution of the southern São Francisco craton. Precambrian Research, 196-197: 61– 80.
Seixas, L.A.R.; Bardintzeff, J.M.; Stevenson, R. & Bonin, B. 2013. Petrology of the high-Mg tonalites and dioritic enclaves of the ca.2130 Ma Alto Maranhão suite: Evidence for a major juvenile crustal addition event during the Rhyacian orogenesis, Mineiro Belt, southeast Brazil. Precambrian Research, 238: 18– 41.
Sláma, J.; Košler, J.; Condon, D.J.; Crowley, J.L.; Gerdes, A.; Hanchar, J.M.; Horstwood, M.S.A.; Morris, G.A.; Nasdala, L.; Norberg, N.; Schaltegger, U.; Schoene, B.; Tubrett, M.N. & Whitehouse, M.J. 2008. Plešovice zircon – a new natural reference material for U–Pb and Hf isotopic microanalysis. Chemical Geology, 249: 1-35.
Smits, R.G.; Hand, R. & Collins, W.J. 2012. Insights into the 2300 Ma magmatic shutdown. Mineralogical Magazine Goldschmidt Conference abstracts, 2387p.
Spencer, C.J.; Murphy, J.B.; Kirkland, C.L.; Liu, Y. & Mitchell, R.N. 2018. A Palaeoproterozoic tectono-magmatic lull as a potential trigger for the supercontinent cycle. Nature Geoscience, 5p.
Stacey, J.S. & Kramers, J.D. 1975. Approximate of terrestrial lead isotope variation by a two-stage model. Earth Planet Science Letters, 26: 207-221.
Streckeisen, A. 1976. To each plutonic rock its proper name. Earth-Science Reviews, 12: 1-33.
Teixeira, W. 1985. A evolução geotectônica da porção meridional do cráton do São Francisco, com base em interpretações geocronológicas. Instituto de Geociências, Universidade de São Paulo, Tese de Doutorado, 207p.
Teixeira, W. & Figueiredo, M.C.H. 1991. An outline of Early Proterozoic crustal evolution in the São Francisco region, Brazil: a review. Precambrian Research, 53: 1–22.
Teixeira, W.; Ávila, C.A.; Dussin I.A.; Correa Neto, A.V.; Bongiolo, E.M.; Santos, J.O. & Barbosa, N. 2015. A juvenile accretion episode (2.35-2.32Ga) in the Mineiro belt and its role to the Minas accretionary orogeny: Zircon U-Pb-Hf and geochemical evidences. Precambrian Research, 256: 148-169.
Tzschichholz, F. & Wangen, M. 1999. Modellization of hydraulic fracturing of porous materials. Southampton, UK: WIT Press, 227–261.
Van Achterbergh, E.; Ryan, C.G.; Jackson, S.E. & Griffin, W.L. 2001. Data reduction software for LA-ICP-MS: appendix. In: SYLVESTER, P.J. (ed.). Laser Ablation-ICPMass Spectrometry in the Earth Sciences: Principles and Applications. Ottawa, Mineralog. Assoc. Canada (MAC) Short Course Series, 29, p. 239-243.
Vieira, R.R; Gonçalves, C.C. & Gonçalves, L. 2020. Evidências da colocação sintectônica de plutons revelada por estudos de campo, petrográficos, microestruturais e de química mineral: Estudo de caso da Suíte Alto Maranhão (2130 Ma), Cinturão Mineiro, Sudeste do Brasil. Anuário do Instituto de Geociências, 43(1): 376-396.
Downloads
Published
Issue
Section
License
This journal is licensed under a Creative Commons — Attribution 4.0 International — CC BY 4.0, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Except where otherwise noted, content on this site is licensed under a license 