Microstructural Evolution Of The Seridó Belt, Ne-brazil: The Effect Of Two Tectonic Events On Development Of C-axis Preferred Orientation In Quartz

The polyphase evolution of the Seridó Belt (NE-Brazil) includes D1 crust formation at 2.3-2.1 Ga, D2 thrust tectonics at 1.9 Ga and crustal reworking by D3 strike-slip shear zones at 600 Ma. Microstructural investigations within mylonites associated with D2 and D3 events were used to constrain the tectono-thermal evolution of the belt. D2 shear zones commenced at deeper crustal levels and high amphibolite facies conditions (600-650 °C) through grain boundary migration, subgrain rotation and operation of quartz 〈c〉-prism slip. Continued shearing and exhumation of the terrain forced the re-equilibration of high-T fabrics and the switching of slip systems from 〈c〉-prism to positive and negative 〈a〉-rhombs. During D3, enhancement of ductility by dissipation of heat that came from syn-D3 granites developed wide belts of amphibolite facies mylonites. Continued shearing, uplift and cooling of the region induced D3 shear zones to act in ductile-brittle regimes, marked by fracturing and development of thinner belts of greenschist facies mylonites. During this event, switching from 〈a〉-prism to 〈a〉-basal slip indicates a thermal path from 600 to 350 °C. Therefore, microstructures and quartz c-axis fabrics in polydeformed rocks from the Seridó Belt preserve the record of two major events, which includes contrasting deformation mechanisms and thermal paths. © 2003 Elsevier Ltd. All rights reserved.251220892107Affaton, P., Rahaman, M.A., Trompette, R., Sougy, J., The Dahomeyde orogen: Tectonothermal evolution and relationships with the Volta basin (1991) The West African Orogens and Their Circum-Atlantic Correlatives, pp. 101-122. , R. D. Dallmeyer, and J. P. Lércorché (Eds.), Berlin: Springer-VerlagAraújo, M.N.C., Alves da Silva, F.C., Jardim de Sa, E.F., Pegmatite emplacement in the Seridó Belt, Northeastern Brazil: Late stage kinematics of the Brasiliano Orogen (2001) Gondwana Research, 1, pp. 75-85Archanjo, C.J., Bouchez, J.L., Le Seridó, une chaine transpressive dextre au Protérozoique supérieur du Nord-Est du Brésil (1991) Bulletin de la Societé Geologique de France, 162, pp. 637-647Archanjo, C.J., Salim, J., Posição da Formação Seridó no contexto estratigráfico regional (RN-PB) (1986) SBG Abstracts, Simpósio de Geologia Do Nordeste, 12, pp. 270-281Bell, T.H., Johnson, S.E., The role of deformation partitioning in the deformation and recrystallization of plagioclase and K-feldspar in the Woodroffe thrust zone, central Australia (1989) Journal of Metamorphic Geology, 7, pp. 151-168Bertrand, J.M., Jardim de Sá, E.F., Where are the Eburnean-Transamazonian Collisional Belts? (1990) Canadian Journal of Earth Sciences, 27, pp. 1382-1393Blacic, J.D., Plastic deformation mechanisms in quartz the effect of water (1975) Tectonophysics, 2, pp. 171-194Blumenfeld, P., Bouchez, J.L., Mainprice, D., C-slip in quartz from subsolidus deformed granite (1986) Tectonophysics, 127, pp. 97-115Bouchez, J.L., Pêcher, A., The Himalayan main central thrust pile and its quartz-rich tectonites in Central Nepal (1981) Tectonophysics, 78, pp. 23-50Boullier, A.M., The Pan-African Trans-Saharan Belt in the Hoggar Shield (Algeria, Mali, Niger): A review (1991) The West African Orogens and Their Circum-Atlantic Correlatives, pp. 85-105. , R. D. Dallmeyer, & J. P. Lércorché (Eds.), Berlin: Springer-VerlagCaby, R., Arthaud, M., Archanjo, C.J., Lithostratigraphy and petrostructural characterisation of supracrustal units in the Brasiliano Belt of Northeast Brazil: Geodynamic implications (1995) Journal of South American Earth Sciences, 8, pp. 235-246Corsini, M., Figueiredo, L.L., Caby, R., Féraud, G., Ruffet, G., Vauchez, A., Thermal history of the Pan-African/Brasiliano Borborema Province of northeast Brazil deduced from 40Ar/39Ar analysis (1998) Tectonophysics, 285, pp. 103-117Dantas, E., Van Schmus, W.R., Hackspacher, P.C., Fetter, A., Brito Neves, B.B., (1999) Identification of Multiple Orogenic/metamorphic Events in Polycyclic TerranesPossibilities and Limitations, 1, pp. 15-17. , Insights from the Borborema Province, NE Brazil. Abstracts, International Symposium in Tectonics of the SBG, Lençois, Bahia, BrazilDrury, M.R., Urai, J.L., Deformation-related recrystallization processes (1990) Tectonophysics, 172, pp. 235-253Duebendrofer, E.M., Housten, R.S., Proterozoic accrectionary tectonics at the southern margin of the Archean Wyoming craton (1987) Geological Society of America Bulletin, 98, pp. 554-568Fonseca, V.P., Barbalho, A.H.P., Jardim de Sá, E.F., Metamorfismo barroviano na Faixa Seridó e seu contexto tectônico: Caso da região de Lages (RN) (1991) SBG Abstracts, Simpósio de Geologia Do Nordeste, 4 (1), pp. 240-243Fueten, F., Tectonic interpretations of systematic variations in quartz c-axis fabrics across the Thompsom Belt (1992) Journal of Structural Geology, 14, pp. 775-789Galindo, A.C., Dall'Agnol, R., McReath, I., Sheller, T., Geocronologia dos granitóides brasilianos da região de Caraúbas-Umarizal, Oeste do Rio Grande do Norte (1993) SBG Abstracts, Simpósio de Geologia Do Nordeste, Recife, 1, pp. 325-328Garbut, J.M., Teyssier, C., Prism 〈c〉 slip in quartzites of the Okhurst mylonite belt, California (1991) Journal of Structural Geology, 13, pp. 657-666Gleason, G.C., Tullis, J., Heidelbach, F., The role of dynamic recrystallization in the development of lattice preferred orientations in experimentally deformed quartz aggregates (1993) Journal of Structural Geology, 15, pp. 1145-1168Hippertt, J.F., Microstructures and c-axis fabrics indicative of quartz dissolution in sheared quartzites and phyllonites (1994) Tectonophysics, 229, pp. 141-163Hippertt, J.F., Tohver, E., On the development of zones of reverse shearing in mylonitic rocks (1999) Journal of Structural Geology, 21, pp. 1603-1614Hirth, G., Tullis, J., Dislocation creep regimes in quartz aggregates (1992) Journal of Structural Geology, 14, pp. 145-159Jardim de Sá, E.F., Macedo, M.H.F., Pecaut, J.J., Kawashita, K., Souza, Z.S., Bertrand, J.M., Pré-brasiliano orogenic evolution in the Seridó Belt, NE Brazil: Conflicting geochronological and structural data (1995) Revista Brasileira de Geociências, 25, pp. 107-146Jardim de Sá, E.F., Trindade, R.I.F., Hollanda, M.H.B.M., Araújo, J.M.M., Galindo, A.C., Amaro, V.E., Souza, Z.S., Lardeaux, J.M., (1999) Brasiliano Syntectonic Granites Emplaced in a Strike Slip/extensional Setting (eastern Seridó Belt, NE Brazil), 71, pp. 17-27. , Anais da Academia Brasileira de CiênciasJessel, M.W., Lister, G.S., A simulation of the temperature dependence of quartz fabrics (1990) Deformation Mechanisms, Rheology and Tectonics, 54, pp. 353-362. , Knipe, R.J., Rutter, E.H. (Eds.), Geological Society Special PublicationKozuch, M., Van Schmus, W.R., Brito Neves, B.B., Ages and isotope geochemistry of two pre-brasiliano magmatic events in the Borborema Province of NE Brazil (1997) South American Symposium on Isotope Geology, Abstracts, pp. 157-160Legrand, J.M., França, V.M.Q., Implicação geotectônica do metamorfismo brasiliano da Faixa Seridó (RN) e suas relações com os granitóides intrusivos (1989) SBG Abstracts, Simpósio Nacional de Estudos Tectônicos, 2, pp. 233-236Leterrier, J., Jardim de Sá, E.F., Bertrand, J.M., Pin, C., (1994) Ages U-Pb sur Zircon de Granitoides "brasiliano" de La Ceinture Do Seridó, 318, pp. 1505-1511. , Comptes Rendus de l'Académie des Science de Paris II, (Province Borborema, NE Brésil)Lister, G.S., Crossed girdle c-axis fabrics in quartzites plastically deformed by plane strain and progressive simple shear (1977) Tectonophysics, 39, pp. 51-54Lister, G.S., Dornsiepen, U.L., Fabric transitions in the Saxony granulite terrane (1982) Journal of Structural Geology, 4, pp. 81-92Lister, G.S., Price, G.P., Fabric development in a quartz feldspar mylonite (1978) Tectonophysics, 49, pp. 37-78McLaren, A.C., (1991) Transmission Electron Microscopy of Minerals and Rocks, , Cambridge: Cambridge University PressMainprice, D., Bouchez, J.L., Blumenfeld, P., Tubia, J.M., Dominant c slip in naturally deformed quartz: Implications for dramatic plastic softening at high temperature (1986) Geology, 14, pp. 819-822Mazurek, M., Phase-equilibria and oxygen isotopes in the evolution of metapelitic migmatites-a case-study from the pre-alpine basement of Northern Switzerland (1992) Contributions to Mineralogy and Petrology, 109, pp. 494-510Neves, S.P., Vauchez, A., Feraud, G., Tectono-thermal evolution, magma emplacement and shear zone development in the Caruaru area (Borborema Province, NE Brazil) (2000) Precambrian Research, 99, pp. 1-32Passchier, C.W., Trouw, R.A.J., (1996) Microtectonics, , Berlin: Springer-VerlagRalser, S., Microstructural constraints on timing of Proterozoic deformation in Central New Mexico (2000) Journal of Metamorphic Geology, 18, pp. 457-466Ramsay, J.G., Hubber, M.I., (1987) The Techniques of Modern Structural Geology and Strain Analysis, , London: Academic PressSchmid, S.M., Casey, M., Complete fabric analysis of some commonly observed quartz c-axis patterns (1986) Mineral and Rocks Deformation: Laboratory Studies-The Patterson Volume, 36, pp. 263-286. , Hobbs, B.E., Heard, H.C. (Eds.), American Geophysicists Union, Geophysical MonographSmith, D.L., Evans, B., Diffusional crack healing in quartz (1984) Journal of Geophysical Research, 89, pp. 4125-4136Souza, L.C., (1996) Zoneographie Metamorphique, Chimie des Mineraux, Petrochimie, Geochronologie 40Ar/39Ar Et Histoire P-T-t Des Micaschistes Englobant Le Massif Gabro-granitique D'Acari (Brasiliano), Ceinture Moblile Du Seridó (NE Du Bresil), , Unpublished PhD Thesis, Université de LouvainTullis, J., Deformation of feldspars (1983) Feldspar Mineralogy, pp. 297-323. , P. H. Ribbe (Ed.), : Mineralogical Society of AmericaVan Schmus, W.R., Brito Neves, B.B., Williams, I.S., Fetter, A.H., Hackspacher, P.C., The Seridó Group, NE Brazil: A Late Neoproterozoic (650 Ma), pre-collisional, Brasiliano Flysch Basin? (2000) SBG, International Geological Congress, 31. , Rio de Janeiro, Brazil, CD-RomVauchez, A., Neves, S., Caby, R., Corsini, M., Egydio-Silva, M., Arthaud, M., Amaro, V., The Borborema shear zone system, NE Brazil (1995) Journal of South American Earth Sciences, 8, pp. 247-266White, J.C., Mawer, C.K., Deep-crustal deformation textures along megathrusts from Newfoundland and Ontario: Implications for microstructural preservation, strain rates, and strength of the lithosphere (1992) Canadian Journal of Earth Sciences, 29, pp. 328-337Wolfgan, U., Kurz, W., Progressive development of lattice preferred orientation (LPOs) of naturally deformed quartz within a transpressional collision zone (Panafrican Orogen in the Eastern Desert of Egypt) (2000) Journal of Structural Geology, 22, pp. 1827-1835Yardley, B.W.D., (1989) an Introduction to Metamorphic Petrology, , London: Logman Group UK Lt