8 research outputs found
Airborne Geophysical And Tectonics Of The Ceará Central Domain, Eastern Region Of The Santa Quitéria Magmatic Arc, Borborema Province, Ne Brazil
The airborne geophysical data gamma-spectrometric and magnetic from Itatira Project (1977) was carried out, in the central region of the State of the Ceará, Brazil. Their processing produced products useful to indirectly identity regional geologic features. The verification and applicability of this approach was tested in a pilot-area whose limits are within the Umirim and Canindé topographic sheets, at 1:100,000 scale. The integration between the airborne geophysical and the geologic field data supported to the geologic mapping at the same cited scale. Two main units were recognized: the Santa Quitéria magmatic arc and the supracrustal sequences that surround the arc. The rocks from Santa Quitéria magmatic arc are characterized by high counting on the K-channel in its almost entire region and intermediate and low counting of eTh and eU. Generally, the supracrustal sequences are characterized by high values on the eU-and-eTh-channels and low on K-channel. The subunit metaultramafics and, mafics granulites, are remarkable by the occurrence retrograde eclogites bands and mafic granulites as lenses within gneisses and migmatites. These subunits present strong negative anomalies, with low counting on the three K, eTh and eU channels. That area also has positive magnetic anomalies, and may reflect high values of magnetic susceptibility.264527542ALMEIDA FFM, HASUIY, BRITO NEVES BB & FUCK RA. 1981. Brazilian structural provinces: An Introduction. Earth-Science Reviews, 17:1-29AMARAL WS. 2007. Integração de Dados Aerogeofísicos e Geológicos e sua Contribuição a Evolução Geodinâmica do Domínio Ceará Central, Província Borborema. Instituto de Geociências, Universidade Estadual de Campinas (UNICAMP), Dissertação de Mestrado, 165 pATTOH, K., High-pressure granulite facies metamorphism In the Pan-African Dahomeyide orogen, West Africa (1998) Journal of Geology, 106, pp. 236-246ARTHAUD MH. 2007. Evolução neoproterozóica do Grupo Ceará (Domínio Ceará Central, NE Brasil): da sedimentação à colisão continen- tal brasiliana. Instituto de Geociências, Universidade de Brasilia, Brasilia, Tese de Doutoramento. 132 pARTHAUD MH, CABY R, FUCK RA, DANTAS EL & PARENTE CV. 2008. Geology of the northern Borborema Province, NE Brazil and its correla- tion with Nigeria, NW Africa. In: PANKHURST RJ, TROUW RAJ, BRITO NEVES BB & DEWIT MJ (Org.). West Gondwana: Pre-Cenozoic Corre- lations Across the South Atlantic Region. London, Geological Society of London, Special Publications, 294: 49-67BLUM, M.L.B., JOST, H., MORAES, R.A.V., PIRES, A.C.B., Caracteriza- ção dos complexos ortognáissicos arqueanos de Goiás por gamaespec- trometria aérea. (2003) Revista Brasileira de Geociências, 33 (2). , suplemento 147-152BRITO NEVES, B.B., CORDANI, U.G., Tectonic evolution of South America during the Late Proterozoic (1991) Crustal Evolution In the Late Proterozoic, 53, pp. 23-40. , STERN RJ & VAN SCHMUS WR Ed, Precambrian ResearchBRITO NEVES, B.B., PASSARELLI, C.R., BASEI, M.A.S., SANTOS, E.J., U-Pb Zircon ages of some classic granites of the Borborema Province (2003) IV South American Symposium on Isotope Geology, , Salvador, Brazil, Short Papers, 158-159CABY, R., Precambrian terranes of Benin-Nigeria and northeast Brazil and the Late Proterozoic south Atlantic fit (1989) Geological Society of America Special Paper, 230, pp. 145-158CABY, R., Terrane assembly and geodynamic evolution of central- western Hoggar: A synthesis (2003) Journal of African Earth Sciences, 37, pp. 133-159CABY, R., ARTHAUD, M.H., Major Precambrian nappes of the Brazilian Belt, Ceará, Northeast Brazil (1986) Geology, 14, pp. 871-874CASTRO, N.A., (2004) Evolução Geológica Proterozóica da Região en- tre Madalena e Taperuaba, Domínio Tectônico Ceará Central (Província Borborema), , Instituto de Geociências, Universidade de São Paulo, Tese de Doutoramento, 221 pCAVALCANTE, J.C., VASCONCELOS, A.M., MEDEIROS, M.F., PAIVA, I.P., GOMES, F.E.M., CAVALCANTE, S.N., CAVALCANTE, J.E., BENEVIDES, H.C., (2003) Mapa Geológico do Estado do Ceará, , Escala 1:500.000. Fortaleza, Ministério das Minas e Energia/Companhia de Pesquisa de Recursos Minerais. CD-ROMCPRM (Serviço Geológico do Brasil). 1977. Levantamento Aerogeo- físico. Série 2000, Projeto Itatira. CPRM- NUCLEBRÁSDEBEGLIA, N., CORPEL, J., Automatic 3-D interpretation of poten- tial field data using analytic signal derivatives (1997) Geophysics, 62, pp. 87-96FERREIRA, V.P., SIAL, A.N., JARDIM, D.S.E., Geochemical and isotopic signatures of Proterozoic granitoids in terranes of the Borbo- rema structural province, northeastern Brazil (1995) Journal of South American Earth Science, 11 (5), pp. 419-455FETTER, A.H., (1999) U-Pb and Sm-Nd geochronological constraints on the crustal framework and geologic history of Ceará State, NW Borbo- rema Province, NE Brazil: Implications for the assembly of Gondwana, , Ph.D. thesis, Department of Geology, Kansas University, Lawrence, KS- USA,164pFETTER, A.H., SANTOS, T.J.S., VAN SCHMUS, W.R., HACKSPACHER, P.C., BRITO NEVES, B.B., ARTHAUD, M.H., NOGUEIRA, J.A., WERNICK, E., Evidence for Neoproterozoic Continental Arc Magmatism in the Santa Quitéria Batholith of Ceará State, NW Borborema Province, NE Brazil: Implications for the Assembly of West Gondwana (2003) Gondwana Research, 6 (2), pp. 265-273GARCIA, M.G.M., ARTHAUD, M.H., Caracterização de trajetória P-T em nappes brasilianas: Região de Boa Viagem/Madalena - Ceará Cen- tral (NE Brasil) (2004) Revista de Geologia, 17, pp. 173-191. , Universidade Federal do CearáMENDONÇA, J.C.G.S., CAMPOS, M., BRAGA, A.P.G., SOUZA, E.M., FAVALI, J.C., LEAL, J.R.L.V., Jazida de Urânio de Itataia-CE (1984) Principais Depósitos Minerais do Brasil, 1, pp. 121-131. , DNPMMILLIGAN, P.R., GUNN, P.J., (1997) Enhancement and presentation of airborne geophysical data. AGSO Journal of Australian Geology & Geo- physics, 17 (2), pp. 63-75MINTY, B.R.S., Simple Micro-Levelling for Aeromagnetic Data (1991) Expl. Geophys, 22, pp. 591-592PARENTE CV, SILVA FILHO WF & ALMEIDA AR. 2004. Bacias do Estágio da Transição do Domínio Setentrional da Província Borborema. In: MANTESSO NETO V, BARTORELLI A, CARNEIRO CDR & BRITO NE- VES BB (Ed.). Geologia do Continente Sul-Americano: Evolução da obra de Fernando Flávio Marques de Almeida. Editora Beca, São Paulo, 525-536ROEST, W.R., VERHOEF, J., PILKINGTON, M., Magnetic interpreta- tion using the 3-D analytic signal (1992) Geophysics, 57 (1), pp. 116-125SANTOS, T.J.S., FETTER, A.H., NOGUEIRA, N.J., Compari- sons between the northwestern Borborema Province, NE Brazil, and the southwestern Pharusian Dahomey Belt, SW Central Africa (2008) West Gondwana: Pre-Cenozoic Correlations Across the South Atlantic Region, 294, pp. 101-119. , PANKHURST RJ, TROUW RAJ, BRITO NEVES BB & DE WIT MJ Ed, Geological Society, London, Special PublicationsSILVA, A.M., McCAFFERTY, A.E., PIRES, A.C.B., An Integrated Ex- ploration Approach to Map BIF-Hosted Gold Deposits In the Rio das Velhas Greenstone Belt, Quadrilátero Ferrífero, Brazil (2003) Revista Brasileira de Geociências, 33 (2). , Supl. 29-36SILVA, L.C., ARMSTRONG, R., PIMENTEL, M.M., SCANDOLARA, J., RAM-, G.G., WILDNER, W., ANGELIM, L.A.A., ROSA, A.L.Z., Reavaliação da evolução geológica em terrenos pré-cambrianos brasileiros com base em novos dados U-Pb SHRIMP, Parte III: Províncias Borborema, Man- tiqueira Meridional e Rio Negro-Juruena (2002) Revista Brasileira de Geo- ciências, 32, pp. 529-544TEIXEIRA MLA. 2005. Integração de Dados aerogeofí sicos, Geológicos e Isotópicos do Limite Norte do Complexo Tamboril-Santa Quitéria-CE, Província Borborema. Inst. de Geociências, Universidade de Brasilia, Brasilia, Dissertação de Mestrado, 86 pTROMPETTE, R., (1994) Geology of western Gondwana, Pan-African/Brasi- liano Aggregation of South America and Africa, , A.A. Balkema, Rotterdam, Brookfield, 350
Physicochemical properties and antioxidant capacity of propolis of stingless bees (Meliponinae) and Apisfrom two regions of Tocantins, Brazil
Comparisons Between The Northwestern Borborema Province, Ne Brazil, And The Southwestern Pharusian Dahomey Belt, Sw Central Africa
Geological and geochronological data for the northwestern part of the Brasiliano Borborema Province are described and compared with their counterparts in the Pan-African Dahomey (Pharusian) belt that flanks the southeastern margin of the West African Craton, where outcrops are sufficiently continuous to discern the nature of the collision during West Gondwana assembly. In the Médio Coreaú domain, NW Borborema Province, U-Pb and Sm-Nd data have revealed unusual basement rocks representing 2.35-2.30 Ga juvenile crust, along with large tracts of 2.15 -2.10 Ga juvenile gneisses in the Ceará Central domain. These basement blocks were affected by two pulses of intracratonic extension at 1785 and 775 Ma. Prior to West Gondwana collision, a continental arc (the Santa Quitéria batholith) developed between 665 Ma and 620 Ma. The presence of this arc strengthens the hypothesis that convergence between the Borborema Province and the São Luis craton involved closure of an oceanic basin. New geochronological data are presented showing that Palaeoproterozoic orthogneisses (U-Pb upper intercept 2288 ± 2 Ma) were affected by a major late Neoproterozoic event (554 ± 4 Ma U-Pb lower intercept, 558 ± 3 Ma Sm-Nd whole-rock and mineral isochron). Exhumation and cooling of granulite rocks between 568 and 550 Ma in the Médio Coreaú domain and between c. 587 and 576 in the West African Dahomey Belt indicate that the final tectonic phase was not simultaneous along this front of the orogen. © The Geological Society of London 2008.294101119ACEF, K., LIÉGEOIS, J.P., OUABADI, A., LATOUCHE, L., The Anfeg post-collisional Pan-African high-K calc-alkaline batholith (Hoggar, Algeria), emplaced within the LATEA metacraton (2003) Journal of African Earth Sciences, 37, pp. 295-311AFFATON, P., RAHAMAN, M.A., TROMPETTE, R., SOUGY, J., The Dahomeyide orogen: Tectonothermal evolution and relationship with the Volta basin (1991) The West African orogens and circum-Atlantic correlatives, pp. 95-111. , DALLMEYER, R. D. & LECORCHE, J. P, eds, Springer, New YorkAGBOSSOUMONDÉ, Y., MENOT, R.-P., GUILLOT, S., Metamorphic evolution of Neoproterozoic eclogite from south Togo (West Africa) (2001) Journal of African Earth Sciences, 33, pp. 227-244AGBOSSOUMONDÉ, Y., GUILLOT, S., MENOT, R., Pan-African subduction - collision event evidenced by high-P coronas in metanorites from the Agou massif (southern Togo) (2004) Precambrian Research, 135, pp. 1-21ALMEIDA, F.F.M., BLACK, R., Geological comparison of northeastern South America and Western Africa (1968) Anais de Academia Brasileira de Ciências, 40, pp. 317-319ARTHAUD, M.H., CABY, R., FUCK, R.A., DANTAS, E.L., PARENTE, C.V., Geology of the northern Borborema. Province, NE Brazil and its correlation with Nigeria, NW Africa (2008) West Gondwana: Pre-Cenozoic Correlations Across the South Atlantic Region, 294, pp. 49-67. , PANKHURST, R. J, TROUW, R. A. J, BRITO NEVES, B. B. & DE WIT, M. J, eds, Geological Society, London, Special PublicationsATTOH, K., MORGAN, J., Geochemistry of high-pressure granulites from the Pan-African Dahomeyide orogen, West Africa: Constraints on the origin and composition of the lower crust (2004) Journal of African Earth Sciences, 39, pp. 201-208ATTOH, K., HAWKINS, D., BOWRING, S., ALLEN, B., U - Pb zircon ages of gneisses from the Pan-African Dahomeyide orogen, West Africa (1991) EOS Transactions of the American Geophysical Union, 72, p. 299ATTOH, K., DALLMEYER, R.D., AFFATON, P., Chronology of nappe assembly in the Pan-African Dahomeyide orogen, West Africa: Evidence from 40Ar-39Ar mineral ages (1997) Precambrian Research, 82, pp. 153-171AZZOUNI-SEKKAL, A., BOISSONNAS, J., Une province magmatïque de transition du calco-alcalin à l'alcalin: Les granitïdes Pan-africains à structure annulaire de la chaîne pharusienne du Hoggar (Algérie). 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Neoproterozoic Tectonic And Magmatic Episodes In The Nw Sector Of Borborema Province, Ne Brazil, During Assembly Of Western Gondwana
The Médio Coreaú domain of NE Brazil is located along the northwest margin of Borborema Province, the western branch of a Brasiliano/Pan-African collisional belt that formed during the assembly of Western Gondwana. The early Paleoproterozoic basement of the Médio Coreaú domain is composed of migmatitic gneisses and juvenile granulites, overlain by late Paleoproterozoic and Neoproterozoic rocks intruded by syn- to post-tectonic Brasiliano granitoids. According to integrated structural and geochronological data (U-Pb zircon and monazite ages), the Neoproterozoic tectonic evolution of the Médio Coreaú is characterized by low-angle thrusting and transcurrent deformation. U-Pb geochronological data from plutons intruded during this compressional regime indicate the collisional evolution began at approximately 622 Ma and continued until about 591 Ma. The continuation of convergence until approximately 560 Ma resulted in the formation of NE-SW and E-W shear zones within the Borborema Province and adjoining West African provinces. The final stage of the ductile tectonism was characterized by uplift and high-angle fault generation between approximately 560 and 545 Ma. The last tectonic event was an extensional phase, resulting in the formation of the Jaibaras graben and intrusion of post-orogenic granites at around 532 Ma. © 2007 Elsevier Ltd. All rights reserved.253271284Almeida, F.F.M., Hasui, Y., Brito Neves, B.B., Fuck, R.A., Brazilian structural provinces: an introduction (1981) Earth Science Reviews, 17, pp. 1-29Boher, M., Abouchami, W., Michard, A., Albarede, F., Arndt, N.T., Crustal Growth in West Africa at 2.1 Ga (1992) Journal Geophysics Research, 97, pp. 345-369Brito Neves, B.B., 1975. Regionalização geotectônica do pré-Cambriano nordestino. Thesis, Universidade de São Paulo, p. 198Brito Neves, B.B., 1983. 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U-pb Age Of The Coesite-bearing Eclogite From Nw Borborema Province, Ne Brazil: Implications For Western Gondwana Assembly
The Late Neoproterozoic assembly of western Gondwana played an important role in the subduction of oceanic and continental lithospheres. Such event was also a source of arc magmatism, reworking of cratonic margins and development of ultra-high pressure (UHP) suture zones. In the Borborema province, NE Brazil, we have described for the first time UHP rocks enclosed within gneiss migmatite and calc-silicate rocks. They bear coesite included in atoll-type garnet from metamafic rocks, identified by petrographic study and Raman microspectroscopy analysis. U-Pb zircon dating of the leucosome of the migmatites and the calc-silicate rock displays, concordant ages of 639. ±. 10. Ma and 649.7. ±. 5. Ma, respectively, here interpreted as the minimum age of the eclogitization event in the region. U-Pb zircon dating of the coesite-bearing rock defined a concordia age of 614. 9. ±. 7.9. Ma that comprised the retrograde eclogitic conditions to amphibolite facies. The UHP rocks, mostly retrograded to garnet amphibolites, occur enclosed in the Paleoproterozoic continental block composed of calc-silicate rocks, migmatized sillimanite gneiss, mylonitic augen gneiss and granitic and tonalitic gneiss along a narrow N-S oriented belt between the Santa Quite´ria magmatic arc and the Transbrasiliano lineament. This block was involved in the subduction to UHP eclogite depths, and was retrogressed to amphibolite during its exhumation and thrusting. Our data indicate an important Neoproterozoic transcontinental suture zone connecting the Pharusian belt with Borborema Province, and probably with the Brasi´lia belt in central Brazil
Structural And Geochronological Studies Of The Médio Coreaú Domain, Ne Brazil: Constraints On Brasiliano/pan-african Tectonic Evolution In The Nw Part Of The Borborema Province
Recent structural investigations and geochronological studies of rocks from the Médio Coreaú domain in the NW part of northeast Brazil's Borborema Province provide important constraints on the tectonic evolution of the region both preceeding and during the assembly of West Gondwana. Field observations of structural features and fabrics have revealed the presence of four distinct deformational phases in the MCD: D1, D2, D3 and D4. Only the early Paleoproterozoic gneisses record the D1 tectonic event and its preservation is cryptic owing to strong overprinting by the subsequent tectonic phases. The D2, D3 and D4 events affected younger supracrustal rocks and Neoproterzoic magmatic units, and U-Pb geochronological constraints show that all of these tectonic phases represent deformational events that occurred during Brasiliano collision between the West African craton and the NW part of the Borborema Province. The D2 phase, lasting between ca. 622 and 591 Ma, represents a frontal collision stage, which generated NW verging thrust-nappe systems, low-angle foliation, high-grade metamorphism and crustal anatexis. Transition to a strike-slip regime (D3) occurred at around 591 Ma when the region entered a phase of escape tectonics. During this time, the motion of crustal blocks towards NE and E was accommodated along numerous anastomosing shear zones. Syntectonic emplacement of granitoid plutons took place in transtensional domains of the shear zone system. The intrusion of late tectonic granitoids and rapid uplift and cooling of the orogen around 560 Ma as a result of D4 transpressional movements marked the end of the D3 transcurrent regime. These findings show that only the early Paleoproterozoic gneisses in the Médio Coreaú domain are polycyclic in nature. 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Mesoarchean (3.0 And 2.86 Ga) Host Rocks Of The Iron Oxide-cu-au Bacaba Deposit, Carajás Mineral Province: U-pb Geochronology And Metallogenetic Implications
The Bacaba iron oxide-copper-gold deposit, situated within a WNW-ESE-striking shear zone in the Carajás Domain, Carajás Mineral Province, is hosted by the Serra Dourada Granite, the Bacaba Tonalite, and crosscutting gabbro intrusions, which were intensely affected by sodic (albite-scapolite), potassic, chloritic, and hydrolytic hydrothermal alteration. This deposit is located 7 km northeast of the world-class Sossego iron oxide-copper-gold deposit and might represent a distal and deeper portion of the same or related hydrothermal system. The U-Pb laser ablation inductively coupled plasma-mass spectrometry data for zircon from a sodically altered sample of the Serra Dourada Granite yielded a 2,860±22 Ma (MSWD=11. 5) age. Three samples from the Bacaba Tonalite, including one with potassic alteration and two with Cu-Au mineralization, rendered the 3,001. 2±3. 6 Ma (MSWD=1. 8), 2,990. 9±5. 8 Ma (MSWD=1. 9), and 3,004. 6±9 Ma (MSWD=2. 2) ages, respectively. The ca. 2. 86 and ca. 3. 0 Ga ages are interpreted as the timing of the igneous crystallization of the Serra Dourada Granite and the Bacaba Tonalite, respectively, and represent the oldest magmatic events recognized in the Carajás Domain. The Serra Dourada Granite and the Bacaba Tonalite are interpreted to greatly predate the genesis of the Bacaba deposit. A genetic link is improbable in the light of the similarities with the Sossego deposit, which is also hosted by younger ca. 2. 76 Ga metavolcano-sedimentary units of the Itacaiúnas Supergroup. In this context, the iron oxide-copper-gold deposits in the southern sector of the Carajás Domain could be mainly controlled by important crustal discontinuities, such as a regional shear zone, rather than be associated with a particular rock type. 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