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South America in the context of supercontinents: fusion and fission


Without excluding any of the multiple activities of the Center for Geochronologic Research of São Paulo University (Centro de Pesquisas Geocronológicas da Universidade de São Paulo - CPGeo/USP), the thematic project "South America in the context of supercontinents - fusion and fission" aims at encompassing the several branches related to CPGeo/USP activities in a more coherent and useful way, gathering the present and future trends and demands of the Geosciences. Besides seeking financial support to maintain the quality of the CPGeo laboratory routine during the development of the project, it covers the assembly of themes that contemplates the interests and vocation of the group of researchers from CPGeo-USP, focusing not only present objectives but also those programmed for the near future. The continental lithosphere has grown from a non-existent area at 4.5 Ga to the estimated 150 x 106 km2 at present. The way by which this growth has taken place is neither proportional to time nor consensual. The growth is related to heat losses in the Earth's interior and to time, and consequently to irreversible global differentiation processes. A study of the present continents must consider fusion and fission episodes of the supercontinents. In fact, each continent was generated at a certain time by fragmentation of a large precursor continental mass. It is not possible to simply take into account the last shape of a continent; it is necessary to further investigate the precursor (Proterozoic) history. If continent growth just follows Pangea's evolution pattern, it is necessary to say that the lateral growth/accretion of the continental lithosphere was modest both in the Proterozoic (ca. 20%, ~ 30106 km2) and in the Phanerozoic (ca. 10%, ~ 15106 km2), and that the masses generated in the Archean (70% of the total) resulted mostly from reworking in various ways and intensities. Since the beginning of Western Gondwana Correlation studies (Hurley et al 1967) the CPGeo-USP has strongly participate in the Tectonic and Crustal Evolution theories (Cordani et al 2003a) involving the configuration, distribution and processes related to the supercontinents theory, and even in the vanguard with the critical analysis of this theory (Cordani et al 2003b, Kröner & Cordani, 2003). Isotopic Geology is an indispensable tool that the geoscientist cannot do without in order to trace this history. It is a fundamental complement to geologic mapping and geotectonic studies. This thematic project is planned having these issues in mind, and along its various items, it tries to gather the data that will enable us to collectively grow in respect to scientific knowledge. In each sub-project of the general context, other more specific item are included, all of them linked to the main stem. Aiming at reaching the objectives proposed in this thematic project, three main lines of action are considered: I) - Methods: a) Lu and Hf isotopes in zircon applied to rock genesis; b) - Re-Os isotopes in basaltic covers of the Paraná Magmatic Province; 2) - Constitution of the Western Gondwana: a) Borborema Province vs. North-Western Africa, subdivided in two parts; b)- Mantiqueira Province vs. South-Western Africa, subdivided in four parts, and 3) - Accretion of exotic terrains to the Western Gondwana - Precordillera southwestern border and its relation with the Sierras Pampeanas: correlations/links with Laurentia. An issue of extreme importance to this project is the Brazil-Africa correlation and it is worth pointing out that several problems still remain unsolved and just a few have been definitively answered. Several themes are to be investigated and many questions are to be clarified; the solutions depend on new field and laboratory work in both continents. Equally important is the relation between the old terrains and the exotic fragments accreted to the Gondwana southwestern border, as observed in northwestern Argentina. International collaboration (Chile, Argentina, USA, Germany, South Africa, Namibia and Cameroon) and interest to solve the long-lasting problems involved will be ample throughout the various items of this project. Sixteen Brazilian researchers will participate in this project, most of them staff members of CPGeo or IGcIUSP. In addition, 12 international researchers will contribute with their knowledge and laboratory facilities, thus completing the research group and configuring the multidisciplinary quality that the proposed study requires. Several graduate and under-graduate students complete the group responsable for the project development. (AU)

Articles published in Pesquisa FAPESP Magazine about the research grant:
Birth of a Continent 
Nace un continente 
... and South America emerged 
...Y Sudamérica se hizo 
Articles published in Agência FAPESP Newsletter about the research grant:
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Scientific publications (22)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SIGA, JR., OSWALDO; STIPP BASEI, MIGUEL ANGELO; SATO, KEI; PASSARELLI, CLAUDIA REGINA; NUTMAN, ALLEN; MCREATH, IAN; DOS PRAZERES FILHO, HELCIO JOSE. Calymmian (1.50-1.45 Ga) magmatic records in Votuverava and Perau sequences, south-southeastern Brazil: Zircon ages and Nd-Sr isotopic geochemistry. Journal of South American Earth Sciences, v. 32, n. 4, SI, p. 301-308, . (05/58688-1)
BASEI, M. A. S.; CAMPOS NETO, M. C.; CASTRO, N. A.; NUTMAN, A. P.; WEMMER, K.; YAMAMOTO, M. T.; HUECK, M.; OSAKO, L.; SIGA, O.; PASSARELLI, C. R.. Tectonic evolution of the Brusque Group, Dom Feliciano belt, Santa Catarina, Southern Brazil. Journal of South American Earth Sciences, v. 32, n. 4, SI, p. 324-350, . (05/58688-1, 06/06957-1)
VLACH, SILVIO R. F.; SIGA, JR., OSWALDO; HARARA, OSSAMA M. M.; GUALDA, GUILHERME A. R.; BASEI, MIGUEL A. S.; VILALVA, FREDERICO C. J.. Crystallization ages of the A-type magmatism of the Graciosa Province (Southern Brazil): Constraints from zircon U-Pb (ID-TIMS) dating of coeval K-rich gabbro-dioritic rocks. Journal of South American Earth Sciences, v. 32, n. 4, SI, p. 407-415, . (08/00562-0, 05/58688-1)
SIGA, JR., O.; BASEI, M. A. S.; PASSARELLI, C. R.; SATO, K.; CURY, L. F.; MCREATH, I.. Lower and Upper Neoproterozoic magmatic records in Itaiacoca Belt (Parana-Brazil): Zircon ages and lithostratigraphy studies. GONDWANA RESEARCH, v. 15, n. 2, p. 197-208, . (05/58688-1)
FRIMMEL, H. E.; BASEI, M. S.; GAUCHER, C.. Neoproterozoic geodynamic evolution of SW-Gondwana: a southern African perspective. INTERNATIONAL JOURNAL OF EARTH SCIENCES, v. 100, n. 2-3, p. 323-354, . (05/58688-1)
PASSARELLI, C. R.; BASEI, M. A. S.; WEMMER, K.; SIGA, JR., O.; OYHANTCABAL, P.. Major shear zones of southern Brazil and Uruguay: escape tectonics in the eastern border of Rio de La plata and Paranapanema cratons during the Western Gondwana amalgamation. INTERNATIONAL JOURNAL OF EARTH SCIENCES, v. 100, n. 2-3, p. 391-414, . (05/58688-1)
VARELA, RICARDO; BASEI, MIGUEL A. S.; GONZALEZ, PABLO D.; SATO, ANA M.; NAIPAUER, MAXIMILIANO; CAMPOS NETO, MARIO; CINGOLANI, CARLOS A.; MEIRA, VINICIUS T.. Accretion of Grenvillian terranes to the southwestern border of the Rio de la Plata craton, western Argentina. INTERNATIONAL JOURNAL OF EARTH SCIENCES, v. 100, n. 2-3, p. 243-272, . (05/58688-1)
CASTRO, NEIVALDO A.; GANADE DE ARAUJO, CARLOS E.; BASEI, MIGUEL A. S.; OSAKO, LILIANE S.; NUTMAN, ALAN A.; LIU, DUNYI. Ordovician A-type granitoid magmatism on the Ceara Central Domain, Borborema Province, NE-Brazil. Journal of South American Earth Sciences, v. 36, p. 18-31, . (05/58688-1)
GANADE DE ARAUJO, CARLOS E.; WEINBERG, ROBERTO F.; CORDANI, UMBERTO G.. Extruding the Borborema Province (NE-Brazil): a two-stage Neoproterozoic collision process. TERRA NOVA, v. 26, n. 2, p. 157-168, . (12/00071-2, 05/58688-1)
HUECK, MATHIAS; STIPP BASEI, MIGUEL ANGELO; DE CASTRO, NEIVALDO ARAUJO. Origin and evolution of the granitic intrusions in the Brusque Group of the Dom Feliciano Belt, south Brazil: Petrostructural analysis and whole-rock/isotope geochemistry. Journal of South American Earth Sciences, v. 69, p. 131-151, . (05/58688-1, 06/06957-1)
BASEI, M. A. S.; DRUKAS, C. O.; NUTMAN, A. P.; WEMMER, K.; DUNYI, L.; SANTOS, P. R.; PASSARELLI, C. R.; CAMPOS NETO, M. C.; SIGA, JR., O.; OSAKO, L.. The Itajai foreland basin: a tectono-sedimentary record of the Ediacaran period, Southern Brazil. INTERNATIONAL JOURNAL OF EARTH SCIENCES, v. 100, n. 2-3, p. 543-569, . (05/58688-1)
STIPP BASEI, MIGUEL ANGELO; BRITO NEVES, BENJAMIM BLEY; SIGA JUNIOR, OSWALDO; BABINSKI, MANY; PIMENTEL, MARCIO MARTINS; GAETA TASSINARI, COLOMBO CELSO; BEZERRA HOLLANDA, MARIA HELENA; NUTMAN, ALLEN; CORDANI, UMBERTO GIUSEPPE. Contribution of SHRIMP U-Pb zircon geochronology to unravelling the evolution of Brazilian Neoproterozoic fold belts. Precambrian Research, v. 183, n. 1, SI, p. 112-144, . (05/58688-1, 06/06957-1)
GANADE DE ARAUJO, CARLOS E.; CORDANI, UMBERTO G.; BASEI, MIGUEL A. S.; CASTRO, NEIVALDO A.; SATO, KEI; SPROESSER, WALTER M.. U-Pb detrital zircon provenance of metasedimentary rocks from the Ceara Central and Medio Coreau Domains, Borborema Province, NE-Brazil: Tectonic implications for a long-lived Neoproterozoic active continental margin. Precambrian Research, v. 206, p. 36-51, . (05/58688-1)
SIGA, JR., OSWALDO; CURY, LEONARDO FADEL; MCREATH, IAN; DE ALMEIDA LEITE RIBEIRO, LIGIA MARIA; SATO, KEI; STIPP BASEI, MIGUEL ANGELO; PASSARELLI, CLAUDIA REGINA. Geology and geochronology of the Betara region in south-southeastern Brazil: Evidence for possible Statherian (1.80-1.75 Ga) and Calymmian (1.50-1.45 Ga) extension events. GONDWANA RESEARCH, v. 19, n. 1, SI, p. 260-274, . (05/58688-1)
WESTIN, ALICE; CAMPOS NETO, MARIO DA COSTA. Provenance and tectonic setting of the external nappe of the Southern Brasilia Orogen. Journal of South American Earth Sciences, v. 48, p. 220-239, . (05/58688-1, 10/11152-8)
BASEI, MIGUEL A. S.; PEEL, ELENA; SANCHEZ BETTUCCI, LEDA; PRECIOZZI, FERNANDO; NUTMAN, ALLEN P.. The basement of the Punta del Este Terrane (Uruguay): an African Mesoproterozoic fragment at the eastern border of the South American Rio de La Plata craton. INTERNATIONAL JOURNAL OF EARTH SCIENCES, v. 100, n. 2-3, p. 289-304, . (05/58688-1)
CIOFFI, CAUE RODRIGUES; CAMPOS NETO, MARIO DA COSTA; DA ROCHA, BRENDA CHUNG; MORAES, RENATO; HENRIQUE-PINTO, RENATO. Geochemical signatures of metasedimentary rocks of high-pressure granulite facies and their relation with partial melting: Carvalhos Klippe, Southern Brasilia Belt, Brazil. Journal of South American Earth Sciences, v. 40, p. 63-76, . (05/58688-1, 10/11152-8)
SALLET, RICARDO; PRICE, JONATHAN D.; BABINSKI, MARLY; MORITZ, ROBERT; SOUZA, ZORANO S.; CHIARADIA, MASSIMO. Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Serido Belt, Borborema Province, northeastern Brazil. CHEMICAL GEOLOGY, v. 400, p. 122-148, . (05/58688-1)
MARIA SATO, ANA; LLAMBIAS, EDUARDO J.; BASEI, MIGUEL A. S.; CASTRO, CARLOS E.. Three stages in the Late Paleozoic to Triassic magmatism of southwestern Gondwana, and the relationships with the volcanogenic events in coeval basins. Journal of South American Earth Sciences, v. 63, p. 48-69, . (05/58688-1)
FRIMMEL, HARTWIG E.; BASEI, MIGUEL A. S.; CORREA, VINICIUS X.; MBANGULA, NDAWEDAPO. A new lithostratigraphic subdivision and geodynamic model for the Pan-African western Saldania Belt, South Africa. Precambrian Research, v. 231, p. 218-235, . (05/58688-1)

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