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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Contribution of SHRIMP U-Pb zircon geochronology to unravelling the evolution of Brazilian Neoproterozoic fold belts

Texto completo
Autor(es):
Stipp Basei, Miguel Angelo [1] ; Brito Neves, Benjamim Bley [2] ; Siga Junior, Oswaldo [3] ; Babinski, Many [4] ; Pimentel, Marcio Martins [5] ; Gaeta Tassinari, Colombo Celso [6] ; Bezerra Hollanda, Maria Helena [7] ; Nutman, Allen [8] ; Cordani, Umberto Giuseppe [9]
Número total de Autores: 9
Afiliação do(s) autor(es):
[1] Univ Sao Paulo. Inst Geociencias
[2] Univ Sao Paulo. Inst Geociencias
[3] Univ Sao Paulo. Inst Geociencias
[4] Univ Sao Paulo. Inst Geociencias
[5] Univ Brasilia. Inst Geociencias
[6] Univ Sao Paulo. Inst Geociencias
[7] Univ Sao Paulo. Inst Geociencias
[8] Univ Wollongong. Sch Earth & Environm Sci
[9] Univ Sao Paulo. Inst Geociencias
Número total de Afiliações: 9
Tipo de documento: Artigo Científico
Fonte: Precambrian Research; v. 183, n. 1, SI, p. 112-144, NOV 1 2010.
Citações Web of Science: 32
Resumo

The South-American continent is constituted of three major geologic-geotectonic entities the homonym platform (consolidated at the end of the Cambrian) the Andean chain (essentially Meso-Cenozoic) and the Patagonian terrains affected by tectonism and magmatism through almost all of the Phanerozoic The platform is constituted by a series of cratonic nuclei (pre-Tonian fragments of the Rodinia fission) surrounded by a complex fabric of Neoproterozoic structural provinces Two major groups of orogenic processes (plate interaction cycles) constitute the evolution of these provinces the older occurred in the Tonian (smaller in area) and the younger Brasiliano that is present in all provinces The Tonian cycles (pre-Rodinia fission?) are still being sorted out and many questions still need to be answered The Brasiliano orogenic collage events (post-Rodinia fission?) developed in three main stages in part coeval from a province to another and are 650-600 580-560 and 540-500 Ma respectively (the late event reaching the Ordovician) The first group of orogenies is recorded in practically all provinces The third group is restricted to part of the Mantiqueira Province (southeast of the platform Buzios Orogeny) and present in the Pampean province (SW of the platform) For all these groups of orogenic events there are considerable records of rock assemblages related to processes of convergent plate interaction opening accretion collision and further extrusion There is a good correlation between the geologic and geotectonic data and geochemical and isotopic data The late tectonic processes (post-orogenic magmatism foreland basins etc) of the first two groups compete in time in distinct spaces with the peak of orogenic processes in the third group The introduction of the SHRIMP U-Pb methodology was fundamental to separate the Tonian and post-Tonian orogenic groups and their respective divisions in time and space Thus there are still many open points/problems which lead to expectations of addressing these issues in the near future with the more Intense use of this methodology (C) 2010 Elsevier B V All rights reserved (AU)

Processo FAPESP: 06/06957-1 - O magmatismo granítico do Cinturão Dom Feliciano, Santa Catarina, e sua importância na amalgamação neoproterozóica do Gondwana Ocidental
Beneficiário:Miguel Angelo Stipp Basei
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 05/58688-1 - A América do Sul no contexto dos supercontinentes: fusão e fissão
Beneficiário:Miguel Angelo Stipp Basei
Linha de fomento: Auxílio à Pesquisa - Temático