Decifrando a geoquímica de duas sequências siliciclásticas paleoproterozóicas chave da Piedra Alta Terrane (Cráton Río de la Plata, Uruguai)
DOI:
https://doi.org/10.31285/AGRO.26.525Palavras-chave:
geoquímica, proveniencia, Ojosmín, Cerro Figurita, paleoproterozoicoResumo
A geoquímica de duas sequências metavulcano-sedimentares depositadas no terreno Piedra Alta é comparada e a evolução geotectônica é discutida. A Unidade Ojosmín (OU) é composta por MORB como rochas básicas no fundo e sequência siliciclástica de granulação fina interpretada como turbiditos marinhos em direção ao topo e posteriormente obduzidos durante o Orosirian. Toda a geoquímica das rochas metassedimentares OU mostra a ausência da alteração da rocha geradora por intemperismo (Indice de Alteração Química, CIA, 40-53) durante a deposição, indicando as condições climáticas da Ice-house e correlacionadas com as glaciações Rhyacian em todo o mundo. A reciclagem do zircão fraciona as terras raras (REE) aumentando a quantidade de HREE, Y e Hf. A variação de Th/Sc (0.4-4.9), Zr/Sc (30-410), Th/U (2.5-4.3) e a anomalia Eu/Eu* (0,4-0,7) são semelhantes à Crosta Continental Superior (UCC). Uma nova unidade metassedimentar clástica dobrada em amplo sinclinal, chamada Formação Cerro de la Figurita (CFFm.) é definida. O CFFm. sedimentação clástica (3.000 m de espessura) representa uma sequência ascendente de aprofundamento de conglomerados polimíticos depositados em um ambiente dominado por fendas aluviais que evoluem para condições marinhas, dominadas por turbiditos e provavelmente relacionadas a um cenário geotectónico de antepais desenvolvido durante o Orosiriano. A geoquímica da CFFm. mostra um comportamento semelhante com a UCC não reciclada, aumentando o intemperismo da rocha fonte para o topo (CIA 45-92). A contribuição de uma fonte de rochas máficas (provavelmente ofiolítica) é revelada pelas baixas razões de Th/Sc (0.3-1.5), Zr/Sc (6-20), Th/U (3-6), Cr/V alto (1,1 -12,2) e a anomalia negativa Eu/Eu * de algumas amostras (0,5-0,9).
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