Evolution of Neoproterozoic ophiolites from the southern Brasiliano Orogen revealed by zircon U-Pb-Hf isotopes and geochemistry
作者: Karine R. ArenaLéo A. HartmannCristiano Lana
作者单位: 1Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, 91501-970 Porto Alegre, Rio Grande do Sul, Brazil
2Departamento de Geologia, Escola de Minas, Universidade Federal de Ouro Preto, Morro do Cruzeiro, 35400-000 Ouro Preto, Minas Gerais, Brazil
刊名: Precambrian Research, 2016, Vol.285 , pp.299-314
来源数据库: Elsevier Journal
DOI: 10.1016/j.precamres.2016.09.014
关键词: ZirconAlbititeU-Pb-Hf isotopesOphioliteSão Gabriel terraneBrasiliano Orogen
英文摘要: Abstract(#br)U-Pb and Lu-Hf isotopic analyses of zircon from albitites, southern Brasiliano Orogen, indicate Neoproterozoic ages for two ophiolites. The difficulty of dating ophiolites is overcome by finding zircon in albitites contained in serpentinite. Two key areas were selected for the study, the Cerro Mantiqueiras and the Ibaré ophiolites, both in the juvenile São Gabriel terrane, Rio Grande do Sul, Brazil. Two distinct U-Pb SHRIMP ages are registered in the Cerro Mantiqueiras ophiolite zircons, respectively 923±3Ma in the cores and 786±13Ma in the rims. In the Ibaré ophiolite, the dating of zircon grains resulted in a single age of 892±...
全文获取路径: Elsevier  (合作)
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影响因子:4.441 (2012)

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