bjg.siteoficial.wsbjg.siteoficial.ws/1986/n2/gibbs.pdf · Rb-Sr de rocha total de 2.687 ± 54 Ma,...

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Transcript of bjg.siteoficial.wsbjg.siteoficial.ws/1986/n2/gibbs.pdf · Rb-Sr de rocha total de 2.687 ± 54 Ma,...