“…Whole-rock geochemistry analyses of itabirite and iron ore from the QF were conducted with the aim to better understand the depositional environment of the different quartz-, dolomiteand/or amphibole-itabirite facies (Klein and Ladeira, 2000;Spier et al, 2007), the role and control of the original composition of the host lithology on the formation of high-grade ore (Spier et al, 2003 and chemical and mineralogical processes during ore genesis (Olivo et al, 2001;Pires, 2003;Rosière and Rios, 2004;Lüders et al, 2005;Cabral et al, 2006;Galbiatti et al, 2007;Cabral et al, 2008;Spier et al, 2008;Pereira et al, 2010;Cabral et al, 2012a;Cabral and Rosière, 2013). However, investigations with respect to in-situ iron oxide chemistry using laser ablation ICP-MS (LA-ICP-MS) are scant despite their vastly improved detection limits and spatial resolution.…”