Pre-Cenozoic intra-plate magmatism along the Central Andes (17–34°S): Composition of the mantle at an active margin

The Early Palaeozoic high-grade metamorphism at the active continental margin of West Gondwana in the Andes (NW Argentina/N Chile)

“…Contemporaneously, small-volume intra-plate magmatism of mafic to ultramafic composition occurred in the back arc (e.g. Sempere et al 2002;Lucassen et al 2007;Comin-Chiaramonti et al 2010). This magmatism contributed to the compositional variability of magmatic rocks at this margin without a fundamental change of the overall composition of the crust .…”

Mesozoic Iron Oxide Copper-Gold Mineralization in the Central Andes and the Gondwana Supercontinent Breakup

“…2B; Renne et al, 1996). At this time, only weak tectonic movement from the Phoenix plate occurred (Jaillard et al, 2000) and the tectonic regime in the Central Andes was dominated by transtension associated with the Paraná eruption and related Atlantic extension (Lucassen et al, 2007). Magmatism at this stage was relatively dormant (Jaillard et al, 2000), while hydrothermal alteration was localized at Marcona-Mina Justa district (Chen et al, 2010a).…”

An overview of the Mesozoic-Cenozoic magmatism and tectonics in Eastern Paraguay and central Andes (Western Gondwana): Implications for the composition of mantle sources

“…MORB, DMM, HIMU, and EMI components after Hart (1988) and Zindler and Hart (1986). Filled star is the average composition of 41 basanitic lavas from Central Andes (Lucassen et al, 2002(Lucassen et al, , 2007; open star is the average compositions of 67 basanitic lavas from Paraguay (Petrini et al, 1994;Marques et al, 1999a , 1997) and Th (PAN tholeiitic basalts; Piccirillo and Melfi, 1988). It should be noted that the compositions of metasomatized rocks formed from a single metasomatizing melt vary with the evolution of the melt.…”

“…It should be noted that the compositions of metasomatized rocks formed from a single metasomatizing melt vary with the evolution of the melt. Consequently, the veins will define a trend of shallow slope, and the mixing curves between In particular, the studies carried out on mantle lherzolites and mantle-derived peridotites (Schultz et al, 2004;Lucassen et al, 2005Lucassen et al, , 2007Comin-Chiaramonti et al, 1991, 1997Antonini et al, 2005) have highlighted the heterogeneity of the lithospheric mantle in both regions. The differences among the wellknown HIMU, EMI and EMII mantle end-members (Zindler and Hart, 1986;Hannan and Graham, 1996;Hofmann, 1997;Jackson and Dasgupta, 2008;Niu et al, 2012) are linked to differences in their radioactive parent/daughter ratios (Rb/Sr, Sm/Nd, Lu/Hf, U/Pb and Th/Pb) with respect to their "pristine OIB" source.…”