Geochemistry and age of mafic rocks from the Votuverava Group, southern Ribeira Belt, Brazil: Evidence for 1490Ma oceanic back-arc magmatism
This paper presents new SHRIMP U-Pb zircon and 40Ar-39Ar hornblende ages as well as elemental and Sr-Nd isotopic data for greenschist to amphibolite facies meta-mafic rocks from the Votuverava Group (Ribeira Belt, Brazil). These mafic rocks appear to be mostly subvolcanic and volcanic rocks and, in part, intrusions coeval with the host sedimentary succession. Magmatic zircons have a U-Pb age of 1488±4Ma. An 40Ar-39Ar hornblende age of 1390±20Ma suggests cooling after a thermal event. The mafic...[Show more]
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