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Geochemical data of sedimentary basins have been used to determine their plate tectonic setting. Here we test geochemical data for paired psammite–pelite samples from two greywacke packages that underlie 60% of the Paleozoic Acatlán Complex of southern Mexico: one an Ordovician rift-passive margin suite and the other a Carboniferous active margin suite. Both units consist of low-grade, polydeformed...
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