Lithospheric versus asthenospheric source of the SW Amazonian craton A-types granites: the role of the Paleo- and Mesoproterozoic accretionary belts for their coeval continental suites

摘要

The tectonic setting and source of the Paleo- and Mesoproterozoic magmatic suites in the SW Amazonian craton revealed by integrated isotopic and geochemical data allow correlation between the accretionary mobile belts and the contemporary continental magmatism (e.g. rapakivi complexes) within the foreland. The continental magmatism may represent the synorogenic response to high heat flow in the asthenosphere resulting from oceanic crust subduction, which led to the development of the successive Proterozoic magmatic arcs.