Look! No volcanic arc hiatus in the middle of the period some people want no subduction under South America! Read the linked paper and see how their geochemistry is most consistent with a subduction related origin. www.researchgate.net/publication/...

Geophysicists/Geodynamicists: Quit only citing shit from 30 years ago when field mapping of Chile hadn't even been finished yet to support your pet geodynamic hypotheses!