Chilenia was an ancient
microcontinent or
terrane whose history affected many of the older rocks of central
Chile and western
Argentina. It was once separated by
oceanic crust from the
Cuyania terrane to which it accreted at ~420-390 Ma when Cuyania was already amalgamated with
Gondwana.[1]
^[1] Rapalini, A.E. 2005. The accretionary history of southern South America from the latest Proterozoic to the Late Palaeozoic: some palaeomagnetic constraints. From: Vaughan, A. R M., Leat, P. T. &
Pankhurst, R. J, (eds). Terrane Processes at the Margins of Gondwana. Geological Society, London, Special Publications, 246, 305-328.