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The forearc of Central Chile (33°–34°S) is formed by three N-S–trending morphostructural units, including, from west to east, the Coastal Cordillera, the Central Depression, and the Principal Cordillera. The Cenozoic sedimentary rocks that could represent the erosional material generated throughout the morphotectonic evolution of these units accumulated in the marine Navidad Basin. The age of the marine deposits is controversial, as foraminifer biostratigraphy indicates that marine deposition started during the late Miocene, whereas 87Sr/86Sr data indicate that deposition started during the early Miocene. We carried out single heavy mineral microprobe analysis and standard heavy mineral analysis of...

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