Abstract
Foreland basins developed along the eastern Andean margin as a response to the interaction of the subducting Nazca plate and the South American Craton. These basins contain sediments that were eroded from the cratons as well as the rising Cordilleras. Because information cannot be accurately traced within the orogens, an advanced thermochronological methodology based on changes in lagtime upwards in the stratigraphic column, combined with heavy mineral analysis, allowed events in the source regions to be distinguished. A detrital zircon fission track study of sediments from the Andean Foreland Basin in Ecuador, reveals in detail the distinct tectonic phases that affected the source regions- they are 140-125 Ma, 90 - 85 Ma, 55 - 52 Ma, 37 - 33 Ma and possibly 48 - 46 Ma.
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