Abstract
The evolution of sediment source regions in the Andes of Ecuador can be linked to Late Cretaceous-Cenozoic development of a subduction-related magmatic arc, retroarc fold-thrust belt, and flexural foreland basin. Andean shortening and crustal thickening in the Eastern Cordillera and Subandean Zone generated not only topographic loading sufficient for flexural subsidence but also surface uplift of diagnostic sources that supplied sediment eastward to the Oriente foreland basin. An assessment of the chronostratigraphic, provenance, and depositional characteristics of a ~4.5-km-thick clastic succession in the Subandean and Oriente foreland basin provides insights into important Cretaceous and Cenozoic shifts in the paleogeographic framework and tectonic evolution of the Ecuadorian Andes.
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