First-Order Stratigraphic Boundaries of the Late Cretaceous–Paleogene Retroarc Foreland Basin in Colombia
نویسندگان
چکیده
The present-day Magdalena Valley, Eastern Cordillera, and Llanos Basin were part of a regional multiphase basin that started as an extensional in the Jurassic. Then, it was transformed into retroarc foreland Late Cretaceous subsequently separated hinterland during late Eocene. We incorporated new data from Cordillera chronostratigraphically correlated with adjacent basins. Their correlation contributed to establishing stratigraphic boundaries formed first-order changes marked beginning end lifespan basin. In initial stage, lateral extent along dip significant depocenter extended Valley westernmost approximately 300–470 km. At same time, western flank most uplifting. contact between retrograding marine facies Upper Lidita, Buscavidas, Umir, Guadalupe, Palmichal units marks Campanian maximum regressive surface exhumation orogen, Central Cordillera. Therefore, represents surface. This does not extend across whole uplifting areas, subaerial unconformities truncate middle rocks. combination lower boundary sequence, their diachroneity is product northward migration orogen. Teruel, Hoyon, Bogota, Cacho, Socha, Barco, Cuervos formations are truncated by unconformity. It orogenic unloading termination As another change, upper sequence.
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ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2022
ISSN: ['2296-6463']
DOI: https://doi.org/10.3389/feart.2022.876140