TY - JOUR AU - Tettamanti , Camila AU - Moyano Paz, Damián AU - Varela, Augusto Nicolás AU - Tineo, David Eric AU - Gómez-Peral, Lucía Elena AU - Poiré, Daniel Gustavo AU - Cereceda , Abril AU - Odino Barreto, Andrea Lorena PY - 2021/03/31 Y2 - 2024/03/29 TI - Sedimentology and fluvial styles of the uppermost Cretaceous continental deposits of the Austral-Magallanes Basin, Patagonia, Argentina JF - Latin American Journal of Sedimentology and Basin Analysis JA - Lajsba VL - 25 IS - 2 SE - DO - UR - https://lajsba.sedimentologia.org.ar/index.php/lajsba/article/view/66 SP - 149-168 AB - <p>The sedimentary infill of the Austral-Magallanes Basin since the onset of its fore­land stage in the Lago Argentino region is dominated by deep-marine and coastal deposits. However, during the Late Cretaceous the basin accumulated a thick and poorly known continental sedimentary succession, which has received different lithostratigraphic names. The aim of this work is to characterize the here defined Uppermost Cretaceous Continental Deposits (UCCD) from a detailed facies and architectural analysis, as well as the resulting stacking pattern. Seven Facies As­sociations (FAs) were discriminated in order to define the sedimentary paleoenvi­ronments: FA1, gravelly sheet bodies; FA2, tabular bodies of conglomerates with mud rip-up clasts; FA3, complex tabular sandy bodies; FA4, simple tabular sandy bodies; FA5, tabular bodies of structureless sandstones; FA6, heterolithic depos­its; and FA7, fine-grained deposits. Three different fluvial styles were recognized: meandering systems dominated by avulsion and meander abandonment processes (fluvial style a), braided systems (fluvial style b), and meandering systems domi­nated by overbank flood processes (fluvial style c). The stacking pattern of the FAs allowed to divide the UCCD into two major depositional stages related to the accommodation space vs sediment supply (A/S) ratio. Stage I is characterized by the alternation of fluvial styles a and b, while the Stage II is represented by the alternation of fluvial styles c and b, and the Stage III is characterized entirely by fluvial style c deposits. Although the UCCD are considered as a whole within a framework of low A/S ratio, several high frequency variations were recognized. The Stage I records seven high frequency intervals of which four are characterized by high A/S ratio interrupted by three events of low A/S. While the stage II is repre­sented by six high frequency periods of low A/S ratio and other five high frequency events of high A/S ratio. The Stage II is considered as deposited in a relative higher A/S context in comparison with the Stage I, based on the behavior of the moder­ate to high sinuosity meander fluvial systems. Finally, the Stage III is represented entirely by a high frequency low A/S ratio event.</p> ER -