Sedimentology and Stratigraphic Evolution of the Early Cretaceous Regressive Cycle at the Northern Edge of the Austral Basin, Santa Cruz, Argentina DOI
Mauro Nicolás Valle, José Matildo Paredes, Nicolás Foix

et al.

Published: Jan. 1, 2023

The northern edge of the Austral Basin in southern Patagonia (Argentina) preserves a 200-300 m thick regressive section Barremian-Aptian age. conformably stratigraphic sequence consists outer-shelf deposits Río Mayer Formation, evolving to shallowing-upward, mixed-energy deltaic sequences Belgrano covered by fluvial Tarde Formation. Their sedimentary evolution was evaluated analyzing facies, paleocurrents, stacking patterns, and paleohydrological study succession five areas along north-south transect. Twenty lithofacies were identified, grouped into six facies associations: (I) prodelta, (II) delta front, (III) plain, (IV) channels, (V) proximal floodplain, (VI) distal floodplain deposits. progradation depositional systems occurred from north south, exhibiting notable temporospatial changes processes characteristics its feeder rivers. A funnel-shaped marine physiography controls relative influence tidal storm formations, whereas river-dominated nature is associated with evidencing significant discharge variations semiarid climate. In addition, Fm. shows spatial styles southward reduction i) channel sizes, ii) water discharge, iii) density, allowing for interpretation distributive system. Our results indicate that Lower Cretaceous units controlled inherited topography previous extensional settings, no evidence coeval tectonic activity during their deposition. Furthermore, completeness components, lack large erosional surfaces, negligible seaward shift suggest base level drops. To date, climatic only manifested considerable variation river coastal environment, but further studies should reinforce importance organization systems.

Language: Английский

Deciphering influencing processes in a tropical delta system (middle-late Eocene? to Early Miocene, Colombian Caribbean): Signals from a well-core integrative sedimentological, ichnological, and micropaleontological analysis DOI Creative Commons
Sergio A. Celis, Francisco J. Rodrı́guez-Tovar, Andrés Pardo‐Trujillo

et al.

Journal of South American Earth Sciences, Journal Year: 2023, Volume and Issue: 127, P. 104368 - 104368

Published: April 26, 2023

Deltaic depositional systems are characterized by a complex interaction of physical, chemical, and biological factors. Although fluvial-, wave- tidal-dominated deltaic environments have been extensively studied, evaluation the processes in tropical mixed sedimentary has not fully documented. Tropical regions with active margins tectonic where these multiple factors act on development coastal systems. An onshore well-core from this setting (Sinú-San Jacinto Basin, Colombian Caribbean) revealed that middle-upper Eocene?-lower Oligocene coarse-grained is replaced thick coal-bearing mixed-energy fine-grained succession to Early Miocene. The integrated analysis facies associations, ichnological data, terrestrial/marine micropaleontological assemblages (palynomorphs, foraminifera, calcareous nannofossils) allowed us identify changes dominance influence (fluvial-, tide) shoreline evolution. Using information, as well sediment supply accommodation space ratio, we were able distinguish three intervals bottom top siliciclastic succession: (i) middle-late Eocene?–early Oligocene, prograding, fluvial-dominated, tide-influenced deltas amalgamation hyperpycnal-dominated mouth bars hyperconcentrated flow input, (ii) retrograding heterolithic delta deposits punctuated transgressive pulses, (iii) late Miocene, aggradational, plain higher proportion phases over continental environment. complete represents long-term (∼14 Myr) nearshore systems, showing different lithological arrangements sedimentation styles. A evolution observed Eocene? steep, short system humid lowland forest punctual macrobenthic tracemaker communities (Interval I) an Miocene gently (poorly drained), well-developed mangroves storm-influence record through trace fossils III). combination factors, including subsidence, relief uplifting, possible relative sea level changes, interpreted main controls stratigraphic styles throughout entire succession. Minor-order successions into each interval (e.g., prograding distributary mouth-bar channel) short-term cycles presumably controlled internal dynamic. Multidisciplinary essential for recognizing fluvial, wave, tidal deltas, high spatial temporal variability makes it difficult determine dominant long periods time.

Language: Английский

Citations

13
Documenting a coastal sediment routing tract in the sedimentary record: Implications for coastal palaeogeography and sand distribution patterns DOI Open Access
Manuel F. Isla, Ernesto Schwarz, Luca Caracciolo

et al.

Sedimentology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 9, 2025

ABSTRACT Coastal sediment transport, primarily driven by littoral drift, is a well‐understood process occurring in many wave‐dominated modern coasts. This transport can extend over hundreds of kilometres, linking river mouths to sand barriers and coastal dunes. Recognizing the importance coast‐parallel processes dispersing significant volumes, both source‐to‐sink sediment‐routing‐system concepts emphasize need include these comprehensive studies. These lead volume changes provenance mixing within specific budgets should consider sediments near coast on shelf as temporary repositories before their final transit into deep‐water sinks. Despite established methodologies for studying routing systems, integration approaches with geological record limited. To address this gap, article introduces Sediment Routing Tract segment any System. The consists three elements: supplier(s), storage(s) drift processes. study presents conceptual framework Tracts, documents an ancient deltaic shoreface sandstones Hauterivian Pilmatué Member (Neuquén Basin, Argentina) evaluates how characterizing single refine palaeogeographical reconstructions. Understanding aspects crucial improving mass balance calculations analyses systems.

Language: Английский

Citations

0
Palynofloras from the Maastrichtian Chorrillo Formation (Patagonia, Argentina): Paleoenvironmental and paleoclimatic implications DOI
Valeria S. Pérez Loinaze, Ezequiel I. Vera, M. Sol Raigemborn

et al.

Palaeogeography Palaeoclimatology Palaeoecology, Journal Year: 2025, Volume and Issue: unknown, P. 112764 - 112764

Published: Jan. 1, 2025

Language: Английский

Citations

0
Maastrichtian climate of southern Patagonia (Argentina): an approach from paleosols of the dinosaur-bearing Chorrillo Formation DOI
M. Sol Raigemborn, Sabrina Lizzoli, Damián Moyano‐Paz

et al.

Cretaceous Research, Journal Year: 2025, Volume and Issue: unknown, P. 106144 - 106144

Published: April 1, 2025

Language: Английский

Citations

0
Paleosols of the Maastrichtian dinosaur-bearing Chorrillo Formation (southern Patagonia, Argentina): Paleoenvironmental and paleoclimate implications DOI
M. Sol Raigemborn, Sabrina Lizzoli, Damián Moyano‐Paz

et al.

Cretaceous Research, Journal Year: 2023, Volume and Issue: 150, P. 105587 - 105587

Published: May 22, 2023

Language: Английский

Citations

9
Dominance of Phycosiphon incertum vs Zoophycos in shelf environment: example from the transgressive Palermo Aike black shale deposits of the Austral-Magallanes Basin, Argentina DOI
Mariano Arregui,

Isabel Eugenia Giannoni,

Augusto N. Varela

et al.

Marine and Petroleum Geology, Journal Year: 2023, Volume and Issue: 155, P. 106384 - 106384

Published: June 26, 2023

Language: Английский

Citations

4
Sedimentological and ichnological characterization of delta front mouth bars in a river‐dominated delta (Upper Cretaceous) from the La Anita Formation, Austral Basin, Argentina DOI Open Access
Juan José Ponce, Noelia B. Carmona,

Damián Jait

et al.

Sedimentology, Journal Year: 2023, Volume and Issue: 71(1), P. 27 - 53

Published: July 21, 2023

Abstract Integrated sedimentological and ichnological studies in deltaic systems are key to determine whether a delta is river‐dominated, tide‐dominated, wave‐dominated or hybrid, thus predict the distribution of their geometries main reservoirs. The Austral Basin one most important oil gas basins from Argentina, Upper Cretaceous La Anita Formation has shown excellent attributes as hydrocarbon reservoir. Analysis eleven cores, supplemented by large volume well logging data two‐dimensional three‐dimensional seismic, allowed recognize river‐dominated system affected hyperpycnal discharges storm events. Four facies associations were recognized (offshore, prodelta, front interdistributary bay), being associations, recurrent constituting major reservoir Formation. Three types mouth bars have been characterized front. Type I corresponds active with preservation sedimentary structures bioturbated suspension deposit feeding organisms. II represents stopped progradation abandonment construction bars, which completely reworked organisms and, some cases, fair‐weather storm‐wave processes at top. III comprises transitional intervals structures, high concentration phytodetritus, paucity bioturbation. amalgamation coalescence these three sandy produce lobe‐like progradation. This proposed model allows explain principal mechanism can be applied analysis other reservoirs where bar architectural elements dominant.

Language: Английский

Citations

4
Fossil vertebrates from the Cerro Fortaleza Formation (Upper Cretaceous), Santa Cruz Province, Argentina DOI
Federico L. Agnolín, Gerardo P. Álvarez-Herrera,

Mauro Aranciaga Rolando

et al.

Cretaceous Research, Journal Year: 2023, Volume and Issue: 154, P. 105735 - 105735

Published: Oct. 17, 2023

Language: Английский

Citations

4
Ichnological indicators of physico-chemical stresses in wave- to tide-dominated Miocene shallow marine environments (argentine Patagonia) DOI Creative Commons
Sergio A. Celis, Damián Moyano‐Paz, Sebastián Richiano

et al.

Sedimentary Geology, Journal Year: 2024, Volume and Issue: unknown, P. 106755 - 106755

Published: Sept. 1, 2024

Language: Английский

Citations

1
River mouth morphodynamics and deflection over the short term: effects on spit growth and mangrove dynamics DOI Creative Commons
Temitope D. Timothy Oyedotun,

Gordon Ansel Nedd

Frontiers in Environmental Science, Journal Year: 2023, Volume and Issue: 11

Published: May 18, 2023

The river mouth shows the influence of dynamics sediment deposition and processes organising deposits. mouths Guyana coast, as with other coastal systems in Guianas, are influenced by mud banks from Amazon River rivers. This study analysed probed riverine marine influences on small morphological developments. In this study, system were carried out satellite images through comparison inter-annual morphodynamics mouths, complemented data hydrodynamic among others. demonstrates that recent advancement availability Synthetic Aperture Radar (SAR), remotely sensed data, allow for classification migrating action processes; effective monitoring mudflats development spit formation; and, exhibition transitioning infilling. Sentinel-1 Mahaica-Mahaicony processed using Google Earth Engine (GEE) ArcGIS to observe its effects deflecting mouth, influencing mangrove dynamics. results analyses show shoal governed feedback various estuarine resulting interactions between ocean. have not only highlighted importance infilling build-up river-mouth deflection but impact ecosystem (mangrove) associated mouth.

Language: Английский

Citations

3