Morphology and Short-Term Changes of the Caleta Valdés Barrier Spit, Argentina

Kokot, Roberto Roque; Monti, Alejandro J.A.; Codignotto, Jorge Osvaldo

doi:10.2112/03-703a.1

Cited by 33 publications

(28 citation statements)

References 2 publications

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“…2b). Arçay Spit can be defined as a typical "compound spit" (Schwartz, 1982;Kokot et al, 2005) formed by successive berm ridges, which are wave-built intertidal-supratidal landforms (Otvos, 2000). The berm ridges of Arçay spit are characterized by a hook-like shape morphology (Galichon, 1985, Fig.…”

Section: Geographical and Geomorphological Settingsmentioning

confidence: 99%

Sand spit rhythmic development: A potential record of wave climate variations? Arçay Spit, western coast of France

et al. 2008

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Section: Geographical and Geomorphological Settingsmentioning

confidence: 99%

Sand spit rhythmic development: A potential record of wave climate variations? Arçay Spit, western coast of France

et al. 2008

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“…Hacia los 6000 aP (7155-6555 cal aP) se habría llegado al punto máximo de aridez (Brook et al 2015). A escala regional, entre aproximadamente 8000 y 4000 aP, se registra un aumento de temperatura a nivel global, una elevación del nivel del mar (Codignotto et al 1992), un fortalecimiento de los westerlies (Gilli et al 2005) En cuanto a la vinculación de las tendencias cronológicas con la información paleoambiental (Figura 5c), la porción final del perfil polínico integrado de la localidad arqueológica de Los Toldos (Prieto et al 2018) sugiere que entre aproximadamente 6000 y 4000 cal aP se reconocen estepas arbustivas con predominio de Asteraceae subf. Asteroideae asociadas con arbustos (Ephedra, Nassauvia), que indicarían condiciones ambientales secas (de Porras et al 2009) que podrían correlacionarse con el hiato de la CID.…”

Section: Discusión Y Conclusionesunclassified

Análisis cronológico de las ocupaciones humanas en la cuenca inferior del río Deseado, Patagonia Argentina

Ambrústolo

2022

Latin Am. antiq.

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Uno de los temas centrales de discusión en la arqueología de Patagonia se enmarca tradicionalmente en torno a la profundidad temporal de las ocupaciones humanas y su relación con el estudio de las estrategias de movilidad de los grupos cazadores-recolectores que habitaron diferentes espacios. A partir de la calibración y la suma de probabilidades de una muestra actualizada de dataciones radiocarbónicas obtenidas para la cuenca inferior del río Deseado, se identifica una secuencia ocupacional discontinua que se desarrolla durante el Holoceno medio y tardío. La información paleoclimática a escala regional y el carácter exploratorio de las ocupaciones humanas sugieren que un hiato cronológico identificado hacia el final del Holoceno medio (4988-3978 cal aP) podría estar vinculado con estrategias de abandono y relocalización del área, en función de dar respuesta a condiciones de aridez que habrían configurado un ambiente con escasa disponibilidad hídrica. Durante el Holoceno tardío final (entre ca. 1500 y 300 cal aP), el registro de espacios costeros ampliamente habitados y la identificación de un marcado crecimiento de la densidad de probabilidad de la curva de distribución de dataciones sugieren una trayectoria hacia un aumento poblacional en el marco de estrategias de movilidad asociadas al litoral atlántico.

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“…Tidal range decreases southward from Puerto Madryn (mean spring and neap ranges ca 5 m and ca 3 m, respectively) to the mesotidal Río Chubut mouth (mean spring and neap ranges 3.8 m and 2.3 m), where mean annual wave height is ≤1 m and the highest breakers are observed in winter. Prevailing waves are from the north‐east and longshore drift is predominantly southward from the Peninsula Valdés to the Río Chubut mouth (Kokot et al ., 2005; Isla, 2017). The Patagonia coast farther south, characterized by pebbly beaches largely fed from erosion of sea cliffs, is tectonically and isostatically active with uplift rates up to 1.5 mm/year (Codignotto et al ., 1992; Pedoja et al ., 2011; Isla & Cortizo, 2014).…”

Section: The Argentine Passive Marginmentioning

confidence: 99%

From Patagonia to Río de la Plata: Multistep long‐distance littoral transport of Andean volcaniclastic sand along the Argentine passive margin

et al. 2021

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Large sediment masses are transferred over many hundreds of kilometres along the coast of passive continental margins worldwide. The relevance of such a phenomenon for source-to-sink studies, environmental issues, and coastal management remains largely unperceived. This study traces the paths of volcaniclastic sand along ca 2170 km of the Argentine coast and documents a 760 km long cell of littoral transport extending from the formerly larger R ıo Colorado delta to the edge of the R ıo de la Plata mouth. During deglaciation stages and humid periods of the Pleistocene, a much greater sediment volume than today was transferred by the Desaguadero and Colorado rivers from the highest-relief tract of the Andean Cordillera to the Atlantic Ocean. Amphibole-rich sand originally supplied by the R ıo Desaguadero is being recycled today from Pampean lowlands to feed the beaches along R ıo de la Plata southern shores, whereas pure quartzose sand of R ıo Paran a is found only adjacent to its prograding delta. Augite-rich sand supplied by the R ıo Colorado is dominant along the coast of the Buenos Aires Province, where it mixes locally with coarser-grained quartz-rich detritus recycled in the urbanized Mar del Plata area. Hypersthene-rich sand of the R ıo Negro is dispersed both north and south of the mouth, where heavy-mineral-rich lag deposits are formed in areas of accelerated erosion and retreating sea cliffs. Changes of mineralogical signatures during long-distance littoral transport are largely ascribed to local supply from coastal erosion or hydrodynamic effects rather than to selective breakdown of labile grains. Whereas the relative abundance of amphibole and pyroxene is largely independent of transport distance, olivine is depleted both in the northern part of the Colorado littoral cell and south of the R ıo Negro mouth, which is chiefly ascribed to dilution by recycling of Neogene sediments that have undergone early intrastratal dissolution rather than to mechanical loss.Keywords Amphibole Color Index, Colorado and Negro rivers, durability of olivine and pyroxene, longshore sand transport, passive-margin sediments, R ıo de la Plata estuary, R ıo Desaguadero, sedimentary petrology, Southern Hemisphere swells.

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Morphology and Short-Term Changes of the Caleta Valdés Barrier Spit, Argentina

Cited by 33 publications

References 2 publications

Sand spit rhythmic development: A potential record of wave climate variations? Arçay Spit, western coast of France

Sand spit rhythmic development: A potential record of wave climate variations? Arçay Spit, western coast of France

Análisis cronológico de las ocupaciones humanas en la cuenca inferior del río Deseado, Patagonia Argentina

From Patagonia to Río de la Plata: Multistep long‐distance littoral transport of Andean volcaniclastic sand along the Argentine passive margin

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