Depósitos burdigalianos de la Formación Santa Cruz en Sierra Baguales, Cuenca Austral (Magallanes): Edad, ambiente de deposición y vertebrados fósiles.

Bostelmann, J. E.; Roux, J.P. Le; Vasquez, Ana; Gutiérrez, Néstor M.; Oyarzún, José Luis; Carreño, Catalina; Torres, Teresa; Otero, Rodrigo A.; Llanos, Andrea; Hervé, Francisco

doi:10.5027/andgeov40n3-a04

Cited by 7 publications

(3 citation statements)

References 74 publications

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“…Cenomanian through Campanian deep-marine sedimentation was followed by southward basin filling and shoaling upward to Maastrichtian shallow-marine and deltaic facies ( Figure 1) [Macellari et al, 1989;Fildani et al, 2008;Covault et al, 2009;Romans et al, 2011]. The Upper Cretaceous basin fill is unconformably overlain by shallow-marine and continental Paleocene through Miocene strata ( Figure 1) [Biddle et al, 1986;Malumián et al, 2000;Otero et al, 2012;Bostelmann et al, 2013].…”

Section: Magallanes Foreland Basinmentioning

confidence: 99%

Influence of attenuated lithosphere and sediment loading on flexure of the deep-water Magallanes retroarc foreland basin, Southern Andes

2014

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Flexural subsidence in foreland basins is controlled by applied loads-such as topography, water/sediment, and subcrustal forces-and the mechanical properties of the lithosphere. We investigate the controls on subsidence observed within the Upper Cretaceous Magallanes retroarc foreland basin of southern South America to evaluate the impact of lateral variations in flexural rigidity due to Late Jurassic extension. Conventional elastic models cannot explain the observed basin deflection and thick accumulation of deep-water Cenomanian-Turonian basin strata. However, models in which the lithosphere has been previously thinned and deflects under topographic and sedimentary loads successfully reproduce regional subsidence patterns. Results satisfy paleobathymetric observations in the Magallanes Basin and suggest that lithospheric thinning is necessary to produce both long-wavelength and deep subsidence during Late Cretaceous basin evolution. Results indicate that elastic thickness decreases westward from~45-25 km in the distal foreland to~37-15 km beneath the foredeep. These findings are consistent with a westward reduction in crustal thickness associated with the Jurassic extensional history of the Patagonian lithosphere. Our results also show that sediment loading exerts an important control on regional deflection patterns and promotes a wider region of subsidence and reduced forebulge uplift. We propose that lateral variations in mechanical properties and large sediment loads restrict depocenter migration and may cause the foredeep to remain fixed for prolonged periods of time. These findings confirm that loading of thinned lithosphere imposes different mechanical controls on the flexural profile and have potential implications for other retroarc foreland basins characterized by earlier extensional histories.

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Section: Magallanes Foreland Basinmentioning

confidence: 99%

Influence of attenuated lithosphere and sediment loading on flexure of the deep-water Magallanes retroarc foreland basin, Southern Andes

2014

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“…In some parts of the SBMR the glacial cirques are developed over sedimentary rocks of the Eocene Man Aike Formation, a sequence of shales, sandstones and conglomerates with numerous mollusk fossils that overlies the Cretaceous Dorotea Formation and is, in turn, overlain by continental shales and sandstones rich in plant fossils belonging to the Río Leona Formation. The latter is followed by sandstones, conglomerates and mudstones of the Estancia 25 de Mayo and Santa Cruz Formations (Le Roux et al, 2010;Bostelmann et al, 2013). Gutiérrez et al (2013) mentioned that the Estancia 25 de Mayo Formation is intruded by laccolith-type plutons and olivine-gabbro sills.…”

Section: Climatic and Geological Settingmentioning

confidence: 99%

Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50º S), inferred from the morphometric analysis of glacial cirques

Araos

Roux

Kaplan

et al. 2018

andgeo

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The Sierra Baguales Mountain Range, forming the eastern foothills of the Southern Patagonian Andes, has well-developed alpine-glaciated landforms which present an ideal opportunity to study climatic and non-climatic factors that control cirque development and morphology. One hundred and forty-three glacial cirques were studied with reference to 14 morphometric attributes which were analyzed using statistical analysis and GIS methodologies. The cirques were classified into two types using cluster analysis complimented with a composite map based on the attributes, the latter technique that is applied to glacial cirque analysis for the first time. Type 1 cirques are associated with glacial processes isolated from the Southern Patagonian Ice Field (SPIF), developed under locally cold and dry climatic conditions. Type 2 glacial cirques are associated with older, more extensive glacial processes controlled by regional-scale climate variables and the presence of the Pleistocene Ice Sheet. The results show that the development of most of the glacial cirques has been controlled mainly by their aspect, exposure to solar radiation, Southern Hemisphere Westerly winds, and cirque floor slope. Finally, we concluded that our analyses show the evolution of cirques in the Sierra Baguales Mountain Range was not uniform. Cirque glaciers that developed to the west, close to the Southern Patagonian Ice field, have been more dynamic, and therefore their cirques experienced more erosion than those located to the east.

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“…y el puma (Puma concolor), además de una variedad de aves, mustélidos y roedores (Muñoz-Pedreros y Yáñez, 2000). En cuanto a sus características geomorfológicas, sierra Baguales destaca por presentar una de las más completas e ininterrumpidas secuencias sedimentarias Mesozoicas-Cenozoicas de la cuenca austral de Sudamérica (Gutiérrez et al, 2013), las cuales incluyen a las formaciones Las Flores (Man Aike), La Cumbre, Río Leona, Estancia 25 de Mayo y Santa Cruz (Bostelmann et al, 2013). La emergencia de estas formaciones generó la disponibilidad de diversas materias primas líticas, facilitando así que grupos cazadores-recolectores obtuvieran rodados y bloques de diferente tipo y calidad, tanto en sectores altos de la sierra como en sus alrededores.…”

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Arqueología de Cerro Guido y Sierra Baguales, Chile: avances en la reconstrucción de sociedades cazadoras-recolectoras de ambientes de estepa y montaña al noreste de Magallanes

Sierpe,

Palacios,

Martin

et al. 2024

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Se presentan los resultados de la prospección y sondeos arqueológicos realizados en la zona de cerro Guido y sierra Baguales (2021). La investigación abarcó cuatro sectores entre el norte del río las Chinas y el área comprendida entre el chorrillo Las Flores y la formación geológica del mismo nombre. Antecedentes previos indican evidencias líticas en superficie asociadas al curso del río Baguales y la existencia de sitios fúnebres de tipo “chenque” en cerro Guido (ca. 1150-300 años AP). Durante las prospecciones se registraron decenas de hallazgos en superficie, además de cinco sitios arqueológicos a cielo abierto de grandes dimensiones sugiriendo de esta manera una ocupación más amplia del territorio por parte de grupos cazadores-recolectores terrestres. Los sondeos permiten inferir preliminarmente la explotación de especies terrestres y el aprovisionamiento de materias primas líticas río arriba y/o en sectores altos próximos a la sierra Baguales. Nuevas dataciones amplian la cronología conocida con una antigüedad de ca. 2500 años AP. En el extremo sur de la formación Las Flores, el sondeo de un abrigo rocoso permitió el hallazgo de restos óseos humanos aislados y dispersos en un contexto inusual para la zona, donde hasta el momento sólo se registraban entierros en “chenque”.

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Depósitos burdigalianos de la Formación Santa Cruz en Sierra Baguales, Cuenca Austral (Magallanes): Edad, ambiente de deposición y vertebrados fósiles.

Cited by 7 publications

References 74 publications

Influence of attenuated lithosphere and sediment loading on flexure of the deep-water Magallanes retroarc foreland basin, Southern Andes

Influence of attenuated lithosphere and sediment loading on flexure of the deep-water Magallanes retroarc foreland basin, Southern Andes

Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50º S), inferred from the morphometric analysis of glacial cirques

Arqueología de Cerro Guido y Sierra Baguales, Chile: avances en la reconstrucción de sociedades cazadoras-recolectoras de ambientes de estepa y montaña al noreste de Magallanes

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