Examinando por Autor "Bini, Monica"
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Acceso Abierto Geomorphologic Map of Northeastern Sector of San Jorge Gulf (Chubut, Argentina)(2011) Isola, Ilaria; Bini, Monica; Ribolini, Adriano; Pappalardo, Marta; Consoloni, Ilaria; Fucks, Enrique; Boretto, Gabriela; Ragaini, Luca; Zanchetta, GiovannoThis paper presents a 1:100,000 scale geomorphologic map of the Northeastern sector of San Jorge Gulf (Chubut Province) in Patagonia, Argentina, covering more than 1,000 km2 . Derived from remote sensing data and validated by three field surveys, it has been compiled in order to understand the past and recent evolution of the area with particular reference to sea-level oscillation studies, for which this map is the basic tool. The very low human impact and rates of dynamic landscape change allow the preservation of extensive palaeo deposits and landforms, including those indicative of sea-level variations. The relative change of sea level dominates landscape evolution, allowing the formation of widespread marine and lagoon deposits often interfingering with fluvial deposits and reworked by aeolian process in the framework of consequent beach progradation. - Artículo
Embargado Holocene Beach Ridges and Coastal Evolution in the Cabo Raso Bay (Atlantic Patagonian Coast, Argentina)(2011) Ribolini, Adriano; Aguirre, Marina L.; Baneschi, Ilaria; Consoloni, Ilaria; Fucks, Enrique; Isola, Ilaria; Mazzarini, Francesco; Pappalardo, Marta; Zanchetta, Giovanni; Bini, MonicaThe Holocene evolution of the Cabo Raso bay (Atlantic Patagonian coast) was reconstructed by means of geomorphological, stratigraphic, and palaeontological analyses, assisted by radiocarbon dating. Six beach ridges were individuated and mapped in the field, as well as some rocky erosional landforms,e.g.,inner margins of marine terraces. Thanks to quarry sections, the internal structure of beach ridges, their relationship with continental deposits, and the fossil contents were determined. Two specimens ofAulacomya atraandBrachidontes purpuratuswere radiocarbon dated at 6055 and 4500 ± 20 YBP, respectively. The bedrock outcrops at the base of an analysed section allowed us to associate the age of the samples collected to the elevation of the marine transgression surface upon which the entire deposit rests. Because a beach ridge is a regressive form, the elevation of the base of the dated deposit was assumed to be equivalent to or slightly lower than the maximum sea-level stationing, represented by the inner margin of the coheval marine terrace. The altimetric correlation between the base of the beach ridge dated at 6055 ± 20 YBP and the inner margin of the corresponding marine terraces allowed us to constrain the maximum Holocene marine transgression to about 3 to 2m above sea level. This elevation for the maximum Holocene transgression is lower than that shown by most of the previous data for Patagonian coast, but it shows a crude agreement with recent estimates coming from geophysical models that report, for this area, a departure from the eustatic value of sea level, mainly caused by glacioisostatic process. This means that the employment of marine erosional landforms, associated with other multisource field data, proved to be determinant for reconstructing the sea-level variation in the Patagonian coast. - Artículo
Embargado Late- Pleistocene Wedge Structures Along The Patagonian Coast (Argentina): Chronological Constraints And Palaeo-Environmental Implications(2014) Ribolini, Adriano; Bini, Monica; Consoloni, Ilaria; Isola, Ilaria; Pappalardo, Marta; Zanchetta, Giovanni; Fucks, Enrique; Panzeri, Laura; Martini, Marco; Terrasi, FilippoThis paper investigates several wedge structures formed in continental deposits covering marine sediments deposited during MIS 5 along the central Patagonian coast of Argentina. The size and surface microtexture characteristics of the infilling sediments are consistent with a depositional environment dominated by aeolian transport. Fragments of Andean volcanic rocks (glass shards) in the wedge-fill suggest long-distance transport via a westerly component of wind direction. The wedges are interpreted as products of deep seasonal frost action in frozen ground, which produced open cracks that filled rapidly with partially non-local aeolian sediments. Many wedges cross cut carbonate crusts that formed under permafrost conditions in coastal Patagonia. The radiocarbon dating of carbonate crusts yielded an age of 25–27 kyrbp, while wedge-fill sediments are OSL dated to 14 670 ± 750 yrbp. This indicates that ground wedge formation occurred during a cold event (the Antarctic Cold Reversal period) that interrupted the permafrost degradation following the Last Glacial Maximum. - Artículo
Embargado New insights on the Holocene marine transgression in the Bahía Camarones (Chubut, Argentina)(2012) Zanchetta, Giovanni; Consoloni, Ilaria; Isola, Ilaria; Pappalardo, Marta; Ribolini, Adriano; Aguirre, Marina; Fucks, Enrique; Baneschi, Ilaria; Bini, Monica; Ragaini, Luca; Terrasi, Filippo; Boretto, GabriellaThe stratigraphic reconstruction of the northern sector of theBahía Camarones (Chubut, Argentina) allowed to improve ourunderstanding of the Holocene marine transgression in the area.The first phase of the maximum of the transgression, is interpretedas dominated by the high rate of eustatic rise of sea level until ca.6-7 ka BP possiblyassociated to sedimentary starvation as suggestedby fossil accumulation. After this first phase, the general trend indi-cates a progressive fall of the relative sea level after the MiddleHolocene high stand as documented in other parts of south Amer-ica Atlantic coast. Our data, coupled with the robust radiocarbondata set available for the area from literature, indicate three mainlocal steps of coastal aggradation between ca. 6600 and 5400 yr BP(ca. 7000-5600 yr cal BP), ca. 3300 and 2000 yr BP (ca. 3100-1700 yrcal BP), and ca. 1300-500 yr BP (ca. 1000-300 yr cal BP). A signifi-cant age gap in coastal aggradation is present between ca. 5300 and4400 yr BP (ca. 5600-4500 yr cal BP), and perhaps between ca 2000and 1300 yr BP (ca. 1700-1000 yr cal BP). These can be linked tophases of local sea level fall and/or phases of sedimentary starvationand/or changes in drift transport which can have produced localcoastal cannibalization. However, no conclusive data can beadvanced. Data obtained from careful measurements of sea levelmarkers represented by the top of marsh and fluvial terraces indi-cate lower values for the sea level estimation compared with thedata set previously proposed for the area. This stigmatizes the factthat field-oriented works are still the priority in the Patagonia coastalong with accurate age measurement, especially for obtaining thefundamental information we need for predicting the environmentalimpact, in these coastal areas,from accelerate sea level rise as effectof global warming.