http://hdl.handle.net/11336/90181 Capítulos de libros de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER" Tue, 09 Apr 2024 15:07:54 GMT 2024-04-09T15:07:54Z http://hdl.handle.net/11336/203250 Cuatrocientos años de la historia hidroecológica de la laguna Chascomús Laprida, Cecilia; Plastani, María Sofía Los espejos de agua de la Encadenada del Salado, y en especial la Laguna Chascomús, tienen un papel fundamental para el desarrollo de la región. Su potencial económico, a partir del turismo, la pesca recreativa y otras actividades vinculadas, es una cuestión que desde el Ministerio de Desarrollo Agrario estamos comprometidos a atender y acompañar, sin descuidar el ambiente.En este sentido, este libro se propone difundir conocimiento para comprender, utilizar y preservarestos recursos; ¿cómo podríamos cuidar lo que no se conoce? Se trata de un intento de entender en profundidad las dinámicas ecosistémicas que suceden en estos cuerpos de agua y la forma en que la comunidad se vincula con ellos para habilitar nuevos la sociedad y la naturaleza.Esta publicación sobre la Laguna Chascomús resulta fundamental y emblemática. En primer lugar, porque con su belleza singular, admirada y reconocida por los y las bonaerenses, esta laguna forma parte, sin duda, de una parte importante de la historia de la región, de la Provincia y del país. En segundo lugar, el libro es un claro ejemplo del potencial del trabajo interdisciplinario en ciencias.Desde las diferentes disciplinas, los autores dan cuenta de la complejidad propia de los ambienteslagunares, abordando aspectos físicos, biológicos y también históricos, sociales, y económicos para conformar una mirada integral, que resulta fundamental para la mejor administración y gestión de los bienes comunes. Con una mirada interdisciplinaria, este libro apor ta formas de comprender a la laguna como un ambiente que es también un medio productivo, y que debe ser hoy valorado como tal por toda la población. Desde el Ministerio de Desarrollo Agrario sostenemos que el impulso a cualquier actividad productiva debe tener en cuenta desde su gestación que la misma debe ser sustentable. Por otro lado, el libro es resultado ulterior, no necesariamente buscado, de un trabajo cotidiano, incansable, de muchos años de dos investigadores, Gustavo Berasain y Leandro Miranda, que han teni do la iniciativa de convocar también a otros especialistas para su elaboración de este libro. Berasain y Miranda trabajan en la Estación Hidrobiológica del Ministerio de Desarrollo Agrario y en el INTECH (UN-SAM-CONICET), respectivamente, ambos en radicadas en la provincia de Buenos Aires con capacidad de estudiar en profundidad temas de la propia región. Por eso, más allá de las trayecto-rias personales, este libro también es expresión del potencial en materia de investigación e innovación tecnológica que tiene Chascomús. Nuestro compromiso con el conocimiento, el desarrollo productivo sostenible y el cuidado del ambiente requiere del esfuerzo mancomunado de todos los actores comprometidos con los valores y principios tendientes a preservar lo que pertenece a todos los bonaerenses. Necesitamos ahora profundizar estos estudios interdisciplinarios y replicarlos en otros ambientes lagunares para desarrollar nuestras fuerzas productivas en armonía con la naturaleza. Estamos convencidos de que con este libro, se está aportando conocimiento en el sentido indicado. Sat, 01 Jan 2022 00:00:00 GMT http://hdl.handle.net/11336/203250 2022-01-01T00:00:00Z http://hdl.handle.net/11336/202930 An Overview on the Crocodylomorpha Cranial Neuroanatomy: Variability, Morphological Patterns and Paleobiological Implications Barrios, Francisco; Bona, Paula; Paulina Carabajal, Ariana; Leardi, Juan Martín; Holliday, Casey; Lessner, Emily An overview of the neuroanatomy and the principal anatomical transformations of the cranial endocast of the main lineages of Crocodylomorpha are presented. One of the main transformations of the cranial endocast within pseudosuchians seems to be the lateral extension of the cerebral hemispheres, occurred near the node Crocodyliformes and interpreted as a reversal in thalattosuchians and dyrosaurids to cranial endocast with narrow cerebral hemispheres. Relatively larger cerebral hemispheres indicate greater processing of environmental information and more complex responses. Prominent olfactory bulbs and expanded optic lobes of several terrestrial notosuchians are linked to greater olfactory acuity and visual capacity. Inner ear morphology is mostly conservative in Crocodylomorpha; however, the vestibulum and lagena are dorsoventrally short in Almadasuchus and aquatic crocodyliforms. Relative sizes of the trigeminal fossa and maxillomandibular foramen showed an increase in size along the line to amphibious crown crocodylians, contrasting with putatively terrestrial crocodyliforms as protosuchids and several notosuchians, further suggesting that somatosensation evolved later in the group than previously proposed (but depending on the phylogenetic position of thalattosuchians). Neuroanatomical information at the base of Crocodylomorpha-Crocodyliformes and within Mesoeucrocodylia is relatively scarce, but crucial to understanding the neurological novelties developed by the group in terrestrial and aquatic environments. Sat, 01 Jan 2022 00:00:00 GMT http://hdl.handle.net/11336/202930 2022-01-01T00:00:00Z http://hdl.handle.net/11336/199581 Growth of the Southern Patagonian Andes (46 -53°S) and its relation with subduction processes Ghiglione, Matias; Ramos, Victor Alberto; Cuitiño, José Ignacio; Barberon, Vanesa The Cretaceous-Cenozoic evolution of the Southern Patagonian Andes is one of the most prominent examples of coupling between subduction processes and climatic, magmatic, deformational, and sedimentary events. Three orogenic and magmatic cycles can be particularly related to processes in the subduction zone (1) Late Cretaceous closure of the Rocas Verdes marginal basin, (2) Paleogene collisionof the Farallón-Aluk seismic ocean ridge, and (3) Miocene subduction of the Chile seismic ridge beneath South America. Andean orogenic growth started during Late Cretaceous times, in a tectonic scenario that included the Rocas Verdes back-arc oceanic basin, widening from 49°S toward the south. The Andean segment south of 49°S experienced a strong Cenomanian?Santonian deformational event during theclosure of the back-arc basin and progressive subduction of its ocean floor. The final closure produced the Coniacian?Santonian exhumation of the Sarmiento Ophiolitic Complex and propagation of the orogenic front toward the foreland. The second cycle, during Paleogene deformation, coincided with an Eocene volcanic arc gap, and seems to be related to the Fallarón-Phoenix seismic ridge collision. The resulting slab window produced OIB volcanic plateaux represented by the Chile Chico and Posadas Basalts, erupted in the foothills and retroarc. The third cycle of accelerated Andean uplift started during the Oligocene, as a consequence of orthogonal and fast subduction of young lithosphere, while the Chile seismic ridge between Antarctica and Nazca was approaching the trench. Kinematic plate reconstructions show that at approximately 14?18 Ma the Chile oceanic ridge entered the South America trench and migrated northward from 53°S to its present-day position at 46°S. The early Miocene ridge collision and resulting slab window produced an extensive OIB magmatism between 10 and 3 Ma in extra-Andean Patagonia. The space-time unraveling of tectonic uplift is well known from geochronometers, and shows a migration from the basement domain to the external fold and thrust belt accompanied by lower Miocene synorogenic sedimentation. Orogenic growth led to middle Miocene rain shadow in the foothills, followed by the late Miocene?Pliocene desertification of Patagonia. Fri, 01 Jan 2016 00:00:00 GMT http://hdl.handle.net/11336/199581 2016-01-01T00:00:00Z http://hdl.handle.net/11336/185441 Progression of the Deformation in the Southern Central Andes (37ºS) Sagripanti, Lucía; Folguera Telichevsky, Andres; Fennell, Lucas Martín; Rojas Vera, Emilio Agustin; Ramos, Victor Alberto This chapter analyzes the deformational pulses and mechanisms thataffected the Southern Central Andes across 37°S. Four zones were analyzed indetail that from west to east are the Cordillera del Viento, the Tromen volcanicplateau, the Sierra de Reyes, and the Chachahuén volcanic complex. Each of thesezones shows evidence of one or more deformational stages that affected the Andeanmargin from the Late Cretaceous onwards. Due to the contrasting structure andgeology, different methodologies were applied for their study, (i) balanced structuralcross sections to represent structure at depth, (ii) use of potential methods(gravimetry and magnetometry) for a subsurface constraint, (iii) geochronologicalanalyses using U/Pb dating of detrital zircons in synorogenic sequences to determinemaximum ages and source areas, (iv) morphometric analyses in the drainagenetwork in order to analyze the activity of neotectonic structures during landscapeevolution. As a result, an evolutionary model is presented for the Southern CentralAndes in which four pulses of deformation were recognized in agreement withprevious proposals, although with a variable distribution reflecting a complexpattern. In particular, the Cordillera del Viento area in the westernmost sectorregisters an uplift stage that occurred during the Late Cretaceous followed by a lateMiocene reactivation. The mechanisms associated with this uplift are related to theselective reactivation of half-grabens and generation of new thrusts cutting throughthe extensional architecture. To the east, the Tromen volcanic plateau registers apre-Miocene stage of uplift, later affected by a neotectonic reactivation.Localization of neotectonic activity could be related to the emplacement ofasthenospheric material and consequent weakening of the upper crust, as revealedby magnetotelluric studies. In the orogenic front, the Sierra de Reyes was initiallyuplifted during Eocene times and subsequently suffered a strong reactivation duringthe Neogene. This last stage produced synorogenic successions in the Sierra de Reyes foredeep describing an unroofing sequence. Finally, the Neogene deformationalstage exhumed Lower Cretaceous sequences in the foreland region before7 Ma expanding considerably the orogenic wedge. Thus, the Chos Malal fold andthrust belt shows a foreland sequence development between the Upper Cretaceousand Eocene, that was followed by a sudden expansion of the orogenic wedge in lateMiocene times and reactivation of the western sectors. Finally, Quaternaryout-of-sequence thrusts define an active orogenic front at the midsection of the foldand thrust belt. Thu, 01 Jan 2015 00:00:00 GMT http://hdl.handle.net/11336/185441 2015-01-01T00:00:00Z