Fuentes cartográficas para el estudio de la propiedad de la tierra de la Provincia de Buenos Aires : Chascomús, Ranchos y Monte, 1822-1864

En este trabajo se reconstruye el registro gráfico de 1864 y se comparan los resultados con otros ya desarrollados para 1822, 1830 y 1850, todos en la parte correspondiente a los partidos de Chascomús, Ranchos y Monte. Así, se correlacionan series completas de datos provenientes de duplicados de mensuras, solicitudes de tierras, protocolos de escribanos y testamentarias, con el fin de analizar la extensión de los campos y la tenencia de la tierra en estos partidos. De esta manera se aporta información para utilizar con mejores resultados la cartografía disponible para la época, revelando sus posibilidades expresivas en la comprensión de la ocupación y acceso a la propiedad legal de la tierra durante el siglo XIX, en ese sentido, aquí se evalúa el parcelamiento de los terrenos y el grado de concentración de la propiedad

Postglacial deposition of sand in the Eckernfoerder Bay, western Baltic Sea

At the NW-slope of Eckernforder Bay (Western Baltic) between 14 and 21 m water depth 7 sand cores were taken with a vibrocorer. The cores were between 85 and 250 cm long. The sand was analysed for grain size distribution, proportions of organic carbon and carbonate, and contents of microfossils. The radiometric age and stable carbon isotope ratios were determined on organic material from 14 sample. With regard to benthic foraminifera and other microorganisms four different types of depositional conditions could be distinguished: Types 1 and 2: two types of offshore sand areas. Type 3: lagoon and nearshore. Type 4: subaerial or limnic. Using sedimentological and geochemical parameters two formation areas could be distinguished with the aid of a discriminant analysis: offshore (types 1 and 2) and nearshore (types 3 and 4). A juxtaposition of core sections indicated two distinct profiles. Their ages fit into the picture of the assumed postglacial sea-level rise. The lagoon- and nearshore sands are interpreted as the result of sea-level stagnation at 17-18 m below present sea-level. The accumulation rates of the sand in the offshore areas are, with a maximum of 0.15 mm/yr., an order of magnitude smaller than in the mud areas, located several hundred metres away.

Fuentes cartográficas para el estudio de la propiedad de la tierra de la Provincia de Buenos Aires : Chascomús, Ranchos y Monte, 1822-1864

En este trabajo se reconstruye el registro gráfico de 1864 y se comparan los resultados con otros ya desarrollados para 1822, 1830 y 1850, todos en la parte correspondiente a los partidos de Chascomús, Ranchos y Monte. Así, se correlacionan series completas de datos provenientes de duplicados de mensuras, solicitudes de tierras, protocolos de escribanos y testamentarias, con el fin de analizar la extensión de los campos y la tenencia de la tierra en estos partidos. De esta manera se aporta información para utilizar con mejores resultados la cartografía disponible para la época, revelando sus posibilidades expresivas en la comprensión de la ocupación y acceso a la propiedad legal de la tierra durante el siglo XIX, en ese sentido, aquí se evalúa el parcelamiento de los terrenos y el grado de concentración de la propiedad

Sand fraction, carbonate and organic carbon contents of ODP Hole 175-1085A

Site 1085 is located on the continental rise of southwest Africa at a water depth of 1713 m off the mouth of the Orange River in the Cape Basin. The site is part of the suite of locations drilled during Leg 175 on the Africa margin to reconstruct the onset and evolution of the elevated biological productivity associated with the Benguela Current upwelling system (Wefer, Berger, Richter, et al., 1998, doi:10.2973/odp.proc.ir.175.1998). Three sediment samples were collected per section from Cores 170-1085A-28H through 45X (251-419 mbsf) to provide a survey of the sediment record of paleoproductivity from the middle late Miocene to the early Pliocene (~8.7-4.7 Ma), which is a period that includes the postulated northward migration and intensification of the Benguela Current and the establishment of modern circulation off southwest Africa (Siesser, 1980; Diester-Haass et al., 1992; Berger et al., 1998). Core 170-1085A-30H (270-279 mbsf) had essentially no recovery; this coring gap was filled with samples from Cores 170-1085B-29H and 30H (261-280 mbsf). The results of measurements of multiple paleoproductivity proxies are summarized in this report. Included in these proxies are the radiolarian, foraminiferal, and echinoderm components of the sand-sized sediment fraction. Opal skeletons of radiolarians (no diatoms were found) relate to paleoproductivity and water mass chemistry (Summerhayes et al., 1995, doi:10.1016/0079-6611(95)00008-5; Lange and Berger, 1993, doi:10.2973/odp.proc.sr.130.011.1993; Nelson et al., 1995, doi:10.1029/95GB01070). The accumulation rates of benthic foraminifers are useful proxies for paleoproductivity (Herguera and Berger, 1991, doi:10.1130/0091-7613(1991)019<1173:PFBFAG>2.3.CO;2; Nees, 1997, doi:10.1016/S0031-0182(97)00012-6; Schmiedl and Mackensen, 1997, doi:10.1016/S0031-0182(96)00137-X) because these fauna subsist on organic matter exported from the photic zone. Echinoderms also depend mainly on food supply from the photic zone (Gooday and Turley, 1990), and their accumulation rates are an additional paleoproductivity proxy. Concentrations of calcium carbonate (CaCO3) and organic carbon in sediment samples are fundamental measures of paleoproductivity (e.g., Meyers, 1997, doi:10.1016/S0146-6380(97)00049-1). In addition, organic matter atomic carbon/nitrogen (C/N) ratios and delta13C values can be used to infer the origin of the organic matter contained within the sediments and to explore some of the factors affecting its preservation and accumulation (Meyers, 1994, doi:10.1016/0009-2541(94)90059-0).