Fragm. lat. VI 66 - Breviarium (De lancea et clavis)

Trägerbände: Inc. qu. 979; Inc. oct. 271 Bd. 1; Vorbesitzer: Dominikanerkloster Frankfurt am Main

Annotated record of the detailed examination of Mn deposits from the R/V Rig Seismic Cruise 11 (BMR 66) in 1986 over the Great Australian Bight Basin area

Late Cretaceous and younger sediments dredged from the upper continental slope and canyon walls in the Great Australian Bight Basin between 126° and 136°E broadly confirm the stratigraphy which had been established previously from scattered exploration wells. Late Cretaceous to Early Eocene marine and marginal marine terrigenous sediments are overlain by Middle Eocene and younger pelagic carbonate (fine limestone and calcareous ooze). The samples provide the first evidence of truly marine Maastrichtian sedimentation, with abundant calcareous nannoplankton, on the southern margin of the continent. Other samples of interest include Precambrian sheared granodiorite on the upper slope south of Eyre Terrace, Paleocene phosphatic sediment in 'Eucla' Canyon at 128° 30'E, and terrigenous Early Miocene mudstone at 133° 20' and 134° 50'E. The mudstone is of note as an exception to the uniform pelagic carbonate wackestone and ooze which characterise Middle Eocene and younger sedimentation at all other sites. Fragments of alkali basalt lava of unknown age were recovered in 'Eucla' Canyon. Cores are mostly pelagic calcareous ooze, but those from submarine canyons include terrigenous turbidites.

La construcción de un Departamento Científico en un proceso intensivo de modernización académica : El caso de la física en Cs. Exactas (UBA), 1955-66

Fil: Buschini, José Daniel. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Modernización académica y politización cultural. El caso de la Univ. de B.Aires, 1955-66 : Líneas de interpretación histórica

Fil: Prego, Carlos Alberto. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

La construcción de un Departamento Científico en un proceso intensivo de modernización académica : El caso de la física en Cs. Exactas (UBA), 1955-66

Fil: Buschini, José Daniel. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Modernización académica y politización cultural. El caso de la Univ. de B.Aires, 1955-66 : Líneas de interpretación histórica

Fil: Prego, Carlos Alberto. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

La construcción de un Departamento Científico en un proceso intensivo de modernización académica : El caso de la física en Cs. Exactas (UBA), 1955-66

Fil: Buschini, José Daniel. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Modernización académica y politización cultural. El caso de la Univ. de B.Aires, 1955-66 : Líneas de interpretación histórica

Fil: Prego, Carlos Alberto. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Chemistry and grain-size distribution of terrigenous sediments deposited at Site GeoB9501

The Sahara Desert is the largest source of mineral dust in the world. Emissions of African dust increased sharply in the early 1970s, a change that has been attributed mainly to drought in the Sahara/Sahel region caused by changes in the global distribution of sea surface temperature. The human contribution to land degradation and dust mobilization in this region remains poorly understood, owing to the paucity of data that would allow the identification of long-term trends in desertification. Direct measurements of airborne African dust concentrations only became available in the mid-1960s from a station on Barbados and subsequently from satellite imagery since the late 1970s: they do not cover the onset of commercial agriculture in the Sahel region ~170 years ago. Here we construct a 3,200-year record of dust deposition off northwest Africa by investigating the chemistry and grain-size distribution of terrigenous sediments deposited at a marine site located directly under the West African dust plume. With the help of our dust record and a proxy record for West African precipitation we find that, on the century scale, dust deposition is related to precipitation in tropical West Africa until the seventeenth century. At the beginning of the nineteenth century, a sharp increase in dust deposition parallels the advent of commercial agriculture in the Sahel region. Our findings suggest that human-induced dust emissions from the Sahel region have contributed to the atmospheric dust load for about 200 years.