109 research outputs found
Néolithisation et néolithique : Libye et Sahara
Le terme âNĂ©olithique saharienâ comprend en gĂ©nĂ©ral un complexe de traits culturels qui se sont manifestĂ©s entre 10 000 et 5 000 ans dans la partie centrale du Sahara comprise entre 15° et 25° Lat. Nord. Parmi les aspects novateurs qui caractĂ©risent ces cultures â diffĂ©rents Ă©lĂ©ments technologiques, aspects artistiques et modĂšles dâĂ©tablissements â ce sont lâapparition de la cĂ©ramique et la production de nourriture, avec une Ă©conomie pastorale qui reprĂ©sentent indubitablement les aspects les ..
SUSTAIN drilling at Surtsey volcano, Iceland, tracks hydrothermal and microbiological interactions in basalt 50 years after eruption
The 2017 Surtsey Underwater volcanic System for Thermophiles, Alteration processes and INnovative concretes (SUSTAIN) drilling project at Surtsey volcano, sponsored in part by the International Continental Scientific Drilling Program (ICDP), provides precise observations of the hydrothermal, geochemical, geomagnetic, and microbiological changes that have occurred in basaltic tephra and minor intrusions since explosive and effusive eruptions produced the oceanic island in 1963â1967. Two vertically cored boreholes, to 152 and 192âm below the surface, were drilled using filtered, UV-sterilized seawater circulating fluid to minimize microbial contamination. These cores parallel a 181âm core drilled in 1979. Introductory investigations indicate changes in material properties and whole-rock compositions over the past 38 years. A Surtsey subsurface observatory installed to 181âm in one vertical borehole holds incubation experiments that monitor in situ mineralogical and microbial alteration processes at 25â124ââC. A third cored borehole, inclined 55â in a 264â azimuthal direction to 354âm measured depth, provides further insights into eruption processes, including the presence of a diatreme that extends at least 100âm into the seafloor beneath the Surtur crater. The SUSTAIN project provides the first time-lapse drilling record into a very young oceanic basaltic volcano over a range of temperatures, 25â141ââC from 1979 to 2017, and subaerial and submarine hydrothermal fluid compositions. Rigorous procedures undertaken during the drilling operation protected the sensitive environment of the Surtsey Natural Preserve
âDynamics of populations, movements and responses to climatic changes in Africaâ. II Workshop del Forum for African Archaeology and Cultural Heritage.
II workshop organizzato a Roma del Forum per l'Archeologia african
Missione Archeologica Italiana nellâ Oasi di Farafra
WWW. Archeogate.it/egittologia/NILO/missioni italian
âCultural Heritage Management and Field-work methods in Africaâ. III Workshop del Forum for African Archaeology and Cultural Heritage. Roma 3-5 Dicembre, UniversitĂ âLa Sapienzaâ.
Environment and Population in the Final Pleistocene of Jebel Gharbi (Libya) - Perspectives on the North African epipaleolithic.
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