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Narjess El Euch-El Koundi Serge Ferry Jean-Pierre Suc Georges Clauzon Mihaela Carmen Melinte-Dobrinescu Christian Gorini Anissa Safra Fouad Zargouni 《地学学报》2009,21(1):41-48
Outcrops, offshore wells, electric logs and seismic profiles from northern Tunisia provide an opportunity to decipher the Messinian Salinity Crisis in the Strait of Sicily. Messinian deposits (including gypsum beds) near the Tellian Range reveal two successive subaerial erosional surfaces overlain by breccias and marine Zanclean clays, respectively. In the Gulf of Tunis, Messinian thick evaporites (mostly halite) are strongly eroded by a fluvial canyon infilled with Zanclean clays. The first erosional phase is referred to the intra-Messinian tectonic phase and is analogous to that found in Sicily. The second phase corresponds to the Messinian Erosional Surface that postdates the marginal evaporites, to which the entire Sicilian evaporitic series must refer. The Western and Eastern Mediterranean basins were separated during deposition of the central evaporites. 相似文献
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Phospholipid ester-linked fatty acids composition of size-fractionated particles at the top ocean surface 总被引:1,自引:0,他引:1
Anissa Brinis Laurence Mjanelle Andr Momzikoff Genevive Gondry Joëlle Fillaux Vanessa Point Alain Saliot 《Organic Geochemistry》2004,35(11-12):1275
Surface microlayer and subsurface water samples were collected at an oligotrophic Mediterranean site during a diel cycle. The composition of phospholipid ester-linked fatty acids (PLFA) was determined in size-fractionated particles (0.2–0.7 μm; 0.7–200 μm) in order to characterize the major contributors of organic matter to different size fractions. GF/F-retained particles (0.7–200 μm) from the surface microlayer were consistently enriched in PLFA relative to the underlying water. Molecular markers revealed a substantial difference in biological assemblages in both particle sizes. The larger particles were dominated by dinoflagellates, cyanobacteria, microzooplankton and attached bacteria, whereas particles filtered through GF/F and collected on 0.2 μm porosity Durapore filters (0.2–0.7 μm) were mostly bacteria and heterotrophic flagellates. Bacterial PLFA associated with 0.7–200 μm particles were more abundant than those in the 0.2–0.7 μm particles. Specific markers in the branched series appeared more representative of bacteria of smaller particle size. 相似文献
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Mahleb Anissa Hadji Riheb Zahri Farid Boudjellal Rania Chibani Abdelmohcen Hamed Younes 《Geotechnical and Geological Engineering》2022,40(8):4217-4230
Geotechnical and Geological Engineering - Soil erosion is one of the major environmental problems in the Middle East and North Africa (MENA) region. Favoured by the harmful effects of climate... 相似文献
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