Palaeoenvironments of the Mediterranean Basin at the Messinian hypersaline/hyposaline transition: evidence from natural radioactivity and microfacies of post-evaporitic successions of the Adriatic sub-basin
| Autor: | Sergio Lo Mastro, Annalisa Iadanza, Paola Cipollari, Domenico Cosentino, Gianluca Sampalmieri |
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| Přispěvatelé: | Sampalmieri, G., Iadanza, A., Cipollari, Paola, Cosentino, D., S., Lo Mastro, Sampalmieri, G, Iadanza, A, Cipollari, P, Cosentino, Domenico, LO MASTRO, S. |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | TERRA nova 22 (2010): 239–250. info:cnr-pdr/source/autori:Sampalmieri G., Iadanza A., Cipollari P., Cosentino D., Lo Mastro S./titolo:Palaeoenvironments of the Mediterranean Basin at the Messinian hypersaline%2Fhyposaline transition: evidence from natural radioactivity and microfacies of post-evaporitic successions of the Adriatic sub-basin/doi:/rivista:TERRA nova (Print)/anno:2010/pagina_da:239/pagina_a:250/intervallo_pagine:239–250/volume:22 |
| Popis: | At the end of the Messinian salinity crisis, changes in the palaeoceanography and palaeoclimate induced a transition from hypersaline to hyposaline conditions in the Mediterranean water body. Detailed investigation of natural radioactivity and microfacies analyses of two early post-evaporitic Messinian sections show that the transition occurred in poorly oxygenated and well-stratified water masses. These transitional deposits, which mainly consist of marls and CaCO3-rich horizons, are generally well laminated and totally barren in benthic and planktonic fauna. The presence of barite, small (5–8 lm) authigenic framboidal pyrite, and high values of U indicate persistent anoxic conditions during the early postevaporitic Messinian stage in the Adriatic sub-basin of the Mediterranean Sea. The presence of post-evaporitic welllaminated barren deposits from both Mediterranean borderland sections and ODP sites suggests that these anoxic conditions extended to other sub-basins of the Mediterranean region. |
| Databáze: | OpenAIRE |
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