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.
Sampalmieri G., Iadanza A., Cipollari P, & Cosentino D. & S. Lo Mastro (2010). 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. TERRA NOVA, 22(4), 239-250 [10.1111/j.1365-3121.2010.00939.x].
Titolo: | 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 | |
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Data di pubblicazione: | 2010 | |
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Citazione: | Sampalmieri G., Iadanza A., Cipollari P, & Cosentino D. & S. Lo Mastro (2010). 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. TERRA NOVA, 22(4), 239-250 [10.1111/j.1365-3121.2010.00939.x]. | |
Abstract: | 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. | |
Handle: | http://hdl.handle.net/11590/136935 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |