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., L.M. (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].

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

CIPOLLARI, PAOLA;
2010-01-01

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.
Sampalmieri, G., Iadanza, A., Cipollari, P., Cosentino, D., S., L.M. (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].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/136935
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