Le caractere rythmique des evaporites messiniennes en Mediterranee orientale (coupe d'Eraclea Minoa, Sicile)

Nesteroff, Wladimir D.; Glacon, G.

doi:10.2113/gssgfbull.s7-xix.3.489

Cited by 10 publications

(5 citation statements)

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“…The cyclic pattern of the Sicilian Upper Evaporites (six gypsum – clay cyclothems) has been described by many authors (Fig. a; Decima & Wezel, ; Nesteroff & Glaçon, ; Homewood et al ., ; Bonaduce & Sgarrella, ; Rouchy & Caruso, ; Krijgsman & Meijer, ; Manzi et al ., ), especially in the Eraclea Minoa key‐section (Figs and c). The calibration of the Upper Evaporites with the Astronomical Tuned Neogene Time Scale (ATNTS2004: Lourens et al ., ) from 5.52 to 5.332 Ma has been proposed considering a continuous sedimentation in the Sicilian Basin during the peak of the MSC (Krijgsman & Meijer, ; Roveri et al ., ,b).…”

Section: Onshore Datamentioning

confidence: 68%

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A two‐step process for the reflooding of theMediterranean after theMessinianSalinityCrisis

et al. 2011

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The Messinian Salinity Crisis is well known to have resulted from a significant drop of the Mediterranean sea level. Considering both onshore and offshore observations, the subsequent reflooding is generally thought to have been very sudden. We present here offshore seismic evidence from the Gulf of Lions and re‐visited onshore data from Italy and Turkey that lead to a new concept of a two‐step reflooding of the Mediterranean Basin after the Messinian Salinity Crisis. The refilling was first moderate and relatively slow accompanied by transgressive ravinement, and later on very rapid, preserving the subaerial Messinian Erosional Surface. The amplitude of these two successive rises of sea level has been estimated at ≤500 m for the first rise and 600–900 m for the second rise. Evaporites from the central Mediterranean basins appear to have been deposited principally at the beginning of the first step of reflooding. After the second step, which preceeded the Zanclean Global Stratotype Section and Point, successive connections with the Paratethyan Dacic Basin, then the Adriatic foredeep, and finally the Euxinian Basin occurred, as a consequence of the continued global rise in sea level. A complex morphology with sills and sub‐basins led to diachronous events such as the so‐called ‘Lago Mare’.This study helps to distinguish events that were synchronous over the entire Mediterranean realm, such as the two‐step reflooding, from those that were more local and diachronous. In addition, the shoreline that marks the transition between these two steps of reflooding in the Provence Basin provides a remarkable palaeogeographical marker for subsidence studies.

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Section: Onshore Datamentioning

confidence: 68%

“…the highest relative sea level) (Homewood et al ., ). This interpretation is supported by geochemistry (Pierre & Fontes, ), foraminifers (Nesteroff & Glaçon, ), dinoflagellate cysts (Londeix et al ., ) and pollen grains (Suc & Bessais, ; Fauquette et al ., ).…”

Section: Onshore Datamentioning

confidence: 74%

A two‐step process for the reflooding of theMediterranean after theMessinianSalinityCrisis

et al. 2011

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“…Possibly a replacement of aragonite by dolomite was favoured by the precipitationof CaSO, and consequent increase of the Mg/Ca ratio in the interstitial waters. As suggested by Butler (1973) and Olaussen (1981), the Sr released from aragonite during this transformation may have been utilized for the formation of celestite (Fig. 6F).…”

Section: Aragonite In Marl and Carbonate Layersmentioning

confidence: 77%

Isotope geochemistry, petrology and depositional environments of the diatomite‐dominated Tripoli Formation (Lower Messinian), Sicily

Bellanca¹,

Calderone²,

Neri³

1986

Sedimentology

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The Tripoli Formation (Lower Messinian) in Sicily includes diatomites irregularly alternating with marl and carbonate beds and lies, stratigraphically, between the Tortonian pelagic marls and the evaporitic Calcare di base. The relationships between mineralogy, textural features and oxygen‐carbon isotopic compositions of carbonate components point to a wide variability of depositional conditions and suggest that Tripoli sedimentation occurred in small basins characterized by periodic and marked restriction from the open sea. The isotopic values of calcite and dolomite in the diatomites suggest an evolution from normal marine towards more restricted environments. Evaporating conditions are also indicated by the occurrence of anhydrite, length‐slow chalcedonic quartz and moulds of gypsum. In a more advanced stage, the precipitation of heavy δ180 dolomite in the interstitial pores of fossil‐poor diatomites denotes an environment with highly evaporated water. Mixing of meteoric and marine waters, on the other hand, might have favoured the precipitation of a dolomite characterized by relatively low δ180 and δ13C values. The deposition of marl and carbonate beds alternating with or overlying the diatomites took place in an environment with highly evaporated marine waters on the basis of δl18O values of dolomite (up to + 9.10‰) and aragonite (up to + 5.83‰), occurrence of evaporitic minerals and lack of fossils. The presence at these levels of calcite with extremely negative δ13C values (down to ‐ 38.40‰), filling gypsum moulds, suggests activity of sulphate‐reducing bacteria. Some aragonitic marls, however, bear evidence of deposition in relatively normal marine conditions.

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“…During the lowstand (interval E1), halite was deposited in the lower part of the marginal basin. During the following highstand, open marine clays were deposited above the salt in the deeper basin (well B2; upper clay intervals of the Sicilian Upper Evaporites : Nesteroff and Glac¸on, 1977) and gypsum beds landward in transgressive lagoons (Lower Medjerda Basin). Similarities between the fluvial deposits overlying sequence boundary SB2 in northern Tunisia and continental facies above the Sicilian Lower Evaporites are so striking that we link them.…”

Section: Discussionmentioning

confidence: 99%

Messinian deposits and erosion in northern Tunisia: inferences on Strait of Sicily during the Messinian Salinity Crisis

et al. 2009

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International audienceOutcrops, 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

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Le caractere rythmique des evaporites messiniennes en Mediterranee orientale (coupe d'Eraclea Minoa, Sicile)

Cited by 10 publications

References 0 publications

A two‐step process for the reflooding of theMediterranean after theMessinianSalinityCrisis

A two‐step process for the reflooding of theMediterranean after theMessinianSalinityCrisis

Isotope geochemistry, petrology and depositional environments of the diatomite‐dominated Tripoli Formation (Lower Messinian), Sicily

Messinian deposits and erosion in northern Tunisia: inferences on Strait of Sicily during the Messinian Salinity Crisis

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