Calcareous Plankton Analysis in the Pre-Evaporitic Sediments of the ODP Site 654 (Tyrrhenian Sea, Western Mediterranean)

Flores, José-Abel; Sierro, Francisco Javier; Glacon, G.

doi:10.2307/1485792

Cited by 21 publications

(20 citation statements)

References 22 publications

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“…Theodoridis (1984) found the A. delicatus FO to be positioned slightly above the A. primus FO and slightly below the R. rotaria FCO. The same succession of events is also reported by Flores et al (1992) from ODP Site 654 where the A. delicatus FO is observed in the middle part of former Chron 6 (Fig. 6).…”

Section: Amaurolithus Delicatus Fosupporting

confidence: 84%

“…This increase is observed within subzone CN9a between the D. berggrenii and A. primus FO's. Although this increase is likely related to some ecological factor, Flores et al (1992) demonstrated that this event is synchronous between the Spanish and Moroccan corridors and Northeast Atlantic DSDP sites. In Mediterranean ODP Site 654, the increase in small reticulofenestrids was not detected even though a clear dominance of small placoliths can be observed in fig.…”

Section: Acme Begin (Ab) and Acme Top (At) Of 'Small' Reticulofenestridsmentioning

confidence: 89%

“…In the Sale Briqueterie drill core (northwestern Morocco), Hodell et al (1994) found the FO of A. primus in Chron C4n.2n whereas Rakic El Bied and Benson (1996) recorded the same event at a slightly younger level, at the C3Bn=C3Br boundary, in the Ain el Beida section located nearby. In the equatorial Pacific and Indian Ocean, the FO of A. primus is recorded in Chron C3Br , while, in the Mediterranean, this event is detected in former Chron 6, equivalent to the C3Bn=C3Br boundary (Flores et al, 1992) (Fig. 6).…”

Section: Amaurolithus Primus Fomentioning

confidence: 98%

“…6; Guercif Basin -Tazzi, 1996; ODP Site 654 - Flores et al, 1992) as well as in extra-Mediterranean successions such as ODP sites 846, 849 and 850 in the equatorial Pacific (Raffi and Flores, 1995). In the Mediterranean, the FCO is recorded slightly above the A. delicatus FO at ODP Site 654 (Flores et al, 1992) and in the Falconara section (Theodoridis, 1984). It is thus likely that all specialists have been observing the R. rotaria FCO (and not the FO).…”

Section: Reticulofenestra Rotaria Fo and Fcomentioning

confidence: 98%

“…In Mediterranean ODP Site 654, the increase in small reticulofenestrids was not detected even though a clear dominance of small placoliths can be observed in fig. 3 of Flores et al (1992). The base of the small reticulofenestrids Acme is probably located below core 45 where they started their analysis.…”

Section: Acme Begin (Ab) and Acme Top (At) Of 'Small' Reticulofenestridsmentioning

confidence: 99%

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Calcareous nannofossil biostratigraphy of the M. del Casino section (northern Apennines, Italy) and paleoceanographic conditions at times of Late Miocene sapropel formation

Negri

Giunta

Hilgen

et al. 1999

Marine Micropaleontology

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A detailed quantitative calcareous nannofossil analysis has been performed on 138 samples from the astronomically dated Monte del Casino section with the aim to identify and precisely date the most important calcareous nannofossil events across the Tortonian=Messinian boundary in the Mediterranean, and to unravel paleoceanographic conditions at times of sapropel formation during the Late Miocene. From the biostratigraphic perspective, the genus Amaurolithus provides three successive first occurrences (FOs): A. primus, A. cf. amplificus and A. delicatus, dated at 7.446, 7.434 and 7.226 Ma, respectively. Other bioevents include the base and top of the 'small reticulofenestrids' Acme, dated at 7.644 and 6.697 Ma, and the FO, FCO and LO of R. rotaria, dated at 7.405, 7.226 and 6.771 Ma. These events appear to be useful in improving biostratigraphic resolution in the Tortonian-Messinian boundary interval, at least for the Mediterranean. Quantitative analysis revealed changes in the calcareous nannofossil assemblage associated with the sapropels. The observed fluctuations suggest a single mechanism for sapropel formation in the Mediterranean during the late Neogene. Sapropels are characterized by a decrease in the total number of coccoliths, interpreted mainly as a reduction in calcareous nannofossil production due to increased siliceous plankton production during spring blooms; and an increase in reworked specimens, interpreted to reflect enhanced continental input via river run-off. An increase in abundance of the genus Rhabdosphaera can be explained by opportunistic behavior at the end of the spring bloom when nutrient levels start to become impoverished. As far as sea surface water temperature indicators are concerned, warm water D. pentaradiatus shows positive fluctuations in sapropels while cooler water D. intercalaris and C. pelagicus show negative fluctuations.

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Section: Amaurolithus Delicatus Fosupporting

confidence: 84%

Section: Acme Begin (Ab) and Acme Top (At) Of 'Small' Reticulofenestridsmentioning

confidence: 89%

Section: Amaurolithus Primus Fomentioning

confidence: 98%

Section: Reticulofenestra Rotaria Fo and Fcomentioning

confidence: 98%

Section: Acme Begin (Ab) and Acme Top (At) Of 'Small' Reticulofenestridsmentioning

confidence: 99%

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Calcareous nannofossil biostratigraphy of the M. del Casino section (northern Apennines, Italy) and paleoceanographic conditions at times of Late Miocene sapropel formation

Negri

Giunta

Hilgen

et al. 1999

Marine Micropaleontology

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Zanclean/Piacenzian transition on Cyprus (SE Mediterranean): calcareous nannofossil evidence of sapropel formation

et al. 2015

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Quantitative analyses of calcareous nannofossils in the sediments of Pissouri South section on the island of Cyprus have produced a paleoceanographic record reflecting the paleoclimatic conditions during the Zanclean/Piacenzian transition. Pissouri South cyclical lithological alternations between organic-rich laminated layers and grey marls reflect the Earth's orbital precession. According to the calcareous nannofossil biostratigraphy which has been performed, the studied section is correlated with MNN14/15 and MNN16 calcareous nannofossil biozones and is astronomically dated between 4.065 and 3.217 Ma. Intervals of increased organic carbon content, along with the positive values of Florisphaera profunda, Helicosphaera sellii, Discoaster spp. and the subsequent increase of stratification S-index, correspond to the sapropel deposition during periods of wetter climate and intense continental runoff, especially from the river Nile. These layers alternate with grey marly intervals, featured by the increased values of small placoliths of Reticulofenestra and Gephyrocapsa species, which are indicative of eutrophic conditions during intense surface-water mixing. Our data support the prevalence of a generally warm phase characterized by the absence of high-frequency climate variations in the southeastern Mediterranean during the Zanclean/Piacenzian (Early/Late Pliocene) transition.

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Calcareous nannofossil biostratigraphy of the marine Oligocene and Miocene succession in some wells in Northern Egypt

2016

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Calcareous Plankton Analysis in the Pre-Evaporitic Sediments of the ODP Site 654 (Tyrrhenian Sea, Western Mediterranean)

Cited by 21 publications

References 22 publications

Calcareous nannofossil biostratigraphy of the M. del Casino section (northern Apennines, Italy) and paleoceanographic conditions at times of Late Miocene sapropel formation

Calcareous nannofossil biostratigraphy of the M. del Casino section (northern Apennines, Italy) and paleoceanographic conditions at times of Late Miocene sapropel formation

Zanclean/Piacenzian transition on Cyprus (SE Mediterranean): calcareous nannofossil evidence of sapropel formation

Calcareous nannofossil biostratigraphy of the marine Oligocene and Miocene succession in some wells in Northern Egypt

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