scholarly journals Calcareous nannofossil size and abundance response to the Messinian Salinity Crisis onset and paleoenvironmental dynamics

2021 ◽  
Author(s):  
A. M. Mancini ◽  
M. Grelaud ◽  
P. Ziveri ◽  
E. Nallino ◽  
F. Lozar
Keyword(s):  
Messinian Salinity Crisis ◽  
Calcareous Nannofossil

scholarly journals Calcareous nannofossil and foraminiferal trace element records in the Sorbas Basin: A new piece of the Messinian Salinity Crisis onset puzzle

2020 ◽  
Vol 554 ◽  
pp. 109796
Author(s):  
Alan Maria Mancini ◽  
Rocco Gennari ◽  
Patrizia Ziveri ◽  
P. Graham Mortyn ◽  
Davey Joey Stolwijk ◽  
...  
Keyword(s):  
Trace Element ◽  
Messinian Salinity Crisis ◽  
Calcareous Nannofossil

Calcareous nannofossil size as a proxy for the Messinian Salinity Crisis dynamics

2020 ◽  
Author(s):  
Alan Maria Mancini ◽  
Patrizia Ziveri ◽  
Michael Grelaud ◽  
Francesca Lozar
Keyword(s):  
Extreme Events ◽  
Environmental Variability ◽  
Size Reduction ◽  
Messinian Salinity Crisis ◽  
Stressed Condition ◽  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
Variable Environment ◽  
Basin Scale ◽  
The Mediterranean

<p>Dwarfism is a common feature affecting organism during and after extreme events that characterized the geological history. The organism size reductions are frequently referred as the result of “stressed condition”. Such changes occurred for instance during Oceanic Anoxic Events and are well recorded in the fossil assemblage of calcareous marine organisms. To date, no study addressed the morphological and biometric changes during the Messinian Salinity Crisis (MSC), one of the most recent and impacting event occurred in the Mediterranean Sea.</p><p>Here we focus on morphometric changes affecting calcareous nannofossils at the MSC onset in order to better constrain the paleoenvironmental changes and the “stressed conditions” that characterized this interval. Samples were collected in the Perales section (Sorbas Basin, West Mediterranean) in which size characterization of 50 specimens of 4 different calcareous nannofossil taxa (<em>Helicosphaera carteri</em>, <em>Sphenolithus abies</em>, <em>Umbilicosphaera rotula</em> and <em>Coccolithus pelagicus</em>) was performed in each sample, along with their absolute abundances (number of nannofossils over gram of dry sediment).  In order to test the reliability of the obtained data and demonstrate that the size change recorded at the MSC onset was a basin-scale event, 2 sections in the Piedmont Basin (Banengo and Pollenzo), encompassing the same time period were also analysed. In addition, size changes and cyclicity related to orbital forces were addressed in a high temporal resolution size and calcite mass analysis performed on <em>Reticulofenestra minuta</em>, using an automated image analyses system of calcareous nannofossils recognition (SYRACO) on several cycles encompassing the MSC onset.</p><p>A significant size reduction affected the calcareous nannofossil taxa involved in the MSC onset biostratrigraphic event in both the North and West Mediterranean sections. These morphometric changes were related to the restriction of the Mediterranean Basin, resulting in an increase in both productivity and environmental variability, stimulating  calcareous nannofossils growth rate and decreasing their cell and sizes. The <em>R. minuta</em> size and calcite mass correlate with the change in the orbital variability, governed mostly by precession, with minimum values recorded during the cyclical diatomite deposition in the Sorbas Basin. In this case, the size reduction was triggered by the precession-induced enhanced environmental variability that characterized the diatomitic deposition.</p><p>Our findings highlight the relevance of calcareous nannofossil morphometry and mass to trace the dynamics of extreme events, such as the MSC. Size and mass changes of selected calcareous nannofossils taxa at the MSC onset suggest that “stressed conditions” characterizing this event likely coincide with the instauration of a highly variable environment, linked to the restriction of the paleo Gibraltar strait. </p>

scholarly journals LATE MIOCENE CALCAREOUS NANNOFOSSIL STRATIGRAPHY AND BIOEVENTS CORRELATION: KALIDONIA CASE SECTION (NW CRETE, GREECE)

2018 ◽  
Vol 40 (1) ◽  
pp. 1
Author(s):  
S. Bellas ◽  
D. Frydas ◽  
H. Keupp
Keyword(s):  
Deep Water ◽  
Late Miocene ◽  
Messinian Salinity Crisis ◽  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
Type Section ◽  
First Occurrence ◽  
Upper Tortonian ◽  
Depositional Cycle ◽  
Quantitative Approaches

Calcareous nannofossils are widely used for biostratigraphic correlations. Quantitative approaches enable better understanding of reliability of bioevents. In order to refine the late Miocene stratigraphy ofNW Crete, the deposits of Kalidonia basin along its type section are here investigated. It was possible to distinguish the Tortonian/Messinian boundary by NNlla & NNllb, CN9a & CN9b, MNNlla & MNNllb biozones. Reticulofenestra pseudoumbilicus PB (Paracme Beginning) and R. rotaria FO (First Occurrence) proved to act as additional significant biohorizons improving the stratigraphie evolution of the studied paleobasin and providing a tight biochronologic framework. The Kalidonia section fully covers an undisturbed marine depositional cycle from the upper Tortonian to upper Messinian, where a predominant deep water fades (DWF) is followed by transitional sediments (TF) and the sequence closes at the top by a reefal-bioclastic fades (RF) relative to the 'Calcare di Base ' in Italy indicating the 'Messinian Salinity Crisis Event.

The northernmost record of the Messinian salinity crisis (Piedmont basin, Italy)

2016 ◽  
Vol 8 (2.1) ◽  
pp. 1-58 ◽  
Author(s):  
Francesco Dela Pierre ◽  
Marcello Natalicchio ◽  
Francesca Lozar ◽  
Sabrina Bonetto ◽  
Giorgio Carnevale ◽  
...  
Keyword(s):  
Messinian Salinity Crisis

Earliest Miocene calcareous nannofossil biostratigraphy from the low-latitude Pisco Basin (Peru)

Stratigraphy ◽  
2019 ◽  
Vol 16 (2) ◽  
pp. 87-105
Author(s):  
Emilia R. Belia ◽  
Kevin E. Nick ◽  
Erika Bedoya Agudelo ◽  
David K. Watkins
Keyword(s):  
Calcareous Nannofossil ◽  
Low Latitude ◽  
Calcareous Nannofossil Biostratigraphy
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