Paleoclimatic and paleoceanographic changes in the Mediterranean sea during the last 20 kyr; the response of planktonic and benthonic communities

Author(s): Amore, Filomena Ornella; Ciampo, Giuliano
Author Affiliation(s): Primary:
Universita del Sannio, Italy
Other:
Universita "Federico II", Italy
Volume Title: 33rd international geological congress; abstracts
Source: International Geological Congress [International Geological Congress, Abstracts = Congrès Géologique International, Résumés, Vol.33; 33rd international geological congress, Oslo, Norway, Aug. 6-14, 2008. Publisher:], [location varies], International CODEN: IGABBY
Note: In English
Summary: The fossil record is the main tool to reconstruct the evolution of life on Earth. Because continuous and deep relationships exist between the biota and the abiotic environment, the analysis of the structures of the biotic assemblages has a key-role in the understanding the history of our planet. The planktonic and benthonic assemblages, which are widespread from coastal areas to open ocean, are a tool to investigate the paleoclimatic changes and the development of the Earth climate system and to predict its future evolution. The planktonic (coccolithophores and planktonic foraminifers) and benthonic (ostracods) assemblages of ODP Site 974 located in the central Tyrrhenian Sea and the assemblages of piston cores C -106, C-101 and C9, located in the Gulf of Salerno and Gaeta were analyzed. The oxygen isotope stratigraphy, the calcareous nannofossils events and C14 data, provided the stratigraphic constrains (Amore et al, 2000; Buccheri et al., 2002). The studied interval ranges from MIS 1 to MIS 3. This interval is characterized by intense changes of environmental factors like light, salinity, temperature of water masses, nutrient availability, terrigenous inputs and water turbidity, which are directly related to climatic and global sea level changes. The cores have been sampled at an average spacing distance of 2 cm. The quantitative counting and the statistical analysis of the planktonic and benthonic assemblages is focused to highlight the evolution of the last glacial-interglacial transition and the Holocene climate instabilities. The abundance data of species like Globorotalia truncatulinoides, Orbulina universa and Globigerinella siphonifera, which are considered warm-water indicators, and the variations of species like Globorotalia scitula, Turborotalita quinqueloba and Globigerinita uvula, which indicate cold-water conditions, have been analysed. Among calcareous nannofossils the abundance data of species like Syracosphaera pulchra, Rhabdosphaera clavigera and Helicosphaera carteri, which are considered subtropical species, and the variations of the cold-water species as Coccolithus pelagicus and Gephyrocapsa mullerae have been used. Benthic assemblages have been used for the bottom paleoenvironmental reconstruction and paleobathymetry curves have been reconstructed on the polynomial analysis of ostracoda assemblages. References Amore F.O., Ciampo G., DiDonato V., Esposito P., Ermolli E.& Staiti D. 2000-An integrated micropaleontological approach applied to Late Pleistocene-Holocene paleoclimatic changes (Gaeta Bay, Italy). Royal Geol. Soc., special issue, London,95-111. Buccheri G., Capretto G., Di DonatoV., Esposito P., Ferruzza G., Pescatore T. Russo Ermolli E., Senatore M.R., Sprovieri M., Bertoldo M., Carella D., Madonna G.,2002.A high resolution record of the last deglaciation in the south Tyrrhenian Sea: environmental and climatic evolution. Mar. Geol.186, 447-470.
Year of Publication: 2008
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Assemblages; Benthic environment; C-14; Carbon; Cenozoic; Climate change; Foraminifera; Fossil record; Globigerinacea; Globorotalia; Globorotalia truncatulinoides; Globorotaliidae; Habitat; Invertebrata; Isotopes; Leg 161; Mediterranean Sea; Microfossils; Nutrients; ODP Site 974; Ocean Drilling Program; Paleoclimatology; Paleoenvironment; Planktonic taxa; Protista; Quaternary; Radioactive isotopes; Reconstruction; Rotaliina; Sea-level changes; Tyrrhenian Sea; West Mediterranean
Coordinates: N402122 N402122 E0120831 E0120831
Record ID: 2014026049
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by International Geological Congress Organizational Committee