Articolo in rivista, 2014, ENG, 10.1002/2014GC005332
Schildgen, T. F.; Cosentino, D.; Cosentino, D.; Frijia, G.; Castorina, F.; Castorina, F.; Dudas, F. O.; Iadanza, A.; Sampalmieri, G.; Cipollari, P.; Cipollari, P.; Caruso, A.; Bowring, S. A.; Strecker, M. R.
1Institut fEURur Erd- und Umweltwissenschaften and DFG-Leibniz Center for Surface Processes and Climate Studies, University of Potsdam, Potsdam, Germany, 2Dipartimento di Scienze, Universita degli Studi Roma Tre, Rome, Italy, 3Instituto di Geologia Ambientale e Geoingegneria-CNR, Rome, Italy, 4Dipartimento di Scienze della Terra, Universita degli Studi La Sapienza, Rome, Italy, 5Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA, 6Dipartimento di Scienze della Terra e del Mare, Universita degli Studi di Palermo, Palermo, Italy
Sr isotope records from marginal marine basins track the mixing between seawater and local continental runoff, potentially recording the effects of sea level, tectonic, and climate forcing in marine fossils and sediments. Our 110 new 87Sr/86Sr analyses on oyster and foraminifera samples from six late Miocene stratigraphic sections in southern Turkey, Crete, and Sicily show that 87Sr/86Sr fell below global seawater values in the basins several million years before the Messinian Salinity Crisis, coinciding with tectonic uplift and basin shallowing. 87Sr/86Sr from more centrally located basins (away from the Mediterranean coast) drop below global seawater values only during the Messinian Salinity Crisis. In addition to this general trend, 55 new 87Sr/86Sr analyses from the astronomically tuned Lower Evaporites in the central Apennines (Italy) allow us to explore the effect of glacio-eustatic sea level and precipitation changes on 87Sr/86Sr. Most variation in our data can be explained by changes in sea level, with greatest negative excursions from global seawater values occurring during relative sea level lowstands, which generally coincided with arid conditions in the Mediterranean realm. We suggest that this greater sensitivity to lowered sea level compared with higher runoff could relate to the inverse relationship between Sr concentration and river discharge. Variations in the residence time of groundwater within the karst terrain of the circum-Mediterranean region during arid and wet phases may help to explain the single (robust) occurrence of a negative excursion during a sea level highstand, but this explanation remains speculative without more detailed paleoclimatic data for the region.
Geochemistry, geophysics, geosystems 15 (7), pp. 2964–2983
groundwater residence, late Miocene, Lower Evaporites, Mediterranean, sea level changes
ID: 352379
Year: 2014
Type: Articolo in rivista
Creation: 2016-03-18 09:28:55.000
Last update: 2016-03-18 09:31:05.000
CNR authors
External links
OAI-PMH: Dublin Core
OAI-PMH: Mods
OAI-PMH: RDF
DOI: 10.1002/2014GC005332
URL: http://www.scopus.com/record/display.url?eid=2-s2.0-84906251715&origin=inward
External IDs
CNR OAI-PMH: oai:it.cnr:prodotti:352379
DOI: 10.1002/2014GC005332
Scopus: 2-s2.0-84906251715