The magnetic anomaly field in the Southern Tyrrhenian Sea: new constraints for its evolutionary history
| when | seminars and |
|---|---|
| When | 29/11/2007 from 14:30 to 23:55 |
| Where | Rome Conference Room |
| Reference person | Silvia Nardi |
| Contact email address | |
| Telephone number for contacts | +39 06 51860386 |
| Add the event to your calendar |  vCal (Windows, Linux) iCal (Mac OS |
29 November 2007, 14.30 pm | Iacopo Nicolosi | Conference Room Rome | Headquarters | Young researchers seminars Section Rome 2
The study of the magnetic anomaly field of the oceanic crust represents one of the applications of the potential methods that have most influenced the understanding of the evolutionary history of the Earth. The identification of magnetized bands of oceanic crust with different polarity has allowed the detailed reconstruction of the times and ways of formation of the oceanic crust itself, according to the mechanism called "oceanic spreading".
The western Mediterranean, consisting of two main basins of diachronal back-arc, represented by the Ligurian-Provençal basin and the Tyrrhenian basin, evolved due to the eastward migration of the Ionian-Adriatic subduction system, starting from the Late Oligocene.
The Tyrrhenian back-arc basin was formed starting from the Late Miocene at an average expansion rate of 6 cm/year, according to data obtained from the Ocean Drilling Program (ODP) Leg 107; these suggest that the deepest part of the southern Tyrrhenian Sea (3000-3500 m), represented by the Vavilov and marsili, consist largely of oceanic crust, about 15000 km2 whose formation took place between the lower-middle Pliocene and the Pleistocene. Despite the information obtained from ODP Leg 107 relating to the oceanization process of the basins, the analysis of the magnetic anomalies of the region had never shown the clear presence of linear anomalies typical of oceanic crust.
Our research group has carried out a new analysis of the magnetic anomalies of the southern Tyrrhenian Sea by identifying clear linear oceanic anomalies associated with the Vavilov and Marsili basins, setting new constraints on the determination of the various evolutionary phases of the Tyrrhenian Sea.
The western Mediterranean, consisting of two main basins of diachronal back-arc, represented by the Ligurian-Provençal basin and the Tyrrhenian basin, evolved due to the eastward migration of the Ionian-Adriatic subduction system, starting from the Late Oligocene.
The Tyrrhenian back-arc basin was formed starting from the Late Miocene at an average expansion rate of 6 cm/year, according to data obtained from the Ocean Drilling Program (ODP) Leg 107; these suggest that the deepest part of the southern Tyrrhenian Sea (3000-3500 m), represented by the Vavilov and marsili, consist largely of oceanic crust, about 15000 km2 whose formation took place between the lower-middle Pliocene and the Pleistocene. Despite the information obtained from ODP Leg 107 relating to the oceanization process of the basins, the analysis of the magnetic anomalies of the region had never shown the clear presence of linear anomalies typical of oceanic crust.
Our research group has carried out a new analysis of the magnetic anomalies of the southern Tyrrhenian Sea by identifying clear linear oceanic anomalies associated with the Vavilov and Marsili basins, setting new constraints on the determination of the various evolutionary phases of the Tyrrhenian Sea.