Vigliotti, Luigi and Asioli, Alessandra and Bergami, Caterina and Capotondi, Lucilla and Piva, Andrea (2011) Magnetic properties of the youngest sapropel S1 in the Ionian and Adriatic Sea: inference for the timing and mechanism of sapropel formation. Italian journal of geosciences, 130 (1). pp. 106-118. ISSN 2038-1727
![[img]](http://eprints.bice.rm.cnr.it/style/images/fileicons/application_pdf.png) |
PDF
08_(23-10)_VIGLIOTTI_106-118.pdf - Published Version Restricted to Repository staff only Download (3MB) |
Abstract
The youngest sapropel S1 has been investigated by a multiproxy study on a core (ET99-M11) collected in the western Ionian Sea at a water depth of 2800 m, which is considered to represent anoxic conditions in the eastern Mediterranean at the time of sapropel formation. Selected geochemical parameters (TOC, Ba/Al, MnO) as well as micropaleontological analysis (planktic foraminifera), rock magnetic data, and 14C dating indicate that anoxic conditions prevailed between 10.4 and 5.7 ka BP. The comparison among the different proxies indicates that rock magnetic parameters can be unambiguously used to precisely identify sapropel layers, even if no iron sulphide phases have been precipitated as a bi-product of diagenetic breakdown of organic matter. By using the magnetic parameters as indicators of paleoredox conditions we compare the results with cores collected in the central and southern Adriatic Sea at different water depths. A shorter duration (9.6/9-7/6.8 ka BP) of the sapropel S1 was observed in the deepest southern part of the basin and in the Meso Adriatic Depression whereas suboxic conditions continued in cores collected at very shallow water depth of 56 m along the western margin of the basin. The formation of the Adriatic Deep Water driven by decreasing solar radiation output is considered responsible for the interruption and end of sapropel formation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Sapropel, Sediment, Magnetic Properties, Foraminifera, Central Mediterranean, Holocene |
| Subjects: | 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia > 551.9 Geochimica 500 Scienze naturali e Matematica > 550 Scienze della Terra > 552 Petrologia (Classificare qui la Petrografia, la Litologia, le rocce) > 552.5 Rocce sedimentarie (Classificare qui le opere d'insieme sulla Sedimentologia) |
| Depositing User: | Users 66 not found. |
| Date Deposited: | 23 Dec 2011 14:18 |
| Last Modified: | 23 Dec 2011 14:18 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/3652 |
Actions (login required)
 |
View Item |
