Magnetostratigraphy of Pliocene-Pleistocene sediments from the eastern Mediterranean Sea


Richter, Carl, Roberts, Andrew P., Stoner, Joseph S., Benning, L. David and Chi, Cung T. (1998) Magnetostratigraphy of Pliocene-Pleistocene sediments from the eastern Mediterranean Sea. In, Robertson, A.H.F., Emeis, K.-C., Richter, C. and Camerlenghi, A. (eds.) Procs of ODP Scientific Results. Vol.160. Mediterranean I: covering Leg 160 of the cruises of the Drilling Vessel "Joides Resolution", Las Palmas, Gran Canaria, to Naples, Italy, Sites 963-973, 7 March - 3 May 1995. College Station, TX, USA, Texas A & M University Ocean Drilling Program, 61-73. (Proceedings of the Ocean Drilling Program Scientific Results 160).

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Description/Abstract

Detailed paleomagnetic investigations were conducted to develop a magnetostratigraphic framework for sedimentary
sequences that were recovered by hydraulic piston coring in the Eastern Mediterranean Sea (Ocean Drilling Program Leg 160).
A total of 1556 discrete samples from seven sites were subjected to detailed demagnetization, and high-resolution measurements
of the magnetic properties of >100 m of sediments were made using “U-channel” samples (measurements at 1-cm intervals).
The main magnetic carriers are probably an iron sulfide mineral and magnetite; occasional hematite were also present.
Between 10% and 50% of the samples displayed erratic magnetic behavior and could not be used for magnetostratigraphic
analysis. In addition, between 5% and 49% of the samples were completely overprinted by the coring process and had significantly
higher paleomagnetic inclinations (>75°) than would be expected for an axial dipole field (inclinations of 49°-52°) at the
site latitudes. Despite the coring-induced remagnetization and problems with the stability of magnetization, a sound magnetostratigraphic
chronology was established at some sites. This chronology provides support for stratigraphic correlations within
the basin and with onshore sequences as well as a temporal framework for paleoenvironmental studies that will enable assessment
of the origin of organic-rich sapropel layers frequently found in the Mediterranean Sea and adjacent onshore sequences.

Item Type: Book Section
Subjects: Q Science > QE Geology
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 66110
Date Deposited: 30 Apr 2009
Last Modified: 27 Mar 2014 18:47
URI: http://eprints.soton.ac.uk/id/eprint/66110

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