Carl Richter,2 Andrew P. Roberts,3 Joseph S. Stoner,4,6 L. David Benning,5 and Cung T. Chi2,7


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.

1Robertson, A.H.F., Emeis, K.-C., Richter, C., and Camerlenghi, A. (Eds.), 1998. Proc. ODP, Sci. Results, 160: College Station, TX (Ocean Drilling Program).
2Ocean Drilling Program and Department of Geology and Geophysics, Texas A&M University, College Station, TX 77845, U.S.A. richter@tamu.edu
3Department of Oceanography, University of Southampton, Southampton Oceanography Centre, Southampton SO14 3ZH, United Kingdom.
4Department of Geology, University of Florida, Gainesville, FL 32611, U.S.A.
5Department of Geology, University of California, Davis, CA 95616, U.S.A.
6Present address: Department of Geology, University of California, Davis, CA 95616, U.S.A.
7Present address: Department of Geology, National Taiwan University, Taipei, Taiwan.