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Meeting Abstracts American Geophysical Union

Paleomagnetic Results From IODP Exp. 306:
Shipboard and Preliminary Post-Cruise Studies

Guyodo, Y - LSCE, Campus du CNRS, Gif-sur-Yvette, 91198 France
Ohno, M - Grad. School of Social and Cultural Studies, Kyushu Univ., Chuo-ku, 810-8560 Japan
Acton, G - Dept. of Geology, Univ. of California Davis, Davis, CA 95616 USA
Evans, H - Dept. of Geological Sciences, Univ. of Florida, Gainesville, FL 32611 USA
Kanamatsu, T - Deep Sea Research Dept., JAMSTEC, Yokosuka, 236-0061 Japan

Oceanic sediments recovered during Integrated Ocean Drilling Program (IODP) Expedition 306 provided high-resolutionpaleomagnetic records, which helped in the construction of the shipboard composite sections and time scales. Sites U1312(42°50'N, 23°05'W, 1-6 cm/ky) and U1313 (41°N, 32°57'W, 4-5 cm/ky) are located near the Azores Islandsand possess lithologies dominated by nannofossil oozes. Site U1314 (56°22'N, 27°53'W, 7-11 cm/ky) is located onthe southern Gardar Drift and is characterized primarily by nannofossil- and clay-rich sediments. Multiple coring was doneusing the advanced piston corer (APC) system. At Site U1312, magnetic polarity intervals were clearly identified down to the Gauss/Gilbert transition. Data are noisier down-core, but the bottom of the sequence was tentatively identified as Chron5n. At Site U1313, a clear magnetic polarity record was obtained down to the Gauss. Data are noisier below this interval,but a magnetostratigraphy was defined down to Chron 3An.1n. At Site U1314, a detailed magnetostratigraphy, including several short geomagnetic intervals, was established down to the upper part of the Gauss. The high data quality suggests thatpost-cruise investigations will provide interesting new results. A comparison with preliminary u-channel data will bepresented.

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