Data report: magnetic properties of unconsolidated deep-sea sediments from the North Atlantic, IODP Expedition 303 Sites U1302-U1304 and U1308: Expedition 303

Abstract

Magnetic properties were measured on unconsolidated deep-sea sediments from Integrated Ocean Drilling Program Expedition 303 Sites U1302–U1304 and U1308 in the North Atlantic. Our results indicate general correspondences between rock magnetic parameters (i.e., remanent magnetization, low-field mass specific magnetic susceptibility, anhysteretic remanent magnetization, saturation remanent magnetization, and saturation magnetization) and visual core description–based lithology. Most magnetic grains in the sediments are in the pseudosingle-domain region, whereas magnetic grains in laminated diatom ooze at Site U1304 are in the multidomain region. Results of thermomagnetometry imply that the magnetic carrier in sediments at Sites U1302 and U1303 and at 20.9 meters composite depth (mcd) at Site U1308 is constituted by magnetite. On the other hand, maghemitized magnetite constitutes the magnetic carrier in sediments at Site U1304 and the upper 20.9 mcd of Site U1308.