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doi:10.2204/iodp.proc.303306.209.2009

Introduction

Rock magnetic properties of marine sediments vary with changes in the abundance, type, and grain size of magnetic minerals. In general, magnetic minerals in marine sediments are either detrital or authigenic in origin. Stability of iron oxides and sulfides in marine sediments is susceptible to changing redox conditions in interstitial waters with burial depth. Therefore, the original magnetic signals recorded in the sediments are subject to postdepositional diagenetic alteration that could complicate paleomagnetic and paleoenvironmental interpretations (e.g., Karlin and Levi, 1983).

To test the possible effect of early diagenesis on magnetic signals in the sediments, we qualitatively identified magnetic mineral species by measuring magnetic properties in hemipelagic sediments recovered from Integrated Ocean Drilling Program (IODP) Expedition 303 Sites U1302–U1304 and U1308 in the North Atlantic (Fig. F1).

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