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The sediments of Deep Sea Drilling Project (DSDP) Hole 480 in the Guaymas Basin, Gulf of California (27°54.10'N, 111°39.34'W, 665 m water depth), consist of 152 meters of finely laminated diatomaceous ooze interstratified with mottled and homogeneous muds. At Site 480, the Serocki-Storms-Cameron hydraulic piston corer was used for the first time and obtained 80% of a virtually undisturbed sedimentary section (Curray et al., 1979). Because of a high sedimentation rate and an anaerobic, low-energy depositional environment underlying a seasonal upwelling regime (Schrader et al., 1980), the sediments of Site 480 offer an excellent opportunity to study the behavior of the geomagnetic field over the past few I0 years. In this chapter we present preliminary results of natural remanent magnetization (NRM) measurements of samples of varied lithology taken throughout the sedimentary section. In this first phase of our work, we examine the reliability of the magnetic recording in the different types of sediments and make a preliminary assessment of whether any significant paleomagnetic excursions were recorded at Site 480.

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Preliminary Paleomagnetic Results of Laminated Sediments from Deep Sea Drilling Project Hydraulic Piston Core Site 480, Guaymas Basin, Gulf of California