Summary of magnetic observations, Leg 49.

Abstract

In this chapter, we will summarize the combined observations on paleomagnetism, rock magnetism, magnetochemistry, and opaque microscopy of these samples. Many of our conclusions are in agreement with previous studies of oceanic basalts (see Legs 34, 37 and 45, for example). In general, we find low intensities (about 5 x 10-3G) of remanence (NRM), implying that the source of the magnetic anomaly patterns of the oceans has to be much deeper than our deepest penetrations into basalt (maximum = 230m). This is the same conclusion reached by Ryall et al. (1977) from a study of nearly 600m of oceanic crust cored on Leg 37.-Authors