Magnetic properties of igneous rocks from Deep Sea Drilling Project Leg 63.

Abstract

We have measured several magnetic properties of igneaous rocks from Sites 469 through 473. The NRM intensity (Jn) ranges from 0.031 to 24.5X10-3 emu cm-3. Stable inclinations (I) are apparently obtainable for all sites except Site 473. ARM acquisition experiments show that the NRM of basalts from Site 470 may largely be the original TRM. Detailed VRM experiments do not confirm the conclusion of Lowrie and Kent (1975) that the VRM superposed on NRM can develop twice as rapidly as on a sample in the AF-demagnetized state. These experiments also show that the VRM component of the NRM of basalts from Sites 470 and 472 is quite small, whereas the samples from other sites (469, 471, and 473) are highly viscous. The diabases and basalts are distinguishable on the basis of several magnetic properties. The most useful parameters for this purpose seem to be Mr/Ms and Hcr/Hc ratios.-Authors