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Successful penetration into igneous basement was achieved by drilling at Site 396 (22°59'N, 43°31'W, Mid-Atlantic Ridge) in two holes, 396 and 396B, drilled respectively on Legs 45 (Melson, Rabinowitz, et al., in press) and 46 (Chapter 2, this volume). Hole 396 was the pilot hole for 396B. Total basement penetration in the pilot hole was 96 meters, expending a single bit. The two holes are 500 meters apart (Chapter 2, this volume), with 396 almost due south of 396B. Hole 396B was re-entered five times for a total basement penetration of 255 meters. Because the holes are so close to each other, it is of some interest to determine whether or not basalt types representing individual eruptive events can be correlated between them. This can give us some idea of the areal distribution of flows at one place on the Mid-Atlantic Ridge, although two holes admittedly are insufficient to resolve this question entirely. By combining chemical identification of basalt types in the two holes with the results of downhole paleomagnetic studies, we can also hopefully gain information about timing and frequency of eruptive events as well as structural modifications of the crust that are important to understand laterally as well as vertically.

Comparison of Chemical and Magnetic Stratigraphy of Holes 396 and 396B