Figure F90. Lower hemisphere stereographic projection of poles to alteration veins and brittle shear zones measured in the core reference frame and rotated using the measured paleomagnetic declination back to a common orientation as described in "Structures in Peridotite and Gabbroic Intrusions," in "Mantle Upwelling, Melt Transport, and Igneous Crustal Accretion" in the "Leg 209 Summary" chapter. It was assumed that samples from these holes record normal polarity magnetization. A. Hole 1270C. (Continued on next page.)

Figure F90. Lower hemisphere stereographic projection of poles to alteration veins and brittle shear zones measured in the core reference frame and rotated using the measured paleomagnetic declination back to a common orientation as described in "Structures in Peridotite and Gabbroic Intrusions" in "Mantle Upwelling, Melt Transport, and Igneous Crustal Accretion" in the "Leg 209 Summary" chapter. It was assumed that samples from these holes record normal polarity magnetization. A. Hole 1270C. B. Hole 1270D.