Figure F32. Boreholes >200 m deep drilled into in situ ocean crust during DSDP, ODP, and IODP compared to Hole 1256D. Hole 504B is the only other basement hole to sample a complete extrusive sequence and penetrate into the sheeted dikes. ODP Hole 735B and IODP Hole U1309D, which drilled deep into gabbros tectonically exposed near ridge-transform intersections on the Southwest Indian and Mid-Atlantic Ridges, respectively, are shown for comparison. LP = lava pond, Inflate = inflated flows, Sheet and mass flows = sheet and massive flows, TZ = transition zone, Gb = gabbro. See Table T10 for description of and basis for these subdivisions.
Previous | Close | Next | Top of page