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Leg 36 started in Ushuaia, Argentina, on 4 April 1974 and finished in Rio de Janeiro, Brazil, on 22 May 1974. It completed the second of three austral summer seasons of drilling planned for Antarctic waters during Phase III of the Deep Sea Drilling Project. In fact Leg 36 brought the Antarctic drilling program of Phase III to an end, because the plan to drill south of Africa during the austral summer of 1974-75 had to be abandoned for want of a suitable escort vessel. The two main objectives of Leg 36 as originally conceived by the Antarctic Advisory Panel were to investigate the geologic histories of the Scotia Arc and of the Argentine Basin. Weather conditions and icebergs forced complete mid-cruise modifications of the Leg 36 scientific program as originally planned. They even played havoc with the modified program so that only 2 of the 10 holes spudded were voluntarily abandoned with all the scientific objectives achieved. The cruise track and site locations are shown in Figure 1. Despite the problems we drilled 10 holes at six sites with a total penetration of 2481 meters and recovered 580 meters of 1007 meters cored (57.6% recovery). Data from four of the sites—327, 329, and 330 on the Falkland (Malvinas) Plateau and 328 in the Malvinas Outer Basin—constitute a major contribution to knowledge of the tectonic and oceanographic evolution of the southernmost Atlantic Ocean Basin (Table 1).

Evolution of the Southwestern Atlantic Ocean Basin: Results of Leg 36, Deep Sea Drilling Project