Abstract
Understanding the origin of the ocean crust by scientific drilling at the axes of mid‐ocean ridges is a high priority in the Earth science community, as reflected in the Ocean Drilling Program (ODP) Long Range Plan, the Joint Oceanographic Institutions for Deep Earth Sampling (JOIDES) Lithosphere Panel's White Paper, and several reports of the Ridge Inter‐Disciplinary Global Experiments (RIDGE) program. The ODP Long Range Plan provides for over a dozen drilling legs at and near mid‐ocean ridges prior to the year 2002, including a multileg drilling program at the East Pacific Rise (EPR).ODP Leg 142 (February–March 1992) was the first of this multi‐leg effort and was devoted primarily to continued testing and development of the engineering systems needed for successful drilling of bare rock at mid‐ocean ridges. At the same time, it was hoped that drilling would result in cores that could be used to study volcanic and hydrothermal processes, volcanic architecture, fluid flow, and other processes occurring at the active EPR axis.
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