Abstract
The coast of southern Chile near 46°S latitude was the location of the Ocean Drilling Program's Leg 141, which occupied five sites (859–863) from November 11, 1991, to January 13, 1992 (Figure 1). The Chile Rise spreading ridge, one segment of the globe‐circling, mid‐ocean‐ridge system, is being subducted beneath the Peru/Chile Trench convergent margin in this region. Three lithospheric plates are involved: The Antarctic Plate and the Nazca Plate are moving away from each other across the Chile Ridge extensional plate boundary, and the continental South American Plate is overriding both the Antarctic and the Nazca plates along the Peru/Chile Trench convergent plate margin. The Chile Margin Triple Junction exists where the three plates meet.
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