Abstract
The Offset Spreading Center located between 12°52′ and 12°54′ N on the East Pacific Rise (Macdonald and Fox, 1983) has been studied in 1982 and 1984 with submersible Cyana and in 1983 with the deep towed vehicle Seamarc I. The two O.S.C. segments, about 1.5 km apart and 4 km in length, separated by a ‘depression’ (about 100 m in depth) show different volcano-tectonic settings. The Western Spreading Center (WSC) segment is characterised mainly by recent volcanic constructional features, while the Eastern Spreading Center (ESC) is highly fissured and consists essentially of older pillow-lava terrain. The intervening ‘depression’ located between the two segments is floored by small constructional mounds ( 0.2%), Na2O (>3%) and TiO2 (2%).
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