Resource Fotential of Hydrothermal Activity on the East Pacific Roc (8°N- 14°N)

摘要

Investigation of hydrothermal ore deposits on the East Pacific Rise (EPR) and on its off-axis volcanoes was carried out from 1985 to 1994 by the R/V Hakurei-maru No.2. More than one and a-half hundred hydrothermal activity sites were observed in the axial rift and on the off-axis volcanoes along the courses of the investigation. The hydrolhcrmal sites were clustered between 12°47' N and 12°51' N, and between 11°20' N and 11°36' N. Though some percentages of the sites were concentrated on the top of ridge and in the spreading center of the rift, the off-axis volcanoes arc considered as the most important area in the EPR from the view point of resource potential.