Submersible observations at the axis of the ultra-fast-spreading East Pacific Rise (17°30' to 21°30'S)

Details Submersible observations at the axis of the ultra-fast-spreading East Pacific Rise (17°30' to 21°30'S) Submersible observations at the axis of the ultra-fast-spreading East Pacific Rise (17°30' to 21°30'S)

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..75..339r&link_type=abstract

Earth and Planetary Science Letters, Volume 75, Issue 4, p. 339-353.

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60

Scientific paper

Manned submersible observations conducted with the diving saucer ``Cyana'' at the axis of the East Pacific Rise at four sites near 21°30', 21°10', 18°30' and 17°30'S demonstrate that the ridge evolves between two end-members. The volcanic end-member is characterized by a non-rifted or only slightly rifted topographic ridge with widespread but diffuse water venting. The tectonic end-member is marked by a well defined axial graben whose floor can be the locus of intense sulfide deposition. At one site, a small stockwork mineralization exposed through normal faulting was observed at the base of the graben wall. The dives illustrate the discontinuous nature of volcanic, tectonic and hydrothermal activities even in the case of the fastest accretion found in the ocean.

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