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Preliminary report, cruises L1-86-NC and L2-86-NC, Escanaba Trough, Gorda Ridge

Open-File Report 87-375-A

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Abstract

Eight large (up to 200 m across) and many small massive sulfide deposits were photographed and sampled at the sediment-covered Escanaba Trough, southern Gorda Ridge, during S.P. Lee cruises L1-86-NC and L2-86-NC in 1986. The deposits are associated with two volcanic edifices within the sedimentary fill along the axis of Escanaba Trough. The sulfide and other hydrothermal minerals are deposited on the seafloor as well as within the sedimentary section. High concentrations of Pb and As in some of the sulfide samples indicates significant interaction between hydrothermal fluids and sediment at depth.

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Preliminary report, cruises L1-86-NC and L2-86-NC, Escanaba Trough, Gorda Ridge
Series title:
Open-File Report
Series number:
87-375
Chapter:
A
Year Published:
1987
Language:
English
Publisher:
U.S. Geological Survey
Description:
20 p.