Gorda Ridge: A Seafloor Spreading Center in the United by Martin R. Fisk, Katherine J. Howard (auth.), Dr. Gregory R.

By Martin R. Fisk, Katherine J. Howard (auth.), Dr. Gregory R. McMurray (eds.)

Gorda Ridge provides a basically technical precis of modern advances in seafloor study regarding mineral exploration of the single seafloor spreading heart in the usa' unique monetary sector (EEZ). Spreading facilities are identified to be the locus of hydrothermal job and to host mineral deposits of hydrothermal starting place. The booklet comprises sections at the result of mineral exploration on Gorda Ridge, the latest applied sciences for mineral exploration and sampling at the seafloor, and the evolving box of hydrothermal vent biology and ecology. What makes the e-book detailed is that it really is: 1) a domain ebook, 2) a very multidisciplinary summation of the cutting-edge in complementary components of deep ocean geology and biology, and three) a marker within the evolution of federal-state kinfolk bearing on ocean development.

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Additional info for Gorda Ridge: A Seafloor Spreading Center in the United States’ Exclusive Economic Zone

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S. Geological Survey cruise L5-85-NC whereas those indicated by 86-xx are from cruise L3-86-NC. Gravity cores are designated by a G. 3 are indicated. Dredge L5-85-NC-D45 is located in the axial valley just south of the mapped area. from Narrowgate was investigated to relate the water column anomalies to hydrothermal vents, associated mineralization, and tectonic and volcanic features (Fig. 2). The bathymetry is based on NOAA multibeam surveys (Malahoff, 1985; Rona and Clague, 1989). Bathymetric profiles across the rift valley in the GR14 area exhibit a series of four steplike terraces cumulatively rising about 800 m between the floor of the rift valley and the rift mountain crests on either side (Fig.

Detailed sections through the plume at GR14 demonstrated dimensions of at least 2 km (east-west) and 2 to 4 km (north-south), centered over the east wall of the axial valley. The plumes at GR14 and GR15 were not physically connected along the ridge axis. Chemical anomalies in the plumes included high concentrations of dissolved manganese, helium-3, radon-222, and iron-rich hydrothermal precipitates. The composition and hydrography of the plumes suggest that they originated from high-temperature vents.

Detrick R, Buhl P, Vera E, et al. (1987) Multichan- Morton JL, Holmes ML, Koski RA (1987) Volcanel seismic imaging of a crustal magma chamber nism and massive sulfide formation at a sedimented spreading center, Escanaba Trough, Goralong the East Pacific Rise. Nature 326:35-41. EEZ-Scan 1984 Scientific Staff (1986) Atlas of the da Ridge, northeast Pacific Ocean. Geophys Res Lett 14:769-772. S. Geological Survey Miscel- Nelsen TA, Iricanin N, Trefry JH (1987) Suspended laneous Investigations Ser 1-1792: 152 p.

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