Minerals Report - International Seabed Authority
Minerals Report - International Seabed Authority Minerals Report - International Seabed Authority
Based on the potential resources contained in these deposits, they are considered to be medium – large, with tonnage estimates between 5 to 50 million tonnes, and with the highest potential in the eastern flanges of the slope of the valley. The ages of the sulphides samples from the Logachev- 1 site range from about 10-60,000 years (Lalou et al., 1996). Logachev - hydrothermal field (Figure 4) The Logachev - 2 hydrothermal field was discovered in 1993-94 at the same time as the Logachev-1 field. The Logachev – 2 field is 5,500 kilometres southwest of it, and was studied in detail during 1996 and 1997 on the 16 th cruise of the R/V Professor Logachev. The field is located between 2660metres and 2700 metres depth in the same geologic setting as Logachev - 1. The host rocks at this deposit are also gabbro-peridotites. Modern volcanic activity is not observed, but 6 sulphides mounds with diameters of up to 120 metres, and surrounded by a field of metalliferous sediments are revealed within its limits. The sulphides contain 7.5 - 22.5% copper, 0.19 - 1.58% zinc and 0.23 - 10.1 g/t gold. Unique for massive sulphides were the contents of valuable components that were recovered in a large bulk sample collected by T/V equipped grab. These included 20.5% copper, 21.2% zinc and 424-ppm gold; in this case the content of gold in particular large-volume samples varies from about 101.1 to 875.1 ppm. It has been suggested that the mineralisation that has been determined in the Logachev hydrothermal field represents a new type of sulphides mineralisation that differs from the earlier types that have been studied. This mineralisation is characterized by a peculiar composition and genesis that is related to the deep recycling and serpentinisation processes (Bogdanov, 1997). INTERNATIONAL SEABED AUTHORITY 180
Figure 4 INTERNATIONAL SEABED AUTHORITY 181
- Page 138 and 139: 60 kg Au) located on the neighbouri
- Page 140 and 141: 9. Perspective If further explorati
- Page 142 and 143: 3. J.M. Franklin, J.W. Lydon, and D
- Page 144 and 145: 19. R.A. Zierenberg, Y. Fouquet, D.
- Page 146 and 147: 35. J. Collier, M. Sinha (1990), Se
- Page 148 and 149: 53. P.M. Herzig, Y. Fouquet, M.D. H
- Page 150 and 151: 68. M.D. Hannington, J.M. Peter, an
- Page 152 and 153: 85. The New York Times (1997), Firs
- Page 154 and 155: southern segment is a fast-spreadin
- Page 156 and 157: Professor Herzig said that the spec
- Page 158 and 159: Professor Herzig said that the depo
- Page 160 and 161: Professor Herzig informed participa
- Page 162 and 163: he informed participants that in ad
- Page 164 and 165: In relation to Conical Seamount, Pr
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- Page 168 and 169: would be removed from the deposit.
- Page 170 and 171: CHAPTER 3 REGIONAL AND LOCAL VARIAB
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- Page 174 and 175: A digital map of ore-bearing region
- Page 176 and 177: of the slopes in between 1500-3000m
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- Page 180 and 181: Regarding the formation of the firs
- Page 182 and 183: SUMMARY OF THE PRESENTATION AND DIS
- Page 184 and 185: the Juan-de-Fuca Ridge, the Guaymas
- Page 186 and 187: Intensive investigations resulted i
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- Page 192 and 193: Generally, the massive sulphides or
- Page 194 and 195: With regard to the gold values repo
- Page 196 and 197: CHAPTER 5 COBALT-RICH FERROMANGANES
- Page 198 and 199: Current patterns, topography, botto
- Page 200 and 201: Table 1: Contents of manganese, iro
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- Page 204 and 205: Depth (km) 0 100 200 0 1 2 3 4 5 O
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- Page 210 and 211: today. Field studies by the USA, Ge
- Page 212 and 213: Phosphorite and fresh basalt are st
- Page 214 and 215: 3.2. Mineralogy The mineralogy of b
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- Page 218 and 219: 3.4. Chemical Composition All USGS
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- Page 222 and 223: Sample/PAAS 100 10 1 0.1 0.01 0.001
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- Page 228 and 229: Phosphatization of the older Fe-Mn
- Page 230 and 231: A. B. C. Mn FSM-Palau Marshall Isla
- Page 232 and 233: 4. Iron-Manganese Crust Formation E
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Figure 4<br />
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