Geochemistry of ore-forming hydrothermal fluids of the world ocean
- 1 — National Mineral Resources University (Mining University)
- 2 — National Mineral Resources University (Mining University)
Abstract
The most complete results of the study of hydrothermal ore-forming solutions geochemistry in the Russian and international expeditions to deep-sea hydrothermal fields of the world ocean are analyzed. Solutions of both high and low salinity with respect to seawater are formed in the discharge zone of fluids. Positive correlation of ore components with the chloride ion and negative one with the pH value may indicate the migration of components in acidic hydrothermal solutions in the form of chloride complexes. Hydrogen sulfide is associated with the significant positive correlation with metals, which indicates reducing conditions forming in ore-bearing hydrothermal solutions. This is confirmed by the close relationship of ore components with hydrogen. The transfer of metals mainly in the form of chloride complexes at high temperatures of the solution is confirmed by the results of our thermodynamic modeling. Methane is characterized by negative dependence on temperature and concentration of ore components, associated with positive dependence on pH and negative one on hydrogen sulfide. Each of the observed dependencies can testify against abiotic theory of income of methane in hydrothermal solutions. The following geochemical indicators are the most promising for the discovery of new ore deposits and the organization of geochemical monitoring during the development of already discovered fields: Eh, pH, Cl, Fe, Mn, H 2 S, CO 2 , H 2 and possibly CH 4 .
References
- Бутузова Г.Ю. Гидротермально-осадочное рудообразование в рифтовой зоне Красного моря. М.: ГЕОС, 1998. 312 с.
- Гидротермальные сульфидные руды и металлоносные осадки океана / Под ред. И.С.Грамберга. СПб: Недра, 1992. 278 с.
- Гурвич Е.Г. Металлоносные осадки Мирового океана. М.: Научный мир, 1998. 200 c.
- Рона П. Гидротермальная минерализация областей спрединга в океане. М.: Мир, 1986. 159 с.
- Судариков С.М. Гидроминеральные проявления в Океане // Геодинамика и рудогенез Мирового океана / Под ред. И.С.Грамберга. ВНИИОкеангеология. СПб, 1999. C.62-72.
- Судариков С.М. Формирование состава гидротермальных растворов в гидрогеологических массивах ультра-основных пород Срединно-Атлантического хребта / С.М.Судариков, М.В.Кривицкая // Записки Горного института. 2011. Т.189. C.68-71.
- Bischoff J.L. Liquid-Vapor Relations for the system NaCl–H2O: Summary of the P-T-x Surface from 300 to 500 C / J.L.Bischoff, K.S.Pitzer // Am. J. Sci. 1989. Vol.289. P.217-289.
- Charlou J.L. Hydrothermal Fluid Geochemistry / J.L.Charlou, J.P.Donval, S.M.Sudarikov // Serpentine Cruise Scientific Report. Feb. 25 to Avr. 5, R/V Pourquoi Pas? ROV Victor. 2007. P.185-189.
- Charlou J.L. High Production and Fluxes of H2 and CH4 and Evidence of Abiotic Hydrocarbon Synthesis by Ser-pentinization in Ultramafic-Hosted Hydrothermal Systems on the Mid-Atlantic Ridge / J.L.Charlou, J.P.Donval, C.Konn, H.Ondreas, Y.Fouquet // Diversity of Hydrothermal Systems on Slow Spreading Ocean Ridges: Geophysical Monograph Series 188. American Geophysical Union. 2010. P.265-295.
- Ladolam gold deposit, Lihir Island / A.L.Moyle, B.J.Doyle, H.Hoogvliet et al. // Geology of the mineral deposits of Australia and Papua New Guinea / Editor F.E.Hughes. Melburne, Australasian Institute of Mining and Metallurgy, monograph series, 1990. Vol.2. N 2. Р.1793-1805.
- Mineral Resource Estimate Solwara Project, Bismarck Sea, PNG // Technical Report. 2012. N I. P.43-101.
- Mottl M.J. Metabasalts, axial hot springs and the structure of hydrothermal systems at mid-ocean ridges // Geol. Soc. Amer. Bull. 1983. Vol.94. N 2. P.161-180.
- Mottl M.J. VentDB: Mid-Ocean Ridge Hydrothermal Vent Chemistry Data Collection in the EarthChem Library. 2012. http://earthchem.org/featured/mott
- Submarine Gold Mineralization Near Lihir Island, New Ireland Fore-Arc, Papua New Guinea / S.Petersen, P.M.Herzig, M.D.Hannington et al. // Economic Geology. 2002. Vol.97. N 8. P.1795-1813.
- Usui А. Marine Polimetallic Mineral Deposits in the vicinity of the Japanese Islands. NorthWestern Pacific. Map scale 1 : 7 000 000. Tokyo, Geol. Survey of Japan, 1994.
- Von Damm K. Seafloor hydrothermal activity: black smoker chemistry and chimneys // Annu. Rev. Earth Planet. Sci. 1990. Vol.18. P.173-204.