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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Factors controlling precious and base-metal enrichments at the ultramafic-hosted Logatchev hydrothermal field, 14°45′N on the MAR: New insights from cruise M60/3
verfasst von : S. Petersen, T. Kuhn, P. M. Herzig, M. D. Hannington
Erschienen in: Mineral Deposit Research: Meeting the Global Challenge
Verlag: Springer Berlin Heidelberg
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Massive sulfides from the Logatchev hydrothermal field are characterized by strong enrichments in Cu and Au (up to 56 wt. % Cu and 135 ppm Au) in secondary Cu-sulfides. Gold enrichment also occurs in porous, chalcopyrite-dominated chimney conduits that contain minor sphalerite as well as in oxidized sulfides from the mound surface. The presence of a strongly silicified caprock overlying Cu-Au-rich massive sulfides suggests that conductive cooling and/or mixing of hydrothermal fluids and seawater are responsible for at least some of the Au and Cu enrichment. Sulfur isotope ratios provide further evidence for the interaction of hydrothermal fluids and oxidized seawater in the formation of the secondary sulfides.