Trace element systematics of pyrite from submarine hydrothermal vents
Keith M, Häckel F, Haase K, Schwarz-Schampera U, Klemd R (2016)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2016
Journal
Publisher: Elsevier
Book Volume: 72
Pages Range: 728-745
DOI: 10.1016/j.oregeorev.2015.07.012
Abstract
Submarine hydrothermal sulfide ores occur at mid-ocean ridges, intra-oceanic arcs and in back-arc basins associated with host rocks of highly variable composition. Pyrite is the dominant sulfide mineral in most samples presented within this study, and thus the trace element composition of pyrite may reflect the different metal sources and precipitation processes. Here, we report on a systematic study of minor and trace element contents in pyrite from active and inactive submarine hydrothermal vent fields at different plate-tectonic settings including the Indian and Mid-Atlantic Ridges, the Tonga-Kermadec intra-oceanic arc, the Lau back-arc and the central Okinawa Trough. Our results show that the trace element contents of pyrite from different locations vary significantly but for most elements without any systematic correlation to the concentration in the magmatic host rocks. Only As appears to be depleted in pyrite from ultramafic-hosted vent systems that are affected by serpentinization. These As depleted pyrites preferentially host Au micro- or nano-particles. Bismuth is enriched in pyrite from hydrothermal systems that contain a sedimentary component and micro-inclusions of sphalerite are either due to fluid-sediment interaction or phase-separated fluid venting. Pyrites from individual locations have highly variable concentrations of elements like Au, Co, Cu, Se, Mo, Ag and Sb that are most likely related to fluid evolution and changes in fluid composition. Sub-seafloor hydrothermal fluid-seawater mixing influences the distribution of Au, Co, Cu, Se and Mo in pyrite. Elements like Au, Ag, Sb and Pb often have a characteristic affinity to As, while Cd correlates closely with Zn. A magmatic volatile contribution to the Hine Hina hydrothermal system may result in the precipitation of Cu-enriched pyrite. Our results show that the concentrations of most trace metals in pyrite are a function of the physicochemical parameters of the fluid phase rather than a reflection of the magmatic host rock composition.
Authors with CRIS profile
Manuel Keith
Lehrstuhl für Endogene Geodynamik
Florian Häckel
Lehrstuhl für Endogene Geodynamik
Karsten Haase
Lehrstuhl für Endogene Geodynamik
Reiner Klemd
Professur für Geochemie von Lagerstätten
Related research project(s)
Involved external institutions
Germany (DE)How to cite
APA:
Keith, M., Häckel, F., Haase, K., Schwarz-Schampera, U., & Klemd, R. (2016). Trace element systematics of pyrite from submarine hydrothermal vents. Ore Geology Reviews, 72, 728-745. https://dx.doi.org/10.1016/j.oregeorev.2015.07.012
MLA:
Keith, Manuel, et al. "Trace element systematics of pyrite from submarine hydrothermal vents." Ore Geology Reviews 72 (2016): 728-745.
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