Trace element systematics of pyrite from submarine hydrothermal vents

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Keith M, Häckel F, Haase K, Schwarz-Schampera U, Klemd R
Zeitschrift: Ore Geology Reviews
Verlag: Elsevier
Jahr der Veröffentlichung: 2016
Band: 72
Seitenbereich: 728-745
ISSN: 0169-1368
Sprache: Englisch


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.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Haase, Karsten Prof. Dr.
Lehrstuhl für Endogene Geodynamik
Häckel, Florian
Lehrstuhl für Endogene Geodynamik
Keith, Manuel Dr.
Lehrstuhl für Endogene Geodynamik
Klemd, Reiner Prof. Dr.
Professur für Geochemie und Lagerstättenkunde


Einrichtungen weiterer Autorinnen und Autoren

Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)


Zitierweisen

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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