Abstract
Trace element abundances in sulfides of these two large hydrothermal ore districts allow distinction of several groups of ore bodies with differing trace element levels. Within groups, certain elements show lateral or vertical zoning. The groups were deposited from different batches of ore fluid. The differences in trace element content between groups reflect differences in stage of differentiation or abundance of complexing species when the ore fluid separated from the magma. The zoning may result from “hydrothermal differentiation” of a single batch of ore fluid as it travels away from the magma. The zoning pattern correlates in part with expected strength of metal complexes, but also depends on temperature and solid-liquid partition coefficients.
Zusammenfassung
Auf Grund der Spurenelementhäufigkeiten in Sulfiden können in diesen beiden großen hydrothermalen Erzvorkommen mehrere Gruppen von Erzlagerstätten unterschieden werden. Innerhalb der Gruppen zeigen gewisse Elemente laterale oder vertikale zonale Verteilungen. Die Gruppen wurden von verschiedenen erzbringenden Lösungen gebildet. Die Unterschiede im Spurenelementgehalt zwischen verschiedenen Gruppen spiegeln Unterschiede im Stadium der Differentiation oder die Häufigkeit von komplexbildenden Ionen während der Absonderung der erzbringenden Lösungen von Magma wider. Die zonale Verteilung kann von der „hydrothermalen Differentiation“ einer einzigen erzbringenden Lösung auf ihrem Weg vom Magma herrühren. Teilweise entspricht die zonale Spurenelementverteilung der erwarteten Stabilität von Metalionenkomplexen, sie hängt aber auch von der Temperatur und von Verteilungskoeffizienten zwischen festen und flüssigen Phasen ab.
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Contribution No. 69–34, College of Earth and Mineral Sciences, The Pennsylvania State University
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Rose, A.W. Origin of trace element distribution patterns in sulfides of the central and bingham districts, western U.S.A.. Mineral. Deposita 5, 157–163 (1970). https://doi.org/10.1007/BF00208059
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DOI: https://doi.org/10.1007/BF00208059