Abstract
An efficient transport and a local accumulation of the ore metals is controlled by: 1. availability of water, 2. availability of metals and sulfur, 3. availability of compounds forming complexes with ore metals (chloride, bisulfide), 4. existence of channels and driving forces, 5. existence of steep geothermal gradients or solutions which cause ore precipitation. A concentration of metals at and above 1 ppm must be achieved in ore solutions (information from recent ore brines, fluid inclusions and solubility data of ore and gangue minerals). The availability of complexing chloride has been estimated from data on metamorphic and granitic rocks. Certain ore deposits can be correlated with magmatic, sedimentary or both sources by their lead isotope data.
Zusammenfassung
Transport und lokale Anreicherung von Erzmetallen werden durch folgende Faktoren kontrolliert: 1. das Vorhandensein von Wasser, 2. das Vorhandensein von Metallen und Schwefel, 3. das Vorhandensein von Verbindungen, die mit den Erzmetallen Komplexe eingehen (Chloride, Bisulfide), 4. das Vorhandensein von Kanälen für die Lösungen und von treibenden Kräften, 5. die Existenz von steilen geothermischen Gradienten oder Lösungen, die eine Erzausfällung bewirken. In Erzlösungen muß eine Metallkonzentration von etwa 1 ppm oder darüber erreicht werden (Ergebnisse von rezenten, metallreichen Solen, Flüssigkeitseinschlüssen und Löslichkeitsdaten von Erz- und Gangmineralen). Auf das Vorhandensein komplexierender Chloride wurde aus Daten von metamorphen und granitischen Gesteinen geschlossen. Bestimmte Erzlagerstätten können auf Grund ihrer Blei-Isotopen magmatischer oder/und sedimentärer Herkunft sein.
„Geochemische Grunddaten von Zn, Pb und Cu und hydrothermale Erzentstehung“
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Wedepohl, K.H. (1974). Basic Geochemical Data of Zn, Pb and Cu and Hydrothermal Ore Genesis. In: Petrascheck, W.E. (eds) Metallogenetische und Geochemische Provinzen / Metallogenetic and Geochemical Provinces. Österreichische Akademie der Wissenschaften Schriftenreihe der Erdwissenschaftlichen Kommission, vol 1. Springer, Vienna. https://doi.org/10.1007/978-3-7091-4065-9_14
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