Abstract
Branching, pipe-like, quartz-rich molybdenite-wolframite-bismuth pipes occur within the altered margin and roof zone of a Permian high level leucoadamellite. The alteration was predominately a base-leaching process at low temperatures and pressures less than 0.3 kb. Decreasing pH of base-leaching solutions away from the pipes produced major element zoning around the pipes. The pipes are partly located in joints and show an internal zoning of the ore minerals.
Zusammenfassung
In der chemisch veränderten Randzone eines permischen Adamellits, der vermutlich teilweise im tektonischen Verband mit seinem Rahmen steht, treten sich verzweigende, röhrenförmige quarzreiche Molybdänglanz-Wolframit-Wismuth-Gänge auf. Die chemische Veränderung beruht überwiegend auf einem Auslaugungsprozeß bei niederen Temperaturen und Drucken unter 0,3 kb. Ein allmähliches Absinken des pH-Wertes der Lösungen mit zunehmender Entfernung von den „pipes“ verursachte eine zonale Verteilung der Hauptelemente. Die „pipes“ sind zum Teil an Klüfte gebunden und zeigen eine interne zonale Anordnung der Erzminerale.
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Plimer, I.R. Pipe-like molybdenite-wolframite-bismuth deposits of wolfram camp, North Queensland, Australia. Mineral. Deposita 9, 95–104 (1974). https://doi.org/10.1007/BF00207967
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DOI: https://doi.org/10.1007/BF00207967