Abstract
The deposits which have been studied include the Blackstone, Temperley, and Teasdale mines. Most of the observations were made on sediment-ore-structure relationships. The ores lie in layers and breccia near, and in sag or basin structures at the base of the Quimbys Mill Member of the Platteville formation. The structure and bedding relationships of the contorted calcite and sphalerite bearing limestone layers show that the ores were present in the sediment during deformation. Geopetal and compaction features such as sphalerite nodules in carbonaceous limestones and the bulged ore layers further indicate a sedimentary and diagenetic formation for the ores.
Zusammenfassung
Die untersuchten Lagerstätten umfassen die Blackstone, die Temperley und die Teasdale Grube. Das Gewicht der Beobachtungen liegt auf den Sediment-Erz-Struktur-Verhältnissen. Die Erze liegen in Lagen und Brekzien neben und in Senkungen oder sack- bzw. beckenartigen Strukturen in dem unteren Teil des Quimbys Mill Member, der Platteville Formation. Das Gefüge der nach unten gebogenen Kalksteinschichten mit Kalkspat und Zinkblende in den Senkungs-Strukturen zeigt, daß die Erze während der Deformation schon in den Schichten vorhanden waren. Geopetale Erscheinungen, Stylolithe und Verdichtungstexturen wie Zinkblende-Knoten in kohlehaltigen Kalksteinen und die ausgebuchteten, linsenartigen Lagen weisen weiter auf eine sedimentäre und diagenetische Genese der Erze hin.
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Zimmermann, R.A. Sediment-ore-structure relations in barite and associated ores and sediments in the Upper Mississippi valley zinc-lead district near Shullsburg, Wisconsin. Mineral. Deposita 4, 248–259 (1969). https://doi.org/10.1007/BF00207128
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DOI: https://doi.org/10.1007/BF00207128