Abstract

Zinc occurs in low-iron sphalerite associated with gangue dolomite in dissolution breccias and collapse structures in dolomitized limestone and interbedded fine-grained "primary' dolomite. These breccias and collapse structures were developed as part of a karst-sinkhole complex formed at depths up to 800 feet below the top of the Knox Dolomite during widespread emergence at the end of Early Ordovician time. Mineralization was completed before the rocks were tilted, and clearly antedates the Appalachian orogeny. Source of hydrothermal solutions is not known.

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