Sphalerite from transgressive and regressive sediments of the Cambro-Silurian supercycle, Baltic Shield

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Abstract
A sedimentary micro-vent in Lower Cambrian sandstone, and spar filled cephalopod shells in uppermost Wenlockian barite and dolomite carrying silty pelmicrosparite contain well-developed macroscopic ZnS0mineralization and very little pyrite. As controlling factors are suggested, good permeability, avail- ability in underlying sediment of finely dispersed organic matter with sorbed Zn, and low s2-- activity in the percolating water. Sedimentation was temporarily rather rapid.

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