ZINC DEPOSITS RELATED TO DIAGENESIS AND INTRAKARSTIC SEDIMENTATION IN THE LOWER ORDOVICIAN ST. GEORGE FORMATION, WESTERN NEWFOUNDLAND.

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Collins, Jon A.
Smith, Leigh
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A detailed analysis was made of the geologic environments related to the Lower Ordovician carbonates hosting sphalerite mineralization near Daniel's Harbour, western Newfoundland. Sphalerite mineralization in the Lower Ordovician St. George Formation occurs in a white dolomite pseudobreccia confined to a unit of dolomite-mottled limestone and dolomite. This section is interbedded dolomite-mottled biointrapelsparite and dolomitized micrite deposited in two cyclically alternating epeiric environments. Two models for Zn precipitation can be suggested for the paleohydrologic system: 1) mobilization of 10 to 50 ppm Zn from host-rock carbonates by meteoric waters, and precipitation ″downstream″ at the interface with formation fluids; 2) precipitation of Zn by meteoric water dilution of upward-welling, Zn-rich formational chloride brines. Refs.
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页码:393 / 427
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