期刊
MINERALOGY AND PETROLOGY
卷 96, 期 1-2, 页码 1-18出版社
SPRINGER WIEN
DOI: 10.1007/s00710-008-0038-x
关键词
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资金
- National Science Foundation [NSF-INT-9729653, NSF-EAR-0106388]
- American Chemical Society [PRF 35893-AC8]
- University of Missouri Research Board [RB00-117]
- University of Missouri MAGEP program
- Society of Economic Geologists
- Geological Society of America [6259-98]
- American Association of Petroleum Geologists
- Jefferson Smurfitt Corporation
- BHP Ltd
- Enterprise Ireland (Forbairt)
This study provides a regional framework within which studies of ore-related dolomite and dolomite cements may be placed. Fluid inclusion data indicate the presence of three distinct fluids following early dolomitization: 1) a ubiquitous low-temperature, higher salinity fluid found in saddle dolomite; 2) a low-temperature, lower salinity fluid limited to sub-Waulsortian and Waulsortian carbonates; and 3) a higher temperature, lower salinity fluid found in Waulsortian and supra-Waulsortian rocks. Similar fluids have been reported in ore-associated minerals and postmineralization dolomite (Type 1) and in ore-stage carbonates and sphalerite (Types 2 and 3). The halogen geochemistry of included fluids indicates genesis from evaporated seawater. Type 1 fluids are enriched in chloride relative to bromide, reflecting a component of salinity derived via dissolution of halite or from dehydration of seawater. These data suggest that dolomitization and mineralization of Mississippian rocks in the Midlands requires both regionally extensive and localized fluid flow.
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