Regional and small scale features of cathodoluminescent zonation in hydrothermal dolomite from the Viburnum Trend, southeast Missouri, and northern Arkansas
A cathodoluminescent (CL) microstratigraphy in hydrothermal dolomite spanning the main stages of mineralization was defined in a 1985 study by R.L. Voss for the Viburnum Trend lead-zinc district, southeast Missouri. Our studies extend the CL microstratigraphy in hydrothermal dolomite from the Trend to samples in barren drill core 7 miles to the east, and 100 miles to the southwest in northern Arkansas. CL zonations in these samples are believed to be correlative with those in Viburnum Trend dolomites. Fluid inclusions in northern Arkansas hydrothermal dolomites yield temperatures and salinities similar to those of fluid inclusions in the Viburnum Trend. Regional correlation of CL and fluid inclusion observations indicates that hydrothermal fluid circulated throughout a vertically and laterally extensive portion of the stratigraphic section in southern Missouri and northern Arkansas. In the Bonneterre Formation of the Viburnum Trend, premineralization porosity of the host dolomite controlled the abundance of sparry dolomite exhibiting CL zonation; that abundance appears otherwise unrelated to the alteration facies known locally as brown rock and white rock. Episodes of dolomite dissolution not observable in plane polarized light occur throughout the CL microstratigraphy, but are most common in the zone contemporaneous with the main stages of mineralization. Dissolution textures within this zone are far more abundant near ore than in barren drill core from east of the Trend. The cyclic dissolution and precipitation of dolomite is believed to be related to fluctuations in pH associated locally with sulfide deposition.
- Research Organization:
- Geological Survey, Denver, CO (USA)
- OSTI ID:
- 6326845
- Report Number(s):
- CONF-8510489-
- Journal Information:
- Geol. Soc. Am., Abstr. Programs; (United States), Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Vol. 17; ISSN GAAPB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
152003* -- Geothermal Data & Theory-- Rock-Water-Gas Interactions
58 GEOSCIENCES
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
ARKANSAS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
DOLOMITE
ENERGY SYSTEMS
FEDERAL REGION VI
FEDERAL REGION VII
FLUIDS
GEOLOGY
GEOTHERMAL FLUIDS
GEOTHERMAL SYSTEMS
HYDROTHERMAL ALTERATION
HYDROTHERMAL SYNTHESIS
HYDROTHERMAL SYSTEMS
INCLUSIONS
LEAD ORES
LUMINESCENCE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALIZATION
MINERALOGY
MINERALS
MISSOURI
NORTH AMERICA
ORES
OXYGEN COMPOUNDS
PETROLOGY
PH VALUE
ROCK-FLUID INTERACTIONS
ROCKS
SALINITY
SEDIMENTARY ROCKS
STRATIGRAPHY
SULFIDE MINERALS
SYNTHESIS
TEMPERATURE MEASUREMENT
USA
ZINC ORES