Paragenesis, Mineralization, and Hydrocarbon Emplacement in the Trenton/Black River Group in Central Kentucky

Warren H. AndersonKentucky Geological Survey

TRENTON WORKSHOPJune 4, 2002Lexington, Ky.

Hydrothermal Mineral ActivityPre-mineralization events

Shearing, Faulting

MineralizationBase metal mineralization

including dolomiteIgneous component

Post-mineralization eventsFaulting, Gypsum

Dolomitization?Early post-diagenetic or hydrothermal

Applications to the Central MidcontinentEach district or mine is unique

Complex Parameters

1. Physical-chemical2. Fluid-gas interaction3. Pressure-temperature4. Salinity-concentrations-pH4. Age and timing5. Varience in Trenton lithlogy

Tectonic Features Map

Bitumen

Walker

Trinity Church

Field Stop

Quarry

Caldwell Stone

Lexington Quarry

Walker

Trinity Church

Field Stop

Quarry

Caldwell Stone

Lexington Quarry

Walker

Trinity Church

Field Stop

Quarry

Caldwell Stone

Lexington Quarry

, Nuttall, 95

Walker

Trinity Church

Field Stop

Quarry

Caldwell Stone

Lexington Quarry

Conclusions

HydrothermalDolomitization vs. MineralizationLate-stage pathfinder mineralsLate-stage fluids=dolomitization

less saline, cooler?