Unconformity-sourced aquifer cements and later burial cements, Mississippian limestone, Kentucky and Virginia

Conference · Tue Jan 01 04:00:00 EST 1985 · Geol. Soc. Am., Abstr. Programs; (United States)

OSTI ID:6198850

Nelson, A; Read, J F

The Mississippian Newman Limestone in eastern Kentucky contains aquifer-related cements and deeper burial cements with recharge areas dominated by non-luminescent (low Fe and Mn) cement. The Newman Limestone thickens to the southeast into the basin. Here, early diagenesis includes compaction resulting in mechanical porosity reduction and some grain fracturing; at the same time aragonite grains were undergoing leaching from aragonite undersaturated, reducing aquifer water, distal from recharge areas. This was followed by precipitation of low-iron, dully luminescent calcite coeval with leaching of high-Mg skeletal grains by reducing aquifer waters. Shallow burial cementation is minor with porosity reduction related to deeper cementation from basinal pore fluids. With increasing burial further compaction caused spalling of ooid cortices and there was precipitation of Fe-rich saddle dolomite, in part coeval with moderate Fe-rich calcite cementation, filling inter and intra particle pores and fractures; these cements precipitated from basinal fluids. At or near deepest burial, Fe-rich calcite precipitated in much of the remaining void space. Porous reservoir dolomite shows incomplete cementation by this stage. During uplift of the sequence late calcite cements with low Fe contents were precipitated from more oxidizing fluids sourced from Cenozoic land surfaces. Iron calcites have intermediate delta/sup 18/O values between marine and aquifer calcite values, reflecting increased temperature and the contribution of marine carbonate.

• Research Organization: Virginia Polytechnic Institute and State Univ., Blacksburg (USA)
• OSTI ID: 6198850
• Report Number(s): CONF-8510489-
• Conference Information: Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
AQUIFERS
ARAGONITE
BUILDING MATERIALS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CEMENTS
DIAGENESIS
FEDERAL REGION III
FEDERAL REGION IV
GEOLOGIC AGES
GEOLOGIC HISTORY
KENTUCKY
LIMESTONE
MATERIALS
MINERALS
MISSISSIPPIAN PERIOD
NORTH AMERICA
OXYGEN COMPOUNDS
PALEOZOIC ERA
POROSITY
PRECIPITATION
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
USA
VIRGINIA