Clay mineralogy of Devonian shales in the Appalachian basin
Journal Article
·
· Geol. Surv. Open-File Rep. (U.S.); (United States)
OSTI ID:5236131
A study of the clay mineralogy of the Devonian black shales of the Appalachian basin was undertaken to help predict areas for potential gas resources. Illite (2m) recrystallized during diagenesis is more or less uniformly present throughout all shale units. Chlorite formed during low grade metamorphism is least abundant in the younger units and more abundant in the older units. Illite-smectite mixed-layer clay, which supplied the material for the formation of chlorite, is most abundant in the younger units and least abundant in the older units. Illite-chlorite mixed-layer clay occurs as a trace in all shale units. Kaolinite, the only unaltered detrital clay mineral, occurs in ca. 25 to 30% of the samples. The source of the kaolinite appears to have been to the east and northeast of the basin of deposition. The color of the shale units is primarily due to the organic content; however, those shales that contain calcite are darker than those that do not for equal amounts of organic carbon. 24 references.
- OSTI ID:
- 5236131
- Journal Information:
- Geol. Surv. Open-File Rep. (U.S.); (United States), Journal Name: Geol. Surv. Open-File Rep. (U.S.); (United States) Vol. 81-585; ISSN GSORD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
APPALACHIA
BITUMINOUS MATERIALS
BLACK SHALES
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CARBONATES
CHATTANOOGA FORMATION
CHLORITE MINERALS
CLAYS
DEVONIAN PERIOD
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
ILLITE
KAOLINITE
MATERIALS
MINERAL RESOURCES
MINERALOGY
MINERALS
NATURAL GAS DEPOSITS
NORTH AMERICA
OIL SHALES
OXYGEN COMPOUNDS
PALEOZOIC ERA
RESOURCES
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SMECTITE
USA
030200* -- Natural Gas-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
APPALACHIA
BITUMINOUS MATERIALS
BLACK SHALES
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CARBONATES
CHATTANOOGA FORMATION
CHLORITE MINERALS
CLAYS
DEVONIAN PERIOD
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
ILLITE
KAOLINITE
MATERIALS
MINERAL RESOURCES
MINERALOGY
MINERALS
NATURAL GAS DEPOSITS
NORTH AMERICA
OIL SHALES
OXYGEN COMPOUNDS
PALEOZOIC ERA
RESOURCES
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SMECTITE
USA