Geologic features that influenced coalbed thicknesses in the eastern part of the Illinois Basin
Thesis/Dissertation
·
OSTI ID:6918223
In the east-central part of the Illinois Basin, mappable thickness of coalbeds vary by several hundred percent (from less than 3 feet to more than 6 feet) across distances ranging from a few hundred feet to several hundred miles. The formation of Middle Pennsylvanian coalbeds in that area was affected by the La Salle Anticlinal Belt, by contemporaneous deposition of linear sandstones, and by differential volumetric changes around underlying features. These underlying features include earlier Middle Pennsylvanian linear sandstones (75 to 150 feed deeper), Lower Pennsylvanian sandstones filling paleovalleys of the Mississippian-Pennsylvanian unconformity (300 to 700 feet deeper), embayments and passes of a Silurian reefs. These influences interacted to produce abnormally thick (greater than 4.5 feet) deposits of the Seelyville, Survant, Springfield, and Hymera Coal Members (Pennsylvanian) within three geographically restricted areas (mining districts) in west-central Indiana. The intermittent influence of preexisting features on Middle Pennsylvanian deposition indicates that significant depositional hiatuses occurred during Middle Pennsylvanian time.
- Research Organization:
- Indiana Univ., Bloomington, IN (USA)
- OSTI ID:
- 6918223
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
011000* -- Coal
Lignite
& Peat-- Reserves
Geology
& Exploration
CARBONATE ROCKS
CARBONIFEROUS PERIOD
COAL DEPOSITS
COAL SEAMS
DEPOSITION
DEPTH
DIMENSIONS
FEDERAL REGION V
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
ILLINOIS BASIN
INDIANA
MINERAL RESOURCES
NORTH AMERICA
PALEOZOIC ERA
REEFS
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
THICKNESS
USA
VARIATIONS
011000* -- Coal
Lignite
& Peat-- Reserves
Geology
& Exploration
CARBONATE ROCKS
CARBONIFEROUS PERIOD
COAL DEPOSITS
COAL SEAMS
DEPOSITION
DEPTH
DIMENSIONS
FEDERAL REGION V
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
ILLINOIS BASIN
INDIANA
MINERAL RESOURCES
NORTH AMERICA
PALEOZOIC ERA
REEFS
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
THICKNESS
USA
VARIATIONS