Mineralogy of the Mahogany marker tuff of the Green River Formation, Piceance Creek Basin, Colorado
Conference
·
· Oil Shale Symp. Proc.; (United States)
OSTI ID:5167184
The Mahogany marker tuff is a chronostratigraphic marker which was deposited in Eocene Lake Uinta approximately 45-46 million years ago when the lake was at its maximum size. The Mahogany marker lies 3 to 6 meters above the Mahogany oil shale bed in the upper part of the Parachute Creek Member of the Green River Formation. The mineralogy of the marker was studied in drill cores by X-ray diffraction and hand specimen examination. The Mahogany marker consists of authigenic sodium feldspar, analcime, quartz, ankerite, dolomite, potassium, feldspar, calcite with lesser amounts of siderite, hematite, pyrite, undifferentiated clays, pyrrhotite, biotite, marcasite, and locally dawsonite. Analcime is not present in all samples and in samples which are analcime-free, K-feldspar shows a greater abundance. Dawsonite is locally present only in analcime-free samples. The presence or absence of analcime and K-feldspar is attributed to the geochemical conditions that existed in the lake at the time of deposition of the Mahogany marker. The evidence supports a stratified lake model of oil shale deposition, with extremely alkaline pH values existing in deeper central portions of Lake Uinta.
- OSTI ID:
- 5167184
- Report Number(s):
- CONF-830434-
- Conference Information:
- Journal Name: Oil Shale Symp. Proc.; (United States)
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Journal Article
·
Sun Oct 01 00:00:00 EDT 1978
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·
OSTI ID:6723408
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Conference
·
Fri May 01 00:00:00 EDT 1987
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
·
OSTI ID:6135935
Mineralogy and geochemistry of Green River Formation Oil Shales, C-A Tract, Colorado
Conference
·
Thu Mar 31 23:00:00 EST 1983
· Oil Shale Symp. Proc.; (United States)
·
OSTI ID:5197450
Related Subjects
04 OIL SHALES AND TAR SANDS
040201* -- Oil Shales & Tar Sands-- Site Geology-- (-1989)
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMISTRY
COHERENT SCATTERING
COLORADO
DIFFRACTION
DRILL CORES
ENERGY SOURCES
FEDERAL REGION VIII
FOSSIL FUELS
FUELS
GEOCHEMISTRY
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
GEOLOGY
GREEN RIVER FORMATION
MAHOGANY ZONE
MATERIALS
MINERAL RESOURCES
MINERALOGY
MINERALS
NORTH AMERICA
OIL SHALE DEPOSITS
OIL SHALES
PICEANCE CREEK BASIN
QUALITATIVE CHEMICAL ANALYSIS
RESOURCES
SCATTERING
STRATIGRAPHY
USA
X-RAY DIFFRACTION
040201* -- Oil Shales & Tar Sands-- Site Geology-- (-1989)
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMISTRY
COHERENT SCATTERING
COLORADO
DIFFRACTION
DRILL CORES
ENERGY SOURCES
FEDERAL REGION VIII
FOSSIL FUELS
FUELS
GEOCHEMISTRY
GEOLOGIC DEPOSITS
GEOLOGIC MODELS
GEOLOGY
GREEN RIVER FORMATION
MAHOGANY ZONE
MATERIALS
MINERAL RESOURCES
MINERALOGY
MINERALS
NORTH AMERICA
OIL SHALE DEPOSITS
OIL SHALES
PICEANCE CREEK BASIN
QUALITATIVE CHEMICAL ANALYSIS
RESOURCES
SCATTERING
STRATIGRAPHY
USA
X-RAY DIFFRACTION