Isotope geochemistry of crinoids from Burlington-Keokuk Formations: implications for diagenesis
Conference
·
· Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6611154
Petrographic studies suggest that early calcite cements are present within the intraskeletal pores of crinoids from the Mississippian Burlington-Keokuk Fms. of Illinois, Iowa, and Missouri. Procedures have been developed for analyzing the Sr isotope ratio, Sr and Rb abundances, and C and O isotope values for sample sizes of 2 mg or less. Drilled crinoids have Sr that is more radiogenic (0.70810-0.70845) than Mississippian sea water (0.7076), but generally less radiogenic than whole rock samples (0.7080-0.7089), drilled apatites (0.70880), plucked crinoid grains (0.7085-0.7090), drilled micrite (0.70853-0.71255), or late vug saddle dolomite (0.70967) and calcite (0.70890). Shale layers within the Keokuk Fm. have initial Sr of 0.708 to 0.714. Mass balance considerations suggest that these shales cannot be the primary source of the radiogenic Sr. The variations in C and Sr may reflect various extents of interaction with regional ground waters or brines. The micrite and apatite were apparently more strongly affected by later fluids than were the coexisting calcite cements within the crinoids.
- Research Organization:
- State Univ. of New York, Stony Brook (USA)
- OSTI ID:
- 6611154
- 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
Similar Records
Petrography and C and O isotope geochemistry of crinoids, Burlington-Keokuk Formation, southeastern Iowa and Western Illinois
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Conference
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Thu Dec 31 23:00:00 EST 1987
·
OSTI ID:6339343
Carbonate petrography of the Burlington/Keokuk contact in southeastern Iowa
Conference
·
Sun Jan 31 23:00:00 EST 1993
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:6002231
Paleokarstic features and their relationship to cementation history, Burlington-Keokuk Limestone, middle Mississippian, central Missouri
Conference
·
Thu May 01 00:00:00 EDT 1986
· Am. Assoc. Pet. Geol., Bull.; (United States)
·
OSTI ID:5378267
Related Subjects
58 GEOSCIENCES
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
580400* -- Geochemistry-- (-1989)
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METAL COMPOUNDS
ANIMALS
BUILDING MATERIALS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON ISOTOPES
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CEMENTS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
CORRELATIONS
DIAGENESIS
FEDERAL REGION V
FEDERAL REGION VII
FOSSILS
GEOCHEMISTRY
GEOLOGIC FORMATIONS
GROUND WATER
HYDROGEN COMPOUNDS
ILLINOIS
INVERTEBRATES
IOWA
ISOTOPE RATIO
ISOTOPES
LITHOLOGY
MATERIALS
MINERALS
MISSOURI
NORTH AMERICA
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PETROGRAPHY
POROSITY
QUANTITATIVE CHEMICAL ANALYSIS
ROCK-FLUID INTERACTIONS
ROCKS
SEDIMENTARY ROCKS
STRONTIUM ISOTOPES
USA
WATER
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
580400* -- Geochemistry-- (-1989)
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METAL COMPOUNDS
ANIMALS
BUILDING MATERIALS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON ISOTOPES
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CEMENTS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
CORRELATIONS
DIAGENESIS
FEDERAL REGION V
FEDERAL REGION VII
FOSSILS
GEOCHEMISTRY
GEOLOGIC FORMATIONS
GROUND WATER
HYDROGEN COMPOUNDS
ILLINOIS
INVERTEBRATES
IOWA
ISOTOPE RATIO
ISOTOPES
LITHOLOGY
MATERIALS
MINERALS
MISSOURI
NORTH AMERICA
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PETROGRAPHY
POROSITY
QUANTITATIVE CHEMICAL ANALYSIS
ROCK-FLUID INTERACTIONS
ROCKS
SEDIMENTARY ROCKS
STRONTIUM ISOTOPES
USA
WATER