Paleomagnetic dating of dedolomitization in Cambrian-Ordovician Arbuckle Group limestones and Pennsylvanian Collings Ranch Conglomerate, southern Oklahoma
Paleomagnetic and petrographic techniques have been used to date dedolomitization in stratigraphic and tectonic dolomites exposed in the Arbuckle Mountains, southern Oklahoma. The authors examined red dedolomites and their dolomite precursors from the Cambrian-Ordovician Arbuckle Group and dolomite clasts in the Pennsylvanian Collings Ranch Conglomerate. Authigenic hematite is associated with the dedolomite and precipitated as a result of the dedolomitization process. Dedolomite is associated with paleokarst and fractures, burrows, Liesegang bands, and red rims on conglomerate clasts. Magnetic directions from these dedolomitized rocks range from Dec = 145/sup 0/ to 154/sup 0/ and Inc = 2/sup 0/ to 9/sup 0/, with ks greater than 50 and /alpha/95s less than 5. The directions are constrained by fold tests to be post-structural (Late Pennsylvanian to Early Permian) and in the Collings Ranch to post-depositional. These directions correspond to a reversed Pennsylvanian pole position and the magnetizations are interpreted as chemical remanent magnetizations (CRM) acquired when hematite precipitated during dedolomitization.
- OSTI ID:
- 5992071
- Report Number(s):
- CONF-880301-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
AGE ESTIMATION
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CAMBRIAN PERIOD
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
CHEMISTRY
DATA
DIAGENESIS
DISSOLUTION
DOLOMITE
EXPERIMENTAL DATA
FEDERAL REGION VI
GEOCHEMISTRY
GEOLOGIC AGES
INFORMATION
IRON COMPOUNDS
IRON ORES
IRON OXIDES
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MAGNETISM
MAGNETITE
MINERALS
NORTH AMERICA
NUMERICAL DATA
OKLAHOMA
ORDOVICIAN PERIOD
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALEOMAGNETISM
PALEOZOIC ERA
PENNSYLVANIAN PERIOD
PETROGRAPHY
TRANSITION ELEMENT COMPOUNDS
USA