Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Paleoaquifer and deep burial related cements defined by regional cathodoluminescent patterns, Middle Ordovician Carbonates, Virginia/sup 1/

Journal Article · · AAPG Bull.; (United States)
OSTI ID:5236228
;
Middle Ordovician ramp carbonates, Virginia, were deposited in a subsiding, foreland basin bordered on the southeast by tectonic highlands. Ramp carbonates were lithified, in part, by turbid marine cements, but major cementation was by nonferroan, clear rim, and equant cements. Zoned (defined by cathodoluminescence) clear cements consist of nonluminescent (oldest), bright, and dull (youngest) cements; the zonation relates to increasingly reducing conditions of pore waters. Zoned cements in peritidal beds, best developed in southeastern belts, have complex zonations, pendant to pore-rimming fabrics, and are associated with crystal silt (which abuts all cement zones), solutional cavities, and erosional surfaces (which locally truncate dull cement). These cements are meteoric vadose to shallow phreatic. Cements in northwestern exposures of peritidal beds are dominated by nonzoned, dull cement which lacks abundant evidence of early, near-surface precipitation. Major cementation of subtidal facies occurred under burial conditions. Burial cements, best developed in southeastern belts, have a simple zonation reflecting progressive burial (up to 7.5 km; 4.5 mi) of the carbonate ramp. Shallow burial nonluminescent cement formed from oxidizing, meteoric waters which expelled anoxic, connate marine waters.
Research Organization:
Virginia Polytechnic and State Univ., Blacksburg, VA
OSTI ID:
5236228
Journal Information:
AAPG Bull.; (United States), Journal Name: AAPG Bull.; (United States) Vol. 67:8; ISSN AABUD
Country of Publication:
United States
Language:
English

Similar Records

Petrography, geochemistry, and origin of burial diagenetic facies, Siluro-Devonian Helderberg Group (carbonate rocks), central Appalachians
Journal Article · Fri May 01 00:00:00 EDT 1987 · AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) · OSTI ID:6455626
Cement stratigragraphy of the Wahoo Formation, Sadlerochit Mountains, Alaska
Conference · Tue May 01 00:00:00 EDT 1990 · AAPG Bulletin (American Association of Petroleum Geologists); (USA) · OSTI ID:6720597
Cement stratigraphy of the Lisburne Group, northeastern Brooks Range, Alaska
Conference · Tue Dec 31 23:00:00 EST 1991 · Geological Society of America, Abstracts with Programs; (United States) · OSTI ID:6063380

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
AQUIFERS
BUILDING MATERIALS
CARBONATE ROCKS
CATHODOLUMINESCENCE
CEMENTS
CONNATE WATER
FEDERAL REGION III
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
GROUND WATER
HYDROGEN COMPOUNDS
INTERSTITIAL WATER
LUMINESCENCE
MATERIALS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NORTH AMERICA
ORDOVICIAN PERIOD
OXYGEN COMPOUNDS
PALEOZOIC ERA
PETROGRAPHY
PETROLEUM DEPOSITS
PETROLEUM GEOLOGY
RESOURCES
ROCKS
SEDIMENTARY ROCKS
USA
VIRGINIA
WATER