The paleomagnetism of clastic and precipitate deposits in limestone and dolomite caves
- Liverpool Univ. (United Kingdom)
- McMaster Univ., Hamilton, Ontario (Canada)
Clastic sediments and calcite precipitates (stalagmites, flowstones, etc.) are abundant in modern limestone caves and normally are the dominant infillings in buried (paleokarst) caves. Clastic sediment fillings are chiefly of fluviatile or local breakdown origin, but lacustrine, colluvial, eolian, and glacial deposits are known. Paleomagnetism has been studied in the fluviatile and lacustrine types: (1) reversal stratigraphy aids dating of geomorphic and paleoclimatic events in the late Pliocene/Pleistocene; (2) fine magnetostratigraphy has yielded estimates of the westward drift. Calcite precipitates (speleothems) may display natural remanent magnetism of either depositional (DRM) or chemical (CRM) origin. NRMs of modern speleothems are primary, not diagenetic; CRMs are invariably associated with the degradation of surface organic matter. (1) Coarse reversal stratigraphy dates geomorphic, etc., events and erosion rates. (2) Fine stratigraphy combined with {sup 230}Th:{sup 234}U dating gives high precision estimates of secular variation, westward drift, and rate of change of geomagnetic anomalies in upper Pleistocene and Holocene deposits. Magnetostratigraphy of paleokarst speleothem fillings associated with hydrocarbons in Ordovician limestones suggest a Permian age for the karstification. Potential applications of magnetostratigraphy to paleokarst deposits of many different scales are considerable.
- OSTI ID:
- 7259405
- Report Number(s):
- CONF-910403-; CODEN: AABUD
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:3; Conference: Annual meeting of the American Association of Petroleum Geologists (AAPG), Dallas, TX (United States), 7-10 Apr 1991; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
Similar Records
Paleokarstic and karstic features: Arbuckle and Hunton Groups, Oklahoma
Early Cretaceous stratigraphy, paleontology, and sedimentary tectonics in Paris overthrust foredeep (western Wyoming and southeastern Idaho) compared with Quaternary features of indo-gangetic plain
Related Subjects
02 PETROLEUM
LIMESTONE
AGE ESTIMATION
PALEOMAGNETISM
PETROLEUM DEPOSITS
RESERVOIR ROCK
CALCITE
CAVES
DOLOMITE
EXPLORATION
GEOLOGIC HISTORY
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MINERALIZATION
PALEOCLIMATOLOGY
PLATE TECTONICS
PRECIPITATION
QUATERNARY PERIOD
SEA-FLOOR SPREADING
STRATIGRAPHY
CARBONATE MINERALS
CARBONATE ROCKS
CAVITIES
CENOZOIC ERA
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
MAGNETISM
MATERIALS
MINERAL RESOURCES
MINERALS
PALEONTOLOGY
PHYSICAL PROPERTIES
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
TECTONICS
580000* - Geosciences
020200 - Petroleum- Reserves
Geology
& Exploration