Magnetostratigraphic dating: Insights to Late Cenozoic deposition and dolomitization of Little Bahama Bank
Conference
·
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
OSTI ID:7259908
- Univ. of Miami, FL (United States)
- Koninklijke/Shell Exploratie en Productie Laboratorium, Rijswijk (Netherlands)
Magnetostratigraphic dating of a transect of cores across Little Bahama Bank (LBB) provides refined insight into timing and anatomy of platform deposition since late Miocene. Age-dating of four cores, with biostratigraphic tie-points, shows a gently northward dipping platform from late Miocene to about mid-Pleistocene (0.73 Ma) as a result of higher growth/accumulation of the southwestern platform margin. Magnetostratigraphic dating coupled with Sr-isotope ages from LBB dolomites significantly improves the late Cenozoic depositional/diagenetic framework. Dolomitization episodes at about 2.2-3.4 and 1.6 Ma correspond with a prolonged period of subaerial exposure and formation of large aquifer systems and perhaps providing a mechanism to pump dolomitizing fluids (seawater) through the platform. A distinct northward slope of the dolomite may be explained by either: (1) a northward-dipping platform top, which supported different aquifer levels during fluctuating sea level lowstand events, or (2) the thickness of the freshwater lens which in turn is controlled by differences in permeability and platform slope between the northern and southern margins.
- OSTI ID:
- 7259908
- Report Number(s):
- CONF-910403--
- Conference Information:
- Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 75:3
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Interpretation of Cenozoic dolomitization in the Bahamas using Sr-87/Sr-86 ratios
Use of strontium isotopes to constrain the timing and mode of dolomitization of upper Cenozoic sediments in a core from San Salvador, Bahamas
Conference
·
Tue May 01 00:00:00 EDT 1990
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
·
OSTI ID:6676552
Interpretation of Cenozoic dolomitization in the Bahamas using Sr-87/Sr-86 ratios
Conference
·
Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:6170092
Use of strontium isotopes to constrain the timing and mode of dolomitization of upper Cenozoic sediments in a core from San Salvador, Bahamas
Journal Article
·
Sat Feb 28 23:00:00 EST 1987
· Geology; (United States)
·
OSTI ID:5237476
Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
AGE ESTIMATION
BAHAMA ISLANDS
BIOLOGICAL MARKERS
CARBONATE ROCKS
CENOZOIC ERA
DEPOSITION
DEVELOPING COUNTRIES
DIAGENESIS
DRILL CORES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGY
ISLANDS
LIMESTONE
MAGNETISM
MIOCENE EPOCH
PALEOMAGNETISM
PALEONTOLOGY
ROCKS
SEDIMENTARY ROCKS
STRATIGRAPHY
TERTIARY PERIOD
WEST INDIES
580000* -- Geosciences
AGE ESTIMATION
BAHAMA ISLANDS
BIOLOGICAL MARKERS
CARBONATE ROCKS
CENOZOIC ERA
DEPOSITION
DEVELOPING COUNTRIES
DIAGENESIS
DRILL CORES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGY
ISLANDS
LIMESTONE
MAGNETISM
MIOCENE EPOCH
PALEOMAGNETISM
PALEONTOLOGY
ROCKS
SEDIMENTARY ROCKS
STRATIGRAPHY
TERTIARY PERIOD
WEST INDIES