High-resolution stable isotope and microfossil record from the Gulf of Mexico
Conference
·
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
OSTI ID:5739132
- Unocal, Houston, TX (United States)
- Unocal, Brea, CA (United States)
ODP Site 625B was hydraulically piston cored in the northeastern Gulf of Mexico providing an apparently complete sedimentary record for the last 5.35 my. A high-resolution chronology was derived by tuning the oxygen isotope record to variations in orbital obliquity. Ages for calcareous nannofossil and planktonic foraminiferal datums were determined. Eight of the 11 nannofossil last appearances occur during glacials or during the onset of glacial periods. Of the eight foraminiferal last appearances, half occur during glacials. Results from open-ocean records also show a preponderance of last appearances within glacial intervals for the last 2.5 my. The higher frequency of last appearances during glacial intervals may result from greater environmental stress. Late Pliocene (2.30-1.66 Ma) and early Pleistocene (1.66-0.73 Ma) oxygen isotope anomalies with magnitudes of {minus}1.4 to {minus}2.0{per thousand} indicate glacial meltwater discharge from the Mississippi River implying that an ice sheet has been present at midlatitudes in North America periodically since 2.3 Ma.
- OSTI ID:
- 5739132
- 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
Pliocene paleo-oceanographic perturbations and ecosystem response: implications for planktonic foraminiferal datums
Foraminiferal and calcareous nannofossil paleoecology across the Cenomanian/Turonian boundary in the western interior of North America
Isotope chronostratigraphy: high-resolution stratigraphic correlations in deep-water exploration tracts of northern Gulf of Mexico
Conference
·
Tue Feb 28 23:00:00 EST 1989
· AAPG Bull.; (United States)
·
OSTI ID:6018194
Foraminiferal and calcareous nannofossil paleoecology across the Cenomanian/Turonian boundary in the western interior of North America
Conference
·
Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:6874418
Isotope chronostratigraphy: high-resolution stratigraphic correlations in deep-water exploration tracts of northern Gulf of Mexico
Conference
·
Tue Sep 01 00:00:00 EDT 1987
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
·
OSTI ID:5907575
Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
AGE ESTIMATION
ANIMALS
AQUATIC ORGANISMS
ATLANTIC OCEAN
CARIBBEAN SEA
CHEMISTRY
DRILL CORES
FORAMINIFERA
FOSSILS
GEOCHEMISTRY
GEOLOGIC DEPOSITS
GEOLOGY
GULF OF MEXICO
INVERTEBRATES
ISOTOPE RATIO
ISOTOPES
MICROORGANISMS
OXYGEN ISOTOPES
PALEOCLIMATOLOGY
PALEONTOLOGY
PLANKTON
PROTOZOA
SARCODINA
SEAS
SEDIMENTS
STRATIGRAPHY
SURFACE WATERS
580000* -- Geosciences
AGE ESTIMATION
ANIMALS
AQUATIC ORGANISMS
ATLANTIC OCEAN
CARIBBEAN SEA
CHEMISTRY
DRILL CORES
FORAMINIFERA
FOSSILS
GEOCHEMISTRY
GEOLOGIC DEPOSITS
GEOLOGY
GULF OF MEXICO
INVERTEBRATES
ISOTOPE RATIO
ISOTOPES
MICROORGANISMS
OXYGEN ISOTOPES
PALEOCLIMATOLOGY
PALEONTOLOGY
PLANKTON
PROTOZOA
SARCODINA
SEAS
SEDIMENTS
STRATIGRAPHY
SURFACE WATERS