The upper Aptian-Albian succession of the Sergipe basin, Brazil: An integrated paleoenvironmental assessment
- Petroleo Brasileiro S.A., Rio de Janeiro (Brazil)
- Polytechnic South West, Plymouth (England)
- Univ.of Bristol (England)
A combined micropaleontological, geochemical, and sedimentological study of the upper Aptian-Albian succession from the Sergipe basin, northeastern Brazil, has been undertaken. The paleoenvironmental evolution of the basin from the late Aptian to late Albian can be subdivided into three major depositional phases: (1) late Aptian, (2) early to middle Albian; (3) late Albian. A shallow carbonate compensation depth within upper mesopelagic depths (c. 300-500 m) is inferred for the late Aptian-Albian. Intermittent anoxic events, associated with salinity-stratified water masses, occurred in the basin during the late Aptian to Albian. An oxygen minimum (dysaerobic to anoxic conditions) occurred during the late Aptian to earliest Albian, in middle-outer neritic to upper bathyal settings. Waning dysaerobic to oxic conditions are apparent in the late Albian. The foraminiferal assemblages recovered from the upper Aptian marine deposits have a characteristic Tethyan affinity. The microfaunal evidence suggests that this area of the northern South Atlantic had at least some surface water exchange with low-latitude central North Atlantic-western Tethyan Provinces, even possible at intermediate (epipelagic to mesopelagic) water depths. Contribution of microfaunal elements coming from high-latitude northern (Boreal Realm) and/or southern (Austral) regions is also apparent, although of less significance.
- OSTI ID:
- 5694165
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Vol. 75:3; ISSN AABUD; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
Similar Records
Flexural subsidence mechanism for the Late Cretaceous-Paleogene Great Valley basin
Migration of Neogene marine environments, southwestern Dominican Republic
Related Subjects
020200 -- Petroleum-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000* -- Geosciences
ANIMALS
BIOLOGICAL MARKERS
BRAZIL
CHEMISTRY
CRETACEOUS PERIOD
DEVELOPING COUNTRIES
FORAMINIFERA
GEOCHEMICAL SURVEYS
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOLOGY
INVERTEBRATES
LATIN AMERICA
MESOZOIC ERA
MICROORGANISMS
OIL WELLS
PALEONTOLOGY
PETROLEUM GEOLOGY
PROTOZOA
SARCODINA
SEDIMENTARY BASINS
SOUTH AMERICA
STRATIGRAPHY
SURVEYS
WELLS