Aptian-Albian planktic Foraminifera from DSDP Site 364 (offshore Angola); biostratigraphy, paleoecology, and paleoceanographic significance

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doi: 10.2113/gsjfr.43.4.443
Author(s): Kochhann, Karlos G. D.; Koutsoukos, Eduardo A. M.; Fauth, Gerson; Sial, Alcides N.
Author Affiliation(s): Primary:
Universidade do Vale do Rio dos Sinos, Instituto Tecnológico de Micropaleontologia, Sao Leopoldo, Brazil
Universität Heidelberg, Germany
Universidade Federal de Pernambuco, Brazil
Volume Title: Journal of Foraminiferal Research
Source: Journal of Foraminiferal Research, 43(4), p.443-463. Publisher: Cushman Foundation for Foraminiferal Research, Ithaca, NY, United States. ISSN: 0096-1191 CODEN: JFARAH
Note: In English. 104 refs.; illus., incl. 2 tables
Summary: This work presents a taxonomic, biostratigraphic and paleoecological study of planktic foraminifera recovered from the Aptian-Albian carbonate-dominated succession of Deep Sea Drilling Project (DSDP) Site 364, located in the Kwanza Basin (offshore Angola). Twenty-nine planktic foraminiferal species were identified, enabling the identification of late Aptian-late Albian biozones, from the Hedbergella trocoidea Zone to the Pseudothalmanninella ticinensis Zone. A major unconformity from the latest early-earliest late Albian was identified in core 31, with the Microhedbergella rischi Zone in direct contact with the Pseudothalmanninella ticinensis Zone. The recovered assemblages are characterized by open marine epipelagic dwellers and indicate predominant mesotrophic environmental conditions throughout the studied stratigraphic succession. Aptian planktic foraminiferal assemblages have a tropical/subtropical paleobiogeographic affinity, supporting a surface-water connection between the central proto-Atlantic Ocean and the northern South Atlantic Ocean (north of the Walvis Ridge-Rio Grande Rise) by the late Aptian. Trends in isotopic values for δ13C suggest a late Aptian age (Globigerinelloides algerianus Zone) for the stratigraphic interval from core 42 to approximately core 37, where age-diagnostic foraminiferal species are missing. Black shale levels in cores 42-39 are probably the local expression of the "late Aptian anoxic event."
Year of Publication: 2013
Research Program: DSDP Deep Sea Drilling Project
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Africa; Albian; Angola; Angola Basin; Aptian; Assemblages; Atlantic Ocean; Biostratigraphy; Biozones; C-13/C-12; Carbon; Central Africa; Chemostratigraphy; Cretaceous; Cuanza Basin; DSDP Site 364; Deep Sea Drilling Project; Foraminifera; Invertebrata; Isotope ratios; Isotopes; Leg 40; Lower Cretaceous; Marine environment; Mesozoic; Microfossils; Morphology; O-18/O-16; Oxygen; Paleo-oceanography; Paleoecology; Paleoenvironment; Planktonic taxa; Protista; SEM data; South Atlantic; Stable isotopes; Taxonomy
Coordinates: S113419 S113419 E0115818 E0115818
Record ID: 2013088922
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Cushman Foundation for Foraminiferal Research, Reference includes data from GeoScienceWorld, Alexandria, VA, United States