Uppermost Jurassic to Lower Cretaceous Deep-Water Benthic Foraminiferal Assemblages from Site 765 on the Argo Abyssal Plain.

Kaminski, Michael A., Gradstein, Felix M. and Geroch, Stanislaw (1992) Uppermost Jurassic to Lower Cretaceous Deep-Water Benthic Foraminiferal Assemblages from Site 765 on the Argo Abyssal Plain. Open Access Proceedings of the Ocean Drilling Program: Scientific Results, 123 . pp. 239-269. DOI 10.2973/odp.proc.sr.123.126.1992.

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Abstract

Benthic foraminifers were studied in 99 samples collected from the lower 200 m of Hole 765C. The studied section ranges from the Tithonian to Aptian, and benthic foraminifers can be subdivided into five assemblages on the basis of faunal diversity and stratigraphic ranges of distinctive species. Compared with deep-water assemblages from Atlantic DSDP sites and Poland, assemblages from the Argo Abyssal Plain display a higher diversity of agglutinated forms, which comprise the autochthonous assemblages. Assemblages at the base of Hole 765C are wholly composed of agglutinated forms, reflecting deposition beneath the carbonate compensation depth (CCD). Most calcareous benthic species are found in turbidite layers, and the presence of an upper Valanginian Praedorothia praehauteriviana Assemblage may indicate deposition at or just below the CCD. The P. praehauteriviana Assemblage from Hole 765C is the temporal equivalent of similar assemblages from DSDP Holes 534A, 416A, 370, 105, and 101 in the Atlantic Ocean and Hole 306 in the Pacific Ocean. Stratigraphic ranges of cosmopolitan agglutinated species at Site 765 generally overlap with their reported ranges in the Atlantic and in the bathyal flysch sequences of the Carpathians; however, several species from Hole 765C have not been previously reported from Uppermost Jurassic to Lower Cretaceous abyssal sediments.

Document Type: Article
Keywords: Deep-water, benthic foraminifera, Argo Abyssal Plain, Jurassic, Cretaceous
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.2973/odp.proc.sr.123.126.1992
ISSN: 1096-7451
Projects: ODP
Date Deposited: 22 May 2019 11:42
Last Modified: 22 May 2019 11:42
URI: http://oceanrep.geomar.de/id/eprint/46783

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