Miocene deep-sea benthic Foraminifera from the Atlantic and Indian oceans; diversity patterns and palaeoceanography

Author(s): Smart, Christopher W.; Murray, John W.
Author Affiliation(s): Primary:
University of Wales, Department of Earth Sciences, Cardiff, United Kingdom
University of Southampton, United Kingdom
Volume Title: Número homenaje al Dr. Guillermo Colom
Volume Author(s): Lamolda, Marcos A., editor
Source: Número homenaje al Dr. Guillermo Colom [Issue to honor Dr. Guillermo Colom], edited by Marcos A. Lamolda. Revista Española de Paleontología, 1995( Homenaje al Dr. Guillermo Colom), p.59-68. Publisher: Sociedad Española de Paleontología, Madrid, Spain. ISSN: 0213-6937
Note: In English with Spanish summary. 36 refs.; illus., incl. 3 tables
Summary: During the early to middle Miocene of the Atlantic and Indian Oceans there were variations in species diversity of the lower bathyal to abyssal plain (3-4.4 km) benthic foraminiferal assemblages although, overall, diversity remained high and comparable with that of the modern environment. The early Miocene was a period of palaeoceanographic change and this has previously been documented both through studies of stable isotopes and the rate of appearances or disappearances of taxa (whether evolutionary or ecological). The diversity oscillations appear to represent shorter period change. The lowest diversities are associated with the peak abundance of bolivinids. Other variations cannot be correlated from one site to another and are thought to represent local environmental changes. During the early-middle Miocene, the diversity of the Atlantic abyssal plain was lower than that of the Indian and Pacific Oceans possibly indicating significant diversity differences between ocean basins. On the basis of limited data, it is possible to speculate that the species diversity of the Miocene was perhaps higher than that of today.
Year of Publication: 1995
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Abyssal plains; Atlantic Ocean; Bathymetry; Benthic taxa; C-13/C-12; Carbon; Cenozoic; DSDP Site 368; DSDP Site 529; Deep Sea Drilling Project; Deep-sea environment; Extinction; Foraminifera; Geochemistry; Habitat; IPOD; Indian Ocean; Invertebrata; Isotope ratios; Isotopes; Leg 108; Leg 121; Leg 41; Leg 74; Marine environment; Microfossils; Miocene; Neogene; O-18/O-16; ODP Site 667; ODP Site 758; Ocean Drilling Program; Ocean floors; Oxygen; Paleo-oceanography; Paleoecology; Paleoenvironment; Patterns; Protista; Species diversity; Stable isotopes; Tertiary
Coordinates: N173026 N173026 W0212114 W0212114
S285548 S285548 E0024606 E0024606
N043408 N043409 W0215440 W0215441
N052302 N052303 E0902141 E0902140
Record ID: 2007056362
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.