Miocene to Pleistocene deep-water benthic foraminifera from D.S.D.P. sites 587 to 589 (Lord Howe Rise), South West Pacific Ocean; taxonomy and paleoecology

Author(s): Reddy, Udumala Balapratap
Source: Institution: Carleton University, Ottawa, ON, Canada
Note: In English. Master's thesis
Summary: The primary emphasis of this thesis is the taxonomic evaluation of deep-water benthic foraminifera. The taxonomic position of some important species is updated according to the revised classification of Loeblich and Tappan,1987. Thirty-nine Early Miocene to Pleistocene sediment samples from the Deep Sea Drilling Project, Leg 90, sites 587 to 589, located on the Lord Howe Rise, South West Pacific Ocean were investigated for foraminifera. Planktonic foraminifera were used to erect a biostratigraphic framework into which 5 benthic foraminiferal assemblages were integrated. One hundred and eighty species of deep-water benthic foraminifera were identified. Eighteen isobathyal species indicate mid- to lower bathyal depths throughout the interval. The faunal diversity is high. Assemblage No. 1, Early Miocene, indicates the bottom water mass characteristics of 7 to 8°C, normal salinity and 0.5 to 3ml/L oxygen, in a relatively thermally unstratified ocean. Assemblage No. 2, Middle Miocene, indicates the bottom water mass to have been 2 to 3°C with high oxygen content in a thermally stratified ocean. Assemblage No. 3, Late Miocene, indicates similar water mass characteristies to those of the Middle Miocene assemblage. Assemblage No. 4, Pliocene, indicates a relatively less cold bottom water mass than the Miocene assemblages. Assemblage No. 5, Pleistocene, is divided into two sub-assemblages which indicate interglacial and glacial episodes. The interglacial sub-assemblage indicates bottom water of 4 to 8°C and the glacial sub-assemblage indicates 2 to 3°C bottom water temperature.
Year of Publication: 1989
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Benthic taxa; Biostratigraphy; Cenozoic; DSDP Site 587; DSDP Site 588; DSDP site 589; Deep Sea Drilling Project; Foraminifera; IPOD; Invertebrata; Leg 90; Lord Howe Rise; Microfossils; Neogene; Pacific Ocean; Paleo-oceanography; Paleoecology; Pleistocene; Protista; Quaternary; South Pacific; Southwest Pacific; Stratigraphy; Tertiary; West Pacific
Coordinates: S211153 S211152 E1612000 E1611959
S260642 S260642 E1611336 E1611336
Record ID: 1992060486
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.