UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Neogene and quaternary planktonic foraminifer biostratigraphy and biochronology in Baffin Bay and the Labrador Sea

Aksu, A.E.; Kaminski, M.A.; (1989) Neogene and quaternary planktonic foraminifer biostratigraphy and biochronology in Baffin Bay and the Labrador Sea. Proceedings of the Ocean Drilling Program: Scientific Results , 105 pp. 287-304. 10.2973/odp.proc.sr.105.122.1989. Green open access

[img]
Preview
PDF
18296.pdf

Download (3MB)

Abstract

During Ocean Drilling Program Leg 105, 11 holes were drilled in the Labrador Sea and Baffin Bay. Site 645 in Baffin Bay was drilled to a depth of 1147 meters below seafloor (mbsf); planktonic foraminifers were recovered in the upper 110.3 m and in a short interval between 283.8 and 293.5 mbsf. Low species diversity and the lack of species with short stratigraphic ranges inhibited establishment of a planktonic foraminifer biostratigraphic framework at Site 645. Holes 646B and 647A in the Labrador Sea were drilled to depths of 766.7 and 716.6 mbsf, respectively. Although the observed assemblages in the Labrador Sea holes were of low diversity, the first and last occurrences of several age-diagnostic species, when integrated with paleomagnetic stratigraphy, allowed the establishment of a high-latitude Miocene to Holocene planktonic foraminifer biochronology. To determine the relative timing of planktonic foraminifer datum events in the eastern North Atlantic and the Labrador Sea, this biochronology is compared with the temperate-subpolar biozonation of Weaver and Clement (1986). The late Miocene dextral-to-sinistral coiling change in Neogloboquadrina atlantica was observed — 1.6 m.y. earlier at Site 646 than at any other site in the Atlantic. The first appearance datums (FAD) of Globorotalia margaritae, Globorotalia puncticulata, Globorotalia irtflata, and the last appearance datum (LAD) of N. atlantica are isochronous with their reported ages in the eastern North Atlantic, but the FADs of Globorotalia truncatulinoides and the modern, encrusted form of Neogloboquadrina pachyderma are diachronous.

Type: Article
Title: Neogene and quaternary planktonic foraminifer biostratigraphy and biochronology in Baffin Bay and the Labrador Sea
Open access status: An open access version is available from UCL Discovery
DOI: 10.2973/odp.proc.sr.105.122.1989
Publisher version: http://dx.doi.org/10.2973/odp.proc.sr.105.1989
Language: English
Additional information: Issue entitled: Baffin Bay and Labrador Sea, covering Leg 105 of the cruises of the Drilling Vessel JOIDES Resolution, St. John's, Newfoundland, to St. John's, Newfoundland, Sites 645-647, 23 August 1985-27 October 1985
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/18296
Downloads since deposit
405Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item