Planktonic foraminifera abundance and stratigraphy of ODP Leg 162 sites

During Ocean Drilling Program (ODP) Leg 162, five sites were drilled in the subpolar North Atlantic (Sites 980-984), three sites in the Nordic Seas (Sites 985-987), and two holes at Iceland Sea Site 907 (first drilled during ODP Leg 151). Carbonate sediments at the subpolar sites have generally comm...

Full description

Bibliographic Details
Main Author: Flower, Benjamin P
Format: Other/Unknown Material
Language:English
Published: PANGAEA 1999
Subjects:
Ocean Drilling Program
ODP
Iceland
Neogloboquadrina pachyderma
Nordic Seas
North Atlantic
Planktonic foraminifera
Svalbard
Svalbard margin
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.804907
https://doi.org/10.1594/PANGAEA.804907
Description
Summary:During Ocean Drilling Program (ODP) Leg 162, five sites were drilled in the subpolar North Atlantic (Sites 980-984), three sites in the Nordic Seas (Sites 985-987), and two holes at Iceland Sea Site 907 (first drilled during ODP Leg 151). Carbonate sediments at the subpolar sites have generally common to abundant and well-preserved planktonic foraminifers, especially at Feni Drift Sites 980/981 and Rockall Plateau Site 982. Gardar Drift Site 983 and Bjorn Drift Site 984 featured greater concentrations of clay material and ice-rafted debris, diluting carbonate material in some intervals (particularly before ~1.8 Ma at Site 984). Nordic Seas Sites 907 and 985-987 feature generally rare to common and moderately well-preserved planktonic foraminifers only within the past 1 m.y., although Pliocene taxa are sparsely recorded at Site 986 on the Svalbard margin. Planktonic foraminifer datum levels are located to the section level where possible for the subpolar North Atlantic sites. Comparison to an integrated magnetostratigraphy and calcareous nannofossil stratigraphy shows that several datum levels are synchronous to within 5% of their published ages. In particular, the start of the Neogloboquadrina pachyderma (sinistral) Acme Zone (1.8 Ma), the first occurrence (FO) of Globorotalia inflata (2.09 Ma), the last occurrence (LO) of Globorotalia cf. crassula (3.3 Ma), and the FO of Globorotalia puncticulata (4.5 Ma) are judged synchronous in eastern sections of the subpolar North Atlantic. The LO of Neogloboquadrina atlantica (sinistral) occurs ~100-200 k.y. later relative to its mid-latitude North Atlantic age (2.41 Ma).

Similar Items